Bad. A rear main seal leak can cause some big problems in your vehicle. To make things worse, replacing a rear main seal can be one of the most expensive jobs you can do on your car next to replacing the head gaskets or rebuilding your transmission. But what makes a rear main seal leak so bad? In this article, we’ll answer that question and help you identify whether or not you’ve got a rear main seal leak in your vehicle.
What makes a rear main seal leak so bad?
- The leak location
- The type of seal
- The speed of the leak
Leak location
The biggest contributor to the cost of replacing a rear main seal is the location of the seal and therefore the location of the leak. The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. To replace the seal, either the engine or transmission will have to be removed. Once one of those is removed the oil pan also has to come out so it gets to be an expensive job.
The type of seal
Some seals and gasket in your engine never cause large leaks because of the design or because they don’t seal a pressurized portion of the engine. The rear main seal is subject to both high oil pressure since it is right by the rear main bearing as well as the spinning crankshaft which is constantly wearing on the inside of the seal. No matter how often you change your oil, eventually the spinning metal crankshaft will wear down the seal enough to cause a leak.
The speed of the leak
The possibility of a very fast leak is the biggest factor that makes it so dangerous to drive with a rear main seal leak. As we just mentioned, your rear main seal is in a place that gets a lot of oil thrown at it and has the added wear of the crankshaft spinning inside of it. If the seal tears or cracks at all your crankshaft rotation can cause the seal to get torn up very quickly causing a very fast leak. A fast leak can lower your engine oil level to dangerous levels very quickly and dangerously low oil levels can lead to permanent engine damage. For more information on why rear main seal leaks are bad, Join Clark in our garage for a quick explanation!
How Do I Know I Have a Rear Main Seal Leak?
Now that you know how serious a rear main seal leak can be, it’s important to be able to spot one. If you’ve got a rear main seal leak you will have oil dripping off either your engine oil pan or the front of your transmission called the bell housing. The problem is other leaks can cause oil to drip from this location as well. For example, a leaking oil pan gasket or even a leaking valve cover gasket can drip down your engine and cause oil drips in this location. The only way to be sure you’ve got a rear main seal leak is to clean your engine thoroughly, then run your engine and check for the drip that looks like it’s coming out of your transmission bell housing. If your transmission has an inspection plate you can also open that up and check for engine oil on the back of your flywheel or flexplate.
If you’ve discovered a rear main seal leak in your vehicle, seal the leak today before it’s too late. Head to your local auto parts stores and pick up BlueDevil Rear Main Sealer. Simply add BlueDevil Rear Main Sealer to your vehicle’s engine oil and your rear main seal leak will be stopped as your drive your vehicle.
Pick up BlueDevil Rear Main Sealer today at your favorite local auto parts store like:
- AutoZone
- Advance Auto Parts
- Bennett Auto Supply
- CarQuest Auto Parts
- NAPA Auto Parts
- O’Reilly Auto Parts
- Pep Boys
- Fast Track
- Bumper to Bumper Auto Parts Specialists
- S&E Quick Lube Distributor
- DYK Automotive
- Fisher Auto Parts stores
- Auto Plus Auto Parts stores
- Hovis Auto & Truck Supply stores
- Salvo Auto Parts
- Advantage Auto Stores
- Genuine Auto Parts stores
- Bond Auto Parts stores
- Tidewater Fleet Supply
- Bumper to Bumper Auto Parts
- Any Part Auto Parts
- Consumer Auto Parts
Pictures Provided By:
rear_main_seal_leak.jpg By Dreamnikon – Licensed by Getty Images – Original Link
BlueDevil Products can be found on Amazon.com or at AutoZone, Advance Auto Parts, O’Reilly Auto Parts, NAPA, and other major auto parts retailers.
262 responses to "How Bad is a Rear Main Seal Leak?"
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If your main sealer is poured in at the oil change, can it be left in for 3500 miles or does it need to drained when the leak stops? Also, is there a dange of stopping up internal block oil passages?
Sir-
It can be left in for the full 3500 miles (life of the oil). The BlueDevil Rear Main Sealer does not harden or thicken in any way so there is no possibility of clogging or any type of flow restriction when using this product.
Thank You!
-BDP
Have a 2016 Honda C-RV with 3,500 miles 9 month old, changed the oil, filter, air filter while under the auto so oil leaking from the rear main area. Well take it into the shop to see what they say while they are looking a the surging problem. Had a 1998 Ford Ranger with 200,000 mile and 14 yrs of service. NO problems like the new Honda.
Sure hope this is not a sign of what is to come on the Honda.
Oliver-
Thank you for asking about your Honda CR-V. Based on your description, we recommend using the BlueDevil Rear Main Sealer http://store.gobdp.com/rear-main-sealer-00234/. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
How bad of a rear main seal leak will this stuff stop? I have a 85′ ford f 250 with a 460 and it is now going through about a quart of oil about every 30 miles or so. And how long will it fix the problem?
Roger-
Thank you for asking about your Ford F-250. The BlueDevil Rear Main Sealer is intended for leaks that are seeping, or lightly dripping from the rear main seal. Typically, you should expect to see results after about 100-200 miles of driving. If you are losing oil to the extent that you would lose your oil capacity before you got to around 200 miles of driving, unfortunately, you would not be able to keep the product in the system long enough in order to get the benefit of using it. A hard part repair may be your best option.
Thank you!
-BDP
Do i have to add BlueDevil Rear Main Sealer everytime i change my oil
Joey-
You should only need to use the BlueDevil Rear Main Sealer one time. It is not the kind of thing that would needed to be added with every oil change. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I have a rear engine seal leak my mechanic said that the transmission would have to come out and he would have to Remove the front end on my 2003 Chevy suburban, is removing the front end necessary ?
Steve-
Thank you for asking about your Chevy Suburban. Removing the front end when replacing the rear main seal is not typically necessary. The transmission would need to be removed, which in itself, is very time consuming.
Hope this helps!
-BDP
I have a 2016 CRV, 23,000 miles, found out I have rear end main seal leak, I took it for oil change and was leaking so I took it back to the dealer, they had to tear down transmission, the good news it was all covered under warranty. I was just wondering how your car has been since your issues.
So I spent $2,000 on a 04 Honda Accord man told me it was dependable and reliable nothing was wrong with it he could sell it for that price all day long man I have learned a lot anyway when I was going through oil like a lot of oil right from full to empty in like 3 days I got under the car to try to see where it was going I did an oil change cuz I thought maybe the oil filter was leaking no I thought maybe around the oil pan was leaking no but there is so much oil under that car it’s like blowback I mean you can see it’s like the wind catches it and it blows it back all under the undercarriage of the car that’s how bad it is I’m guessing it remains seal I’ve never crawled under a car to look at it before I bought it but that’s in the past I learned a lesson that day the hard way do you have any idea what this could be is it the rear main seal
Delsie-
Unfortunately, it would be difficult to say where the leak is coming from. Based on your description, and how quickly you are losing oil, it may be best to have the vehicle looked at by a mechanic. You could also try cleaning the undercarriage and try and reevaluate where the leak may be coming from.
Hope this helps!
-BDP
I have oil leak on my 2009 jeep grand cherokee I’m 75% sure it’s a rear main seal. Would you suggest rear mail and no leaks products?
Nathan-
Thank you for asking about your Jeep Grand Cherokee. We recommend using the BlueDevil Oil Stop Leak, based on your description. Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
Thank you!
-BDP
I added one bottle and it slowed the leak to a very low minimum can I add a second bottle to seal it all the way?
Christopher-
If you’ve noticed improvement but still have somewhat of a leak, a second application would be recommended. Feel free to contact our technical support line at 888-863-0426 for further assistance.
Thank you!
-BDP
thanksfor the info. will try it.
I have a 98 infinity qx4 that has a rear main leak. Can i pour your sealer in without waiting til the next oil change?
Vee-
Thank you for asking about your Infinity QX4. Yes, you are fine to add the product to your existing oil. Typically, you will stat to see improvement after about 100-200 miles of driving. The product can stay in the oil for the life of the oil, so it does not need to be changed out immediately after proper results are achieved.
Thank you!
-BDP
Can i pour it in now with out oil change
Johnnie-
As long as you are not due for an oil change in the next 300 miles or so, you can add the product into your existing oil. Feel free to contact our technical support team at 888-863-0426 with any other questions.
Thank you!
-BDP
Hello I added rear main sealer in my 96 Dodge Ram 1500 only noticed small leak couple drops on drive way maybe for past few months leaked maybe half quart oil but blue devil in and still leaking?
Micki-
Thank you for asking about your Dodge Ram 1500. Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.
Thank you!
-BDP
I have a 2004 gmc z71 my rear main seal leaks some drops everytime i park it but i put in maybe half a qt every 2 months you think this additive stop the leaking
Greg-
Thank you for asking about your GMC. Based on your description, you would be a great candidate for the BlueDevil Rear Main Sealer. You should expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
How many times could i use blue devil rear seel ant .😀
Vincent-
You should only have to apply BlueDevil Rear Main Sealer 1 time. It is not necessary to keep adding it.
Thank you!
-BDP
I have a 2009 Chevy Silverado I knew I had a small oil leak around bell housing and motor it was recommended by mechanic to use blue devil rear main seal I noticed while driving my oil pressure decreased no alarms or lights came on will oil pressure raise back up
Richard-
Thank you for asking about your Chevy Silverado. The BlueDevil Rear Main Sealer does not harden or thicken in anyway, so it wouldn’t clog or restrict flow whatsoever. Based on your description, it’s possible that sludge or engine build-up has been cleaned off the seal, explaining the drop in pressure. Changing the oil in this instance should correct the issue. Feel free to contact our technical support line at 888-863-0426 if you have any other questions.
Thank you!
-BDP
Does the BlueDevil Rear Main Sealer have to be added at each oil change?
No, it only needs to be added one time; it creates a permanent seal.
-BDP
If you accidentally put half a bottle of blue devil rear main into your transmission, will it harm your transmission?
Felix-
As long as it didn’t overfill the transmission system, it would not cause any harm.
Thank you!
-BDP
My 1972 challenger takes 5 quarts of oil at every oil change. If I add your rear sealer at
that time, can I still add the 5 quarts of oil, or will it be over filled ?
Tom-
Yes, you will still add the full 5 quarts of oil.
-BDP
Can I add bluedevil oil stop leaks & BlueDevil Rear Main Sealer at the same time?
Tony-
It would not be necessary to use both products at the same time. If you have multiple leaks then you will only need to add 1 bottle of the BlueDevil Oil Stop Leak; it would address the rear main leak as well.
Thanks!
-BDP
99 eclipes with a bad rear main seal. ill be doing the work myself. but i need to know. is there any quick fix i can do. so i can get it to the shop i need to work on it at. the shop is around 45 mins away from my place. could i drive it with a quick fix till i get it to the shop, or just get it towed?
Chris-
We do manufacture a product called the BlueDevil Rear Main Sealer but if you are losing oil so quickly that you are unable to drive the vehicle then the leak is too large for what BlueDevil is intended to fix.
Feel free to contact our tech support team at 888-863-0426 with any further questions.
Thank You!
-BDP
I have a 2004 corvette I have been smells burning oil on pipes. My friend suggested that they may have put regular oil in my car by mistake. I run synthetic oil. While at oil change I wanted to know if they see any oil dripping because I am going on a 51/2 hours trip Thursday and o want to know if my car is safe to drive. They noticed a small leak around oil pan seal a rear main seal. But I see no oil on the drive way. Will the seal help and is my car safe to drive
Kenneth-
Thank you for asking about your Corvette. As long as keep the system topped off with oil, it should be safe to drive.
Based on your description, we recommend using the BlueDevil Oil Stop Leak. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
Thank you!
-BDP
I have a 1992 honda accord lx, it’s leaking I think from the camshaft seal, what is the strongest oil stop leak do you have, this seems to be the only issue with my car, having to keep oil in it.
Charles-
The product we recommend using is the BlueDevil Oil Stop Leak. You should notice results after about 100 miles of driving.
Thank You!
-BDP
I have a 89 volvo 244 DL and its leaking oil. I thought it was the crankshaft seal and changed it, but it still leaks. Puddle of the ground
Latrice-
Thank you for asking about your Volvo 244 DL. Based on your description, we recommend using the BlueDevil Oil Stop Leak. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak.
Thank you!
-BDP
I have 03 4.3l Chevrolet. I added one bottle of Rear seal leak fix from you guys. It slowed a bit but still leaks. I really dont want to drop the transmission to swap the seal just yet. Will it hurt anything to add another bottle just to see if it works?
Jeff-
How many miles have you driven since the BlueDevil Rear Main Sealer was added?
Feel free to contact us at 888-863-0426 to discuss your vehicle further.
Thank You!
-BDP
I have driven almost a thousanf miles and still have a slight leak. Could I add more?
Justin-
We would like to discuss the leak and your vehicle in a little more detail. Please contact our tech support team at 888-863-0426; we would be happy to help you out!
-BDP
I have a e 350 van 1999 hade a rear main seal put in cost 1000.oo it still leaks put in 3 blue devil rear main sealer. still leake?
Leonard-
How many miles have you driven since BlueDevil Rear Main Sealer was added? It can take up to 200 miles of driving before you see the full results of the product.
Thank you!
-BDP
can i buy product in australia?
Garry-
We do not currently have any distributors in Australia but the product can be purchased direct through our website (gobdp.com) and shipped to your residence. The website will automatically calculate the shipping cost after you enter your mailing address.
Thank You!
-BDP
I have an 02 acura rl that has oil leaks from the rear main seal as the mechanics said , can I put the blue devil rear main sealer with the existing oil I have?
Tony-
Yes, the BlueDevil Rear Main Sealer can be added to the existing oil. You should notice results after about 100 miles of driving.
Thank You!
-BDP
Is it availible in canada
Brian-
Yes, the BlueDevil Rear Main Sealer is available at Canadian Tire. Feel free to contact our technical support line at 888-863-0426 with any questions.
Thank you!
-BDP
I just want to know, if I have replaced the seal, what could cause that there is still a leak,because it’s stressing me realy out.please help
Earl-
It may be that the leak is coming from elsewhere, ie. oil pan gasket, valve cover seal, etc. We would recommend using the BlueDevil Oil Stop Leak, found here: http://store.gobdp.com/oil-stop-leak-49499/ . The Oil Stop Leak is a universal application and would be able to seal leaks coming from the rubber seals or gaskets in the system. Feel free to contact our technical support line at 888-863-0426 with any questions.
Thank you!
-BDP
I added the stop leave to my engine oil and run it for the recommended 1-2 hours. As I drive I was getting a lot of smoke coming from the car is this normal or another problem??
Rich,
The smoke is not normal for using oil stop leak. If the smoke is coming from your tailpipe, it is an indication that you’ve got a bigger problem like too much oil or internal damage to your engine. If the smoke is coming from your engine bay, it is an indication that you have a bigger leak and should consider replacing the seal or gasket to avoid a fire hazard.
Thanks again for your question!
-BD Auto Pro
If you think it is your rear main seal could it be the valve cover gasket leaking down.
Kyle-
Yes, that is possible. If you are not 100% sure where the leak is coming from, we recommend using the BlueDevil Oil Stop Leak http://store.gobdp.com/oil-stop-leak-49499/. The BlueDevil Oil Stop Leak is a universal application and would treat leaking oil pan gaskets, valve cover seal, rear main seal, etc. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I have a 88 corvette,bought in April with 49000 miles.Today I found the rear main is leaking.Will your product stop the leak and should I drive it before I store it in Nov? Thank you. Larry aka sick to my stomach.
Lawrence-
Yes, you can use the BlueDevil Rear Main Sealer for your Corvette. You should start to see results after about 100-200 miles of driving.
Thank you!
-BDP
Larry-
Yes, the BlueDevil Rear Main Sealer would be able to stop the leak in your Corvette. You should start to see results after about 100-200 miles of driving.
Thank you!
-BDP
I have an 88 f150 with the 302. It looses about a quart of oil for every 20 miles i drive it would blue devil be enough or is the leak too severe?
Drew-
Based on your description, the leak is too large for what BlueDevil is intended to fix. We recommend making a trip to your mechanic to have the repair made.
Thank you!
-BDP
I have a 2001 tahoe i put in blue devil main seal. Drove like 90 mile so far i had 1 drop leak i check after. The 200 mile mark
Isaac-
We appreciate your feedback! Feel free to contact our technical support line at 888-863-0426 with any questions.
Thank you!
-BDP
I have a 1991 jeep Cherokee Laredo that is leaking from the rear seal and the front seal, is the rear main seal is enough for this problem or there is another product that i can use
best regards
Jose Fuentes
Jose-
Based on your description, we would recommend using the BlueDevil Oil Stop Leak. The Oil Stop Leak is a universal application so it would treat an oil pan gasket, valve cover seal, rear main seal, etc. Where as the Rear Main Sealer is specifically formulated for the rear main seal, so it would really only be able to seal leaks coming from this area. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I was told having a rear main seal leaking bad. I put in a can and drove over 300 and seems to have slowed down a lot. Seeing a small spot..should I continue to drive and see if stops or drain and refill oil and then add another can to see if it stops completely..what do you recommend.
d
I have a 2013 ford focus with 28,700 miles; ford announced an extended warranty on these (and other model years)
‘Transmission clutch shudder/trans. input shaft seal’ – I just had an oil change (not at the dealer) and a comment
on the bottom sheet was ‘rear main seal does leak’; I’m thinking this is what ford was talking about (extended warr);
The drives fine and I haven’t noticed any leak under my car (haven’t looked closely) ; I made an appt. for service
on the 29th of Dec.; should I wait that long or get it looked at sooner? (I guess that was the earliest possible day
for the appt) I told the service person about the leak……..
Scott,
Thanks for your question about your Ford Focus. Based on your and the mechanic’s description of the problem you should be just fine to wait until the 29th to have your car looked at. Unless you’re seeing puddles of oil under your car after parking it your rear main seal isn’t leaking bad enough to cause any immediate problems. Hopefully Ford will honor their extended warranty and get your problem fixed quickly!
Thanks again for your question!
-BD Auto Pro
Did you have to pay the Ford dealership to get your real main seal fixed? I had a leak 6 months ago and paid over $800, but just saw that it’s part of the settlement. Now I’m trying to get reimbursement.
97 Honda accord se. Has an oil leak coming from the back of the engine somewhere causing the oil burning smell.. Not sure of where its coming from. New head gaskets, valve cover gasket, distributor o-ring, oil pressure switch ect… I think it could be the rear main seal being it wasn’t changed when I had the transmission swapped. What would you suggest using? Rear main sealer or oil stop leak?
Thanks. Nick
Nick-
Thank you for asking about your Honda Accord. The BlueDevil Oil Stop Leak is the universal application and will work for oil pan leaks, rear main leaks, valve seal leaks, transmission leaks, power steering leaks, etc. Whereas the Rear Main Sealer is specifically formulated for the rear main seal. If you are not sure where the vehicle is leaking or there seem to be multiple leaks, we would recommend using BlueDevil Oil Stop Leak.
Thank you!
-BDP
I have just discovered a leak under my car, while replacing a radiator fan. My dad says it looks like the rear main seal. Without knowing, do i use your RMS leak stopper or go straight to Blue Devil Oil stop? I dont know how long its been leaking, saw a little bit a week ago, no low oil light, but i am at the min level now. Also no noticeable puddles under my car and didnt leak while i was under it. Just wet.
Mike-
Thank you for asking about your VW Rabbit. Based on your description, we would recommend using the BlueDevil Oil Stop Leak. The BlueDevil Oil Stop Leak is the universal application and will work for oil pan leaks, rear main leaks, valve seal leaks, transmission leaks, power steering leaks, etc. Whereas the Rear Main Sealer is specifically formulated for the rear main seal. If you are not sure where the vehicle is leaking or there seem to be multiple leaks, the Oil Stop Leak would be the best place to start.
Thank you!
-BDP
Also to the coment above, its a 09 VW rabbit/gas inline 5
After puting in Blue devil do I have to actually drive my car or can it idle for an hour in my driveway?
Patrick-
In order to get the benefit of the product, you would need to drive the vehicle. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
It appears that the rear main sealer is superior to the oil stop leak when the leak is specifically the rear main seal. If not why do you make two products that equally fix a rear main seal leak.
Dave-
The Oil Stop Leak is the universal application and will work for oil pan leaks, rear main leaks, valve seal leaks, transmission leaks, power steering leaks, etc. Whereas the Rear Main Sealer is specifically formulated for the rear main seal. If you are not sure where the vehicle is leaking or there seem to be multiple leaks, we would recommend using the Oil Stop Leak. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I have 88 Ford f-150 5.0 302 & I just bought ur rear main seal repair cause I’m losing about a little under a half of Cort of oil maybe not that much but longer it sits its alit more, but my question is if I put this in my oil will it leak out with the oil & how long does it take to fix it.
Scott-
You will normally start to see results with the BlueDevil Rear Main Sealer (http://store.gobdp.com/rear-main-sealer-00234/) after about 100 miles of driving. As long as the leak is not severe you should have no problem sealing it with the Rear Main Sealer.
Thank you!
-BDP
MY 1999 FORD 150 4.2 6CYL REAR MAIN SEAL LEAKING AND TRANS IS STARTING TO JUMP AND THEN GO NORMAL AM I TO LATE FOR THE SEALER THANKS ROBERT.
Robert-
We recommend adding one 8 ounce bottle of BlueDevil Rear Main Sealer. You can expect to start seeing results after about 100 miles of driving.
We also recommend that you change your transmission fluid and filter; be sure to fill it to the proper level. The rough shifting may be due to old/dirty transmission fluid. If the “jumping” continues after doing so then your best bet may be to have it looked at by a transmission specialist.
Thanks!
-BDP
Would this work for 475 hp Cummins isx diesel engine and is it available in Canada? Front accessory seal leaking and oil pan.
Mike-
Based on your description, we would recommend using the BlueDevil Oil Stop Leak, found here: http://store.gobdp.com/oil-stop-leak-49499/ . The Oil Stop Leak is a universal application and would treat leaks coming from the oil pan gasket, rear main seal, etc. Whereas the Rear Main Sealer is specifically formulated for the rear main seal. We do not currently have any retailers in Canada, however, the product is available for sale on our website and we do ship Internationally.
Thank you!
-BDP
Can the stop oil leak formula and the rear main seal formula be used together??
Tommy-
The BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for just the rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
Thank you!
-BDP
If i use blue devil should i replace the seal in future or not
I
Nelly-
You will not have to replace the rear main seal any time after using BlueDevil Rear Main Sealer. Once the leak has stopped, the seal will have the life of a new seal.
Thank you!
-BDP
I have a 2015 Chevy Silverado with 9,000 miles. How common is a leak
Jr-
A leak should not develop when the vehicle has been driven under 10,000 miles. We recommend checking with the dealership to replace the seal as the vehicle should still be under warranty.
Thank you!
-BDP
Hi I have noticed in the last week that my rear main seal is leaking. I have a Straight truck Freithliner Business Class 2007 How much do I need to add to help stop the leak one or two bottles? Thanks
Juan-
Thank you for your question. One 8 oz bottle of the BlueDevil Rear Main Sealer will treat up to 8 quarts of oil.
Hope this helps!
-BDP
Hi,
I have 96′ Toyota Celica GT, auto/trans, 145,000 miles.
I have a couple of issues with my motor and I was hopping that I could fix my R.M.S. at the same time while i’m using a Lucas “Stop Smoke” additive?
Any suggestions would be greatly appreciated!
Thx.
Steve B.
Steve-
Thank you for asking about your Toyota Celica GT. Yes, you can add the BlueDevil Rear Main Sealer to your current engine oil, as it would be compatible with the Lucas additive you are using. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
I have an 09 VW CC 2.0L TSI 6-speep turbo in the shop now and the dealer said the rear main seal is leaking a little. If I add the BlueDevil Rear Main Sealer with this cause any harm to a turbo-charged stratified injection engine?
Kirk-
Thank you for your interest in the BlueDevil Rear Main Sealer. The product does not harden or thicken in any way, so it would not have any adverse affects on your engine. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
Do it work?
Marquis-
Overall, BlueDevil Rear Main Sealer carries a success rate of over 90%. As long as you are not dealing with a severe oil leak you should have no problem sealing it using BlueDevil Rear Main Sealer.
Thank you!
-BDP
Can I use the rear sealer and let it idle for awhile or do I have drive it?
Lukas-
For proper results, you would need to drive the vehicle in order for the product to seal. Typically, you should start to see results after about 100-200 miles of driving.
Thank you!
-BDP
i have a 86 camaro with the 2.8 the underneath is coated with oil and i lose about a quart every week to two weeks
William-
Thank you for asking about your Camaro. If you are positive the leak is coming from the rear main seal, then the BlueDevil Rear Main Sealer would be able to treat the leak. If you are not completely sure or if you have multiple leaks, I would recommend using the BlueDevil Oil Stop Leak. The Oil Stop Leak is a universal application and would treat a leaking oil pan gasket, valve cover seal, rear main seal, etc. where as the Rear Main Sealer is specifically formulated for the rear main seal. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I have a 6.0 Cadillac motor with a hundred and twenty thousand miles a small leak on the main seal but it does cause me to put a quart of oil every 3 months should I change my oil now what fresh oil in it is that okay after using Blue Devil
Frank-
Yes, you may add BlueDevil Rear Main Sealer on a fresh oil change. The product can be left in for the life of the oil. Once it has been added you can expect to start seeing results after about 100 miles of driving.
Thank you!
-BDP
I have a 1981 corvette that is leaking oil from the rear main seal.will blue devil main seal sealer take care of this problem ? Also do you have to use it every time you change the oil?
Bobby-
Thank you for asking about your Corvette. The BlueDevil Rear Main Sealer is compatible in your vehicle. As long as you are not losing oil too quickly, you would be a good candidate for the product. Typically, you should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
I have a Hyundai/Kia Epsilon G4HE(1.0L) engine which is notorious for developing rear main seal leaks. While mine is still leak free, I was wondering if adding a can of BlueDevil Rear Main Sealer as a preventative measure would be effective or not in stopping or prolonging a leak from developing?
Yes, you may use BlueDevil Rear Main Sealer as a preventative measure. The product will rejuvenate and recondition the rubber seals & gaskets within your fluid oil system.
Thank you!
-BDP
One more question, on my 6.0 diesel ford engine should I use 1 treatment of blue devil rear main seal or 2 because of the amount of oil needed per oil change?
Manny-
You will be using one ounce of the product per quart of oil in the system. The BlueDevil Rear Main Sealer comes in an 8 ounce bottle.
Hope this helps!
-BDP
I have serviced my car today. The mechanic said there is rear main oil seal leak in the car. But I have not found any oil coming out in the rear side of the car. However, I find very small amount of oil at front of the car. What does this mean? He also said there is leak in engine oil pan. Is it really dangerous?
Pasha-
Thank you for your question. Based on your description, it sounds like you are experiencing multiple leaks. We recommend using the BlueDevil Oil Stop leak to treat the leaks in your vehicle. The Oil Stop Leak is a universal application and would treat leaks coming from the oil pan gasket, valve cover seal, rear main seal, etc. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
I have a 1962 Ford Falcon with 170ci 6 cylinder. I have replaced the rear seal ( two piece seal) with a rubber seal…actually changed it three times. Each time it seems to take thirty minutes…last time it took one hour before it starts a very slow drip. It is definantly coming from the rear main seal. Will Blue Devil take care of this issue?
John-
Thank you for asking about your Ford Falcon. As long as you are not losing oil too quickly, you would be a good candidate for the BlueDevil Rear Main Sealer. Typically, you will start to see results after about 100-200 miles of driving.
Thank you!
-BDP
Had my 09 Escape in for an oil change last week. Using high mileage oil as I’m currently at 328,000km. They informed me that they believe I have a rear main seal leak and there was oil around the oil pan. I found this page after searching another issue. I keep reading your product doesn’t harden. If I bought the BD Oil Stop Leak, how does it repair the seals?
I don’t have any puddles or marks on the ground beneath the car so I’m guessing the leak is very slow.
Would using this product be ok with high mileage oil?
How does it seal without going hard? I’d hate to use it and cause other issues.
Thanks
Rob-
The BlueDevil Oil Stop Leak does not harden or thicken in any way, so it would not have any adverse affects on the engine. The product seals leaks by revitalizing and reconditioning the rubbers in the system, and will expand them, or slightly swell them back to their original state. The product is also compatible with synthetic oil. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I have a 1999 Dodge Stratus with 157,000 miles. I have always had the proper maintenance done on time. I have always had an oil spot on my garage floor but noticed the last couple of months that it was getting larger. I took my car to my local mechanic who I have used for many years. He told me that it was a real main seal. I cannot get the work done for a couple of weeks due to personal circumstances and was told it was okay to drive it. He assured me the leak has been occurring for a period of time and not all at once. Will the Blue Devil Rear Sealer work in my car and hopefully stop the leak? Or is this a band-aid approach and the real main seal will have to be replaced anyway?
Linda-
Thank you for asking about your Dodge Stratus. Based on your description, you would be a great candidate for the BlueDevil Rear Main Sealer. Once the product seals, it would be a permanent seal. Typically, you would start to see results after about 100-200 miles of driving. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
Hi there, I just used the blue devil rear main sealer in my truck yesterday. After driving it for 30 minutes and letting it sit over night, I noticed a fluid mark under my truck the same size of the oil marks I was getting from the oil leak, but the fluid was 90℅ blue devil rear main sealer and maybe 10℅ oil. Is it normal for the sealer to leak out without mixing with the oil, or does it not mix together just like water and oil?
Kevin-
Yes, it is normal to see the product separate from the engine oil when some has leaked out. The product works by reconditioning and rejuvenating the leaking rubber seal or gasket. Expect to start seeing results after about 100 miles of driving; it is still too early to know whether or not the product is going to work after a 30 minute drive.
Thank you!
-BDP
My mechanic found a rear main seal leak in my 2002 Acura MDX with 160k miles. There is no oil leaking where we park it overnight, just in the pan under the car. I found your Rear Main Sealer online, and asked my mechanic about it. He said liquid sealers that patch the seals can cause adverse effects on other parts of the engine that you do not want to be sealed, like valves. He said it’s only recommended for older cars to keep them going for longer.
What are all of the possible side effects of using Rear Main Sealer? Thanks
Jamie-
BlueDevil Rear Main Sealer does not harden or thicken to stop leaks, therefore there is no risk in using it in your steering unit. It is 100% safe and compatible to use in your Acura. BlueDevil works by slightly expanding the rubber seal or gasket and reconditioning it to bring it back to its original size and condition.
Thank you!
-BDP
I have a 2003 Acura MDX and my mechanic said I have an Oil pan leak and he will have to drop the pan which will cost over $800 . Will the blue devil oil stop leak work or will there be side effects if I use it
Rudy-
Thank you for asking about your Acura MDX. Based on your description, we would recommend using the BlueDevil Oil Stop Leak, http://store.gobdp.com/oil-stop-leak-49499/. The product will not harden or thicken in anyway, so it would not have any adverse affects on the system.
Thank you!
-BDP
I have a 2006 Mercedes cls 500 which has a slight leak in my rear main seal. Will this product have any adverse reaction on this engine?
Carantino-
Thank you for asking about our Mercedes cls 500. The BlueDevil Rear Main Sealer will not harden or thicken in any way, so no, it would not have any adverse affects on the engine. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I own a 2003 Chevy Cavalier. I was told that I have a rear main seal leaking. I put in BlueDevil Rear Main Sealer yet it didn’t stop the leak .Would I be able to add the Bluedevil Oil Stop leak just in case the diagnosis was incorrect or I may have several leaks from different places or would the Oil Stop leak interfere with the Rear Main Sealer ? Thanks Cile
Cecile-
You should not have to add both products to stop your rear main leak. Keep in mind it usually takes at least 100 miles of driving before you will start to see results after BlueDevil Rear Main Sealer is added. If you haven’t driven more than 200 miles with the product in the system then it may be too early to tell as to whether or not the product is going to work.
Feel free to contact us at 888-863-0426 with any questions.
Thank you!
-BDP
Will this product work without driving the car? I noticed the product states that there won’t be a noticeable difference for about 100 to 200 km of driving. Will it start working if I just leave my car idling…? Or does it actually need the car to be on the road to work?
Jerry-
In order to get the benefit of using the product, you would need to drive the vehicle. Simply letting the vehicle idle would not have much of an effect.
Thank you!
-BDP
I have a 20 05 Chevy Tahoe an was told The rear seal was leaking and I was needing to drive out of state will it be safe for me
Christina-
Yes, the BlueDevil Rear Main Sealer is 100% safe and compatible to use in your Chevy Tahoe. You should expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
Hi BDP,
I have a 388 stroker with a strong Comp cam with about 4500 miles on the engine. I recently had my main seals replaced. After the repairs the engine looked as though it was still leaking from the rear main seal. My mechanic shop put a camera in between and said that it was leaking from the pan and ran the engine but didn’t actually drive it after retightening the oil pan. After I got the car back it looked as though the leak had stopped, but after driving it for a while it show a drop or two of oil at the rear seal.
Do you think that your product will work on this type of engine of high performance without doing any internal damage.
Thanks in advance for your reply.
Will-
Thank you for asking about your 388 Stroker. You mentioned that the shop said the leak was coming from the oil pan gasket. Based on your description, we recommend using the BlueDevil Oil Stop Leak http://store.gobdp.com/oil-stop-leak-49499/. The Oil Stop Leak is a universal application and would treat leaking oil pan gaskets, valve cover seals, rear main seal, etc. whereas the Rear Main Sealer is specifically formulated for the rear main seal.
The product does not harden or thicken in anyway, so it would not have any adverse affects on the engine or system itself. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
Oil just starting leaking under my 2000 Jaguar Vanden Plas during the last few months. The Jaguar dealer says it is a rear main seal leak. It is not leaking much, just a few drops every day and they want $1700.00 to repair it. Can I use your product in my Jaguar without any engine damage?
Lena-
Yes, The BlueDevil Rear Main Sealer is safe and compatible to use in your Jaguar. You should expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
I have read mixed reviews on this product for different reasons so I’m slightly confused on if it will work for me. My oil leak started as drips about 9 months ago, but I didn’t pay much attention to it. Now, it’s leaving large puddles literally everyday, my husband adds a bottle of oil a day. We tried the (different brand) stop oil leak with no success and now we were told it’s the rear main sealer that needs to be replaced. While searching for the part I came across this product. My question is… Is the leak too far gone for this to work effectively? During the drop off for an oil change, I would like to hand this product to my mechanic to use at that same time, but it’s pointless if it’s too late to solve our leak. Any suggestions?
Kem-
Based on your description, unfortunately, the leak you have may be a little larger than what the BlueDevil Rear Main Sealer is intended for. Typically with the product, you would start to notice results after about 100-200 miles of driving. If you are losing oil to the extent that you would lose your oil capacity before you got to that 100 miles, you more than likely would have lost the product in that time and wouldn’t be able to keep it in the system long enough in order to get the benefit of using it.
Thank you!
-BDP
Will your product work on a leak coming from the axle/differential ?
James-
The BlueDevil Oil Stop Leak http://store.gobdp.com/oil-stop-leak-49499/ would be your best option for sealing a leaking axle/differential. You will be using one oz. of the product per quart of fluid in the system.
Thank you!
-BDP
Hi, I have an Audi A4 2010, and the dealers told me I have an air leak coming from my rear main seal. Would your product address this issue, and if so, how?
Silviu-
Thank you for asking about your Audi A4. Are you noticing a loss of oil? The BlueDevil Rear Main Sealer works by revitalizing and reconditioning the rubber seals and slightly expanding them back to their original state. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
So glad I found this site. I have 2003 Chevy Blazer with 133,000 miles. Mechanic found rear main seal leaking, upon futher inspection he said my valve cover, oil pan, power steering was leaking. I’m going to try the Oil Stop Leak before spending about $2,000 to have it fixed. Will reply back to let you know how it worked for me. Thanks for the very informative site.
Vivian-
Please contact our technical support team at 888-863-0426 if you run into any questions.
Thank you!
-BDP
We put Blue Devil product in but our mechanic when he saw it and told it what it was said we also needed an “oil pan gasket” along with the reàr main seal leak. What should we do? Just replace the oil pan gasket now and tell our mechanic we got the leak itaelf fixed?
Shawn-
The BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/) would be able to seal a leaking oil pan gasket. Are you saying that you used the BlueDevil Rear Main Sealer, took the vehicle to the mechanic, and then was also diagnosed with a oil pan gasket leak? Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.
Thank you!
-BDP
Can BlueDevil Real Main Sealer be used with synthetic oil?
Dan-
Yes, the BlueDevil Rear Main Sealer is safe and compatible to use in synthetic oil.
Thank you!
-BDP
Now I saw one second hand car plan to buy. But in these car oil leak between engine and transmission gear mechanic say its seal we can rectify these issues. its minor or major problem.
Siva-
As long as the vehicle isn’t losing oil too quickly, you would be fine in adding the BlueDevil Rear Main Sealer (http://store.gobdp.com/rear-main-sealer-00234/). Typically, you can expect to see results after about 100-200 miles of driving.
Thank you!
-BDP
Just fitted crate ls3 engine from USA run it found rear main seal leaks do not have option of return as I am libel for freight cost have inspected drips off starter motor & inside bellhousing checked with camera can see it wet around crank seal most a few drops but annoying will blue devil fix problem as no support from seller with costs
John-
Based on your description, we recommend using the BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/). The Oil Stop Leak is a universal application and would treat any of the rubber seals/gaskets in the fluid oil system, where as the BlueDevil Rear Main Sealer is specifically formulated for the rear main seal. For multiple leaks, the Oil Stop Leak is what you would want to use.
Thank you!
-BDP
98 Honda Civic with minor oil leak (doesn’t drop level very fast). Oil change shop noted leaking rear main seal and leaking pan – didn’t say whether it was a pan gasket or crack or other. Already used 1 bottle of rear main sealer after oil change less than 500 miles ago. Still have minor leak. Could I try a bottle of oil stop leak to see if that helps the pan issue or would that dilute the oil? I think there is capacity to top off oil reservoir to upper limit with oil if that is recommended.
Joe-
Thank you for asking about your Honda Civic. Based on your description, we do recommend using the BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/). The BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for just the rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak.
Thank you!
-BDP
Hello! I have an 2005 Acura TL that is leaking from rear main seal. I used the whole bottle of Blue devil stop rear main seal leak and I’ve driven about 35 miles. I see that the leak is about a penny size.
My question, if my leak is somewhere else, can I buy the other blue devil stop leak seal product and use it, even if Im nt sure if I have a leak from another place? What will it do if I already used the rear main seal stop leak product from blue devil?
Ivan-
Thank you for asking about your Acura TL. Typically, you would start to see improvement after about 100-200 miles of driving. If the leak is coming from an area other than the rear main seal, unfortunately, the BlueDevil Rear Main Sealer wouldn’t have any affect. Based on your description, we recommend driving the vehicle for the 100-200 mile allotment, and if you still have some what of a leak at the point, you would safely be able to add the BlueDevil Oil Stop Leak. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
Can I use this twice? First application didnt work. Want to try again
Kawika-
Did you notice any improvement after the first application? Please contact our technical support line at 888-863-0426 so that we may assist you in receiving a replacement bottle.
Thank you!
-BDP
Are Rear Main seal leak stopping products safe for all engine seals and gaskets? I’ve heard of a chemical reaction when using such products that is harmful in the long run? 2001 Honda Civic Ex. 1.7 SOHC vtec
Josh-
Thank you for asking about your Honda Civic Ex. Yes, the BlueDevil Rear Main Sealer is 100% safe and compatible to use in your vehicle. The product does not harden or thicken in anyway, so it would not cause any adverse affects on the engine or the system itself. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
There is no oil on my garage floor where I park my car, but my mechanic has verified that a small leak is occurring on my Toyota 4Runner’s rear main seal. Provided that I use your product – BlueDevil Rear main sealer- as per your instruction [use one 8-oz. bottle and drive it between 100 -200 miles] does your product carry any sort of warranty/guarantee against engine damage?
Ruben-
BlueDevil Rear Main Sealer is 100% safe and compatible to use in your 4Runner. The product does not harden or thicken at any point. It also does not contain petroleum distillates, which can shorten the life of seals. Once BlueDevil is added you can expect to start seeing results after approximately 100 miles of driving.
Feel free to contact our tech support team at 888-863-0426 with any further questions.
Thank you!
-BDP
I have a 2002 Honda CRV with 58000 miles on it (very low mileage) I now have noticed a leak and have had it into the dealership twice and they are unable to find where the leak is coming from. They did put a dye in to see if they could find the leak and they still are unable to say positively it’s coming from the rear main. First they thought it was coming from the spool valve and I am not a mechanic so I have no idea what they are talking about. I have had the valve cover gasket changed 3 times and the mechanic says he knows for sure it isn’t coming from there. When I took it in this last time they told me I had not driven enough miles to work so I guess what my question is what product do you suggest and is it safe for my car since this is the last car I plan on buying. Thank you for any help you can give me
Vicki-
The BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for just the rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
We recommend applying 1 bottle of BlueDevil Oil Stop Leak given that you are not 100% positive as to where the oil is leaking from. Expect to start seeing results after approximately 100 miles of driving.
Thank you!
-BDP
Have a 1973 Evinrude 40hp, 2-stroke engine. Will this Blue Devil Rear Main Sealer work on repairing oil leak at lower unit and/or drive shaft seal? Also, lower unit only holds about 14 oz. of gear oil. How much Sealer should I add to oil?. Thank you in advance for your response.
Frank-
Thank you for asking about your Evinrude 40hp. Based on your description, we recommend using the BlueDevil Oil Stop Leak (https://store.gobdp.com/oil-stop-leak-49499/). The BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for just the rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. Typically, you would be using one oz. of the product per quart of oil in the system, so you will be using about 0.5 oz. of the product for a 14 oz. system.
Thank you!
-BDP
Will the product still work if the car is idling?
James-
In order to get the benefit of using the Rear Main Sealer, the vehicle would need to be driven. Typically, it will take 100-200 miles before you see full results.
Thank you!
-BDP
I drive a 2011 camry in texas (130K miles), and was told that rear main seal is leaking. They also said that it was leaking in the pan/on the plate. But there is no visible dripping on the ground. Would you recommend using Blue devil, and if so, how will I be able to tell if it worked?
Alamzeb-
Thank you for asking about your Toyota Camry. Based on your description, we recommend using the BlueDevil Oil Stop Leak (https://store.gobdp.com/oil-stop-leak-49499/). BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for only a leaking rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
Thank you!
-BDP
In your response above how does the BlueDevil Oil Stop Leak know where to distribute the for formula?
David-
The BlueDevil Oil Stop Leak works by being absorbed by the rubber seals/gaskets. As you lose oil, the product gets absorbed by the rubbers at the leak point, and will revitalize and recondition them, to get them back to their original state and original flexibility. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
Hi i am having a Renault Scenic 2001 Model the oil under the engine leak and i was told the main seal is finished i dont know much about vehicles i need advice what type of seal i must get
Edwin-
Thank you for asking about your Renault Scenic. As long as you are not losing oil too quickly, you would be a good candidate for the BlueDevil Rear Main Sealer (https://store.gobdp.com/rear-main-sealer-00234/). You should expect to see results after approximately 100-200 miles of driving.
Thank you!
-BDP
My 2001 dodge Ram 1500 is at 200,000 miles. My mechanic just told me that it has a read main seal leak and an oil pan gasket leak. do I use this product alone, or do I need both an oil leak stopper and the rear main sealer or? Thanks,
Alexander-
Thank you for asking about your Dodge Ram 1500. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for only a leaking rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
Thank you!
-BDP
I have a question about your product. I had my oil changed about two weeks ago at the Toyota dealer on my 2006 scion XB with 75,000 miles on it and I am the original owner. Now they tell me my rear main seal is gone as it never leaked before. How long can your product stain in the engine. as my next oil change is not due for about 4500 miles.
Tom-
Thank you for asking about you Scion XB. BlueDevil Rear Main Sealer can stay in the oil for the life of the oil, so it does not have to be changed out immediately or after results are achieved.
Thank you!
-BDP
I have a 2003 BMW 325i with 180K miles that looses 1 qt every 500 miles or so. There is no dripping on the ground and the bottom of the engine does look “wet” and there is engine oil smell OUTSIDE the car but not inside the car after long driving. Should I try this real main seal product, or should I go for the fix-it-all product?
Sam-
Thank you for asking about your BMW 325i. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for only a leaking rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak.
Thank you!
-BDP
I have a 2002 chevy suburban with almost 180k miles … had a rear main leak.. used the rear main sealer.. drove for a couple days… over 100 miles.. parked it… had a very small drip from left and right sides… not the rear main.. think it could be valve cover gaskets… im going to try the oil stop leak hopefully that will fix that.. im trying to pass 300k. Plan on driving it till the wheels fall off.. its been a good truck.
Ben-
Thank you for asking about your Chevy Suburban. The BlueDevil Oil Stop Leak would be the appropriate product to use for valve cover gasket leaks. You should expect to see results after approximately 100-200 miles of driving. Please keep us posted on your results.
Thank you!
-BDP
I have a leak in my Volkswagen Tiguan 2009, I just change oil and filter but I still have the leak. I am afraid of using Blue Devil Stop Leak.
Can we please let me what is my best option.
Juandy-
Thank you for asking about your Volkswagen Tiguan. There is absolutely no harm in using the BlueDevil Oil Stop Leak. The product does not harden or thicken in anyway, so it would not cause any adverse affects on the engine or system itself. As long as you are not losing oil too quickly, you would be a good candidate for the product.
Thank you!
-BDP
I had a rear seal leak in my transmission and bought this without paying attention to use on main seal. I put half bottle in and the leak has stopped. Since this is not the correct product do i need to drain the transmission and put new fluid or is it fine?
Steve-
We are happy to hear of your success! Based on your description, we would recommend changing your transmission fluid and replacing it with new, clean fluid. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
My 2001 Ford Escape has a leaking rear main seal. The car is not driveable but motor runs ok. Will your product work after adding to engine oil and only idling engine versus actually driving the car.
Kenneth-
Thank you for asking about your Ford Escape. Unfortunately, you would only be able to get the benefit of using the product by driving the vehicle. Typically, it would be about 100-200 miles of driving before you would start to notice improvement. Replacing the seal may be your best option.
Thank you!
-BDP
I have a 2007 Yukon Denali XL with 108,000, a mechanic told me the rear main seal was bad so I just put the rear main sealer in. I’m still driving it now for the sealer to work. Another mechanic looked at it today during my state inspection and said it’s not the rear main seal rather the oil pan gasket and oil cooler block off plate gasket. What should I do since I have already put in the rear main sealer, if that was actually not the problem to begin with? Should I add the oil leak as well?
Kevin-
Thank you for asking about your Yukon Denali. Typically, it will take approximately 100-200 miles of driving before you start to see any improvement. Based on your description, if you get to around the 200 mile mark and are still experiencing a leak, we would recommend adding the BlueDevil Oil Stop Leak at that point. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is specifically formulated for only a leaking rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak.
Thank you!
-BDP
have a 2013 Ford Taurus, was just told when getting an oil change that I have a rear main seal leak, can I use the Blue devil now that I just had the oil changed and how far should I drive it once I add it? Do I have to drive the 100-200 miles or just drive it around town for a short period of time?
Patricia-
Thank you for asking about your Ford Taurus. Typically with the BlueDevil Rear Main Sealer, it will be approximately 100-200 miles before you start to notice improvement. It does not have to be a continuous drive. You are fine to go in 5,10 mile intervals, or drive it around like you normally would. It will just be around the 100 mile mark before you start to notice improvement.
Thank you!
-BDP
Hello I have purchased a 77 Buick Regal with a Buick 350 motor that I believe has a reseal leak. I recently replaced both the valve cover gaskets and the intake manifold over to a 4 barrel one with new gaskets and have checked it over and over and can’t find a leak around either of those spots. I have put a bottle of rear main seal in the crankcase and I let the motor run for a hr or so for a few days because I have not really starting driving the car. I don’t know if the running the motor for awhile will suffice because I took the car out around the block and to the gas station up the road and came back home and the leak was really going. My questions are so I have to drive in order for it to seal the leak? Or will me letting the motor run stationary do the same? Also should I get the oil leak since I really don’t know if it’s the rear main seal or possible the oil pan?
Joel-
Thank you for asking about your Buick Regal. You would actually need to drive the vehicle in order to achieve the benefits of the product. Typically, it would be approximately 100-200 miles of driving before you would start to notice improvement. The BlueDevil Rear Main Sealer is specifically formulated for the rear main seal. If you are not sure where the leak is coming from, or have multiple leaks, the BlueDevil Oil Stop Leak would be what you would want to use.
Thank you!
-BDP
Hi I have a 2014 dodge challanger. Had the oil changed 2 days ago . That’s when I was told that the rear main seal is leaking . I actually seen the oil dripping. I asked if I could use your product and was told don’t it will ruin the engine it’s too new for that Any truth to that???
Sylvia-
Thank you for asking about your Dodge Challenger. The BlueDevil Rear Main Sealer would not cause any adverse reactions or harm the engine whatsoever. The product works by reconditioning and rejuvenating rubber seals. The product does not harden or thicken in any way. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I put on rear main yesterday I just drove to work and back then next day i drove it over 300 miles my question is …do I gotta do the same process over since I let it sit last night and drove it today I obviously did know I had to drive it 200 miles to see results
Maria-
Typically with the product, it will be around 100-200 miles of driving before you see results. If you have driven over 300 miles, the product should have sealed by now. It would not be necessary to repeat the process. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
My toyota dyna truck is leaking from a rear main seal what could be the cause. Tried to change the seal and tightened it but the problem persist. What could be the cause?
Stanley-
Are you asking why the rear main seal started leaking in the first place or why after replacing the seal it’s still leaking? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of your question and be able to make any appropriate suggestions.
Thank you!
-BDP
I have a BMW 328xi that I recently brought to a mechanic to see why my car was smelling “hot”. Their diagnosis located an active leak from the rear main engine seal, however, it’s been almost a month and I see no oil dripping, no lights on the dash indicating low oil or anything overheating. Oil level is remaining at the max level. Does any of this make sense, and would the product be worth trying on what I am describing?
Elizabeth-
Thank you for asking about your BMW 328xi. The BlueDevil Rear Main Sealer does not harden or thicken in any way, so even if the vehicle wasn’t experiencing a leak, it would not cause any adverse results. Based on your description, it would be safe to use based on the mechanic’s diagnosis.
Thank you!
-BDP
I have a 08 maxima I used the rear main seal leak was I supposed to drive the 100-200 miles the same day I been having the leak just found out where it was coming from
Martha-
Thank you for asking about your Nissan Maxima. The 100-200 miles does not have to be a continuous drive. You are fine to drive in 5,10 mile intervals, here and there. You are fine to drive it like you normally would. Just keep in mind, it’ll be around 100 miles before you start to notice any improvement.
Thank you!
-BDP
I used the rear main seal BD last Friday and I drove to work 5 days round trip about 70 miles is it to late to drive a Constance 100-200 miles now to see if it will work cause it still leaking
Toni-
Keep in mind, it’ll be around 100 miles of driving before you start to notice any improvement. Depending on the size of the leak, it may take up to around 200 miles of driving before you see the full benefit of the product.
Thank you!
-BDP
How long does the fix last if the Rear Main Seal treatment is successful?
Roberto-
Thank you for your question. Once the product seals, it would be a permanent seal. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I put 3 bottles of stop leak in my car
In won’t damage my car will it ?
Chris-
You added three bottles of the Oil Stop Leak or Rear Main Sealer into your vehicle? What kind of vehicle is it? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.
Thank you!
-BDP
Can you please let me know , is Blue Devil marketed in Canada ?
I have a 1967 oldsmobile 425 cu in motor with a rope type rear main seal will Blue Devil rear main sealer work on this type?
Thank you
Anthony-
Thank you for asking about your Oldsmobile. Yes, you can find our BlueDevil Products at your local Canadian Tire. Unfortunately, we do not manufacture a product intended to stop leaks from a rope seal. The BlueDevil Rear Main Sealer would only have an affect on rubber seals.
Thank you!
-BDP
I have an Audi A3 with a rear main seal leak. The 2.0 engines use a paper thin gasket. Will your product work on this?
Joe-
Thank you for asking about your Audi A3. What year is the vehicle? Are you saying they used a paper gasket? Unfortunately we do not manufacture a product intended to stop leaks on paper gaskets. Replacing the gasket may be your best option.
Thank you!
-BDP
Hello , I have a dodge nitro 2.8 turbo diesel engine in Italy , 2/3 weeks ago I notice small drop of oil come from engine and transmission , if I put bluedevil in the dodge it’s won’t be damage the oil pump or valve Lifter ??
And if the leak is fixed I have to change oil? Thanks you so much
Syed-
Thank you for asking about your Dodge Nitro. The BlueDevil Rear Main Sealer does not harden or thicken in anyway, so it would not cause any harm to the engine. Also, it does not contain any petroleum distillates, which would shorten the life of the seals. You can leave the product in the oil for the life of the oil. It does not have to be changed out after results are achieved.
Thank you!
-BDP
Thanks you for the advice, I also have one more thing , it’s I Italy now very hot weather 38°c now and engine come very very hot it’s any problem with that? And i bay on eBay on you shop who many days really have to wait for the delivery? Thanks again so much
Syed-
As long as the vehicle isn’t overheating, ambient temperature would not really make a difference. We do not currently sell on Ebay, so we would not be able to look up any of your order details.
Thank you!
-BDP
I have a 2001 Toyota Avalon . i changed my Front valve Gasket but was not able to get to the back one. when i was changing my brakes i noticed oil leaking on the back side of the engine passenger side it is leaking onto a crossbar. so i am not sure if it is the rear main seal. should i just use the Blue Devil Oil Stop Leak. incase it is my rear main seal or my back valve cover. i am seeing little puddles but not much on the driveway. i am still using 5w30 should i go to a thicker oil when i change the oil then add your product. this car has over 200,000 miles
Dewey-
Thank you for asking about your Toyota Avalon. Based on your description, we would recommend using the BlueDevil Oil Stop Leak. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. You are fine to use the product with the oil you are already using.
Thank you!
-BDP
Hi there.
Regarding this rear main oil leak.
If there is a leak will I be losing engine oil or gearbox oil?
I have a very slow leak.
Cliff-
A rear main seal leak would indicate that you are losing engine oil. If you are not losing oil too quickly, you would be a good candidate for the BlueDevil Rear Main Sealer. You should expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
I have a 2012 Ssyangyong Actyon Pickup. It is back pressures and I changed a rear engine oil seal recently (1 month ago). Due to the back pressure the mechanic told me that the seal have to be replace again. As this is a very expensive exercise, what product or products you would recommend to eliminate this expensive problem. Any help would be appreciated. Thank you.
Faiz-
We recommend applying 1 bottle of BlueDevil Rear Main Sealer (part #00234) to treat your pickup.
Thank you!
-BDP
I have a 2002 f150 5.4L Triton Crewcab, 250700 miles. Discovered I had a rear main leak and valve cover leak.
I just put in an oil pump and timing chains, with all new parts and my question is… Will it seal the rear main and if the valve covers will seal also. Thanks Cliff from Social Circle, Ga
Cliff-
Thank you for asking about your Ford. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. It is not necessary to add both products simultaneously.
Thank you!
-BDP
Has blue devil ever Caused the truck to overheat after use just put in my truck and about 2 1/2 hours later I see a rise in temperatures
07 Chevy 1500 classic 4.8l Believed to have a rear main seal leak
Alissa-
Thank you for asking about your Chevy 1500. BlueDevil Rear Main Sealer is 100% safe to use. The product does not harden or thicken in any way, and would not have any influence on the temperature rising or starting to overheat. However, if your vehicle is low on oil, the engine wouldn’t be running as efficiently as it’s designed to, causing the engine to work harder than normal and could cause it to overheat.
Thank you!
-BDP
I have a 67 ford econoline. used a bottle of rear main seal . Leak slowed for a while but back now . not 100 percent sure its the main seal . Should I try the oil seal?
Mark-
Thank you for asking about your Ford Econoline. If you noticed improvement on the first application, a second application may be recommended. Please contact our technical support line at 888-863-0426 so that we may better assist you.
Thank you!
-BDP
I have recently purchased a blue devil rear main seal product as I believe my rear main seal is leaking and I don’t think I have driven my 2013 5.3L sierra enough yet after adding the product? I added the whole bottle in to my engine, drove it around for an hour placed a piece of paper under the truck to see if it is still leaking. Next morning I didn’t see a leak on the paper, however after I taking my truck out for another drive, parked it for a few hours and placed a new sheet of paper underneath and this time I saw a small leak on the paper. Obviously I haven’t driven the recommended miles, but if it is still leaking after the recommended 200 miles would you recommend me try the oil stop leak product or bite the bullet and pay the mechanic.
Jeremy-
Thank you for asking about your GMC Sierra. Typically, it will take between 100-200 miles of driving before you start to notice improvement with the BlueDevil Rear Main Sealer. Depending on the size of the leak, it may take up to 300 miles before you see the full benefit of the product. If the product is unable to seal the leak and you are unsure of next steps, feel free to contact our technical support line at 888-863-0426. We would be happy to assist you.
Thank you!
-BDP
Can your rear main seal cause the oil dripping out to smell like gas ? I definitely have oil on my flyweel and know the seal is out but would it smell like gas
Brenden-
If your oil leak smells like gas, it would indicate gas is getting into the engine oil. You can also try checking the dipstick as well to see if it smells like gas. This could mean bad piston rings are allowing gas to get into the engine oil through the combustion chamber. Unfortunately, you may want to bring the vehicle in to a mechanic for a diagnosis.
Thank you!
-BDP
HI – have a slight leak from my rear main seal on my 1999 Ford E 150 Van Will you have to add this product at every oil change ? or does it last longer.
Thanks
Joel-
Thank you for asking about your Ford E-150. Once the product seals, it would be a permanent seal. It is not the kind of thing that would need to be added with every oil change.
Thank you!
-BDP
I have a 1965 Lincoln. When it gets out the oil starts pouring out of the rear main seal. Will this product help in this situation. I can drive about 15-20 Mike’s before the seal starts to let go.
Mike
Mike-
Thanks for asking about your Lincoln. BlueDevil Rear Main Sealer is intended for leaks that are seeping or lightly dripping. If you are losing oil too quickly, you would lose the product just as quickly, and wouldn’t really be able to keep the product in the system long enough in order to get the benefit of using it. Replacing the seal may be your best option.
Thank you!
-BDP
Hi, I have an oil seep on my BMW X3. Not sure if it’s the oil pan, or rear main seal, but I used your product which has worked to stop the seep. My question is, will I be able to use this every oil change for the remaining life of the vehicle instead of replacing either the oil pan or rear main seal? Or will I eventually need to replace those parts?
Thanks!
MJ
MJ-
Thank you for asking about your BMW. We are happy to hear of the success you’ve had with the product! You should only need to use the product once, however, you are able to use the product as a preventative measure to help keep the seals/gaskets revitalized. This will help extend the life of the seals and prevent you from having to replace them down the road.
Thank you!
-BDP
I have a 1986 Buick grand national, will this product harm the turbo?
Daniel-
The BlueDevil Rear Main Sealer is 100% safe and compatible to use on your Buick Grand National. The product would not harm the turbo or the system in any way.
Thank you!
-BDP
Hi,
I have an Audi Q7 and just got it serviced, i was told the car has possible rear main seal leak, is your product good enough to repair the damage??
Laique-
Yes, the BlueDevil Rear Main Sealer is safe and compatible to use on your Audi Q7. As long as the leak isn’t more than seeping or lightly dripping, you would be a good candidate for the product. You should expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
Hi I have a 2011 chevy equinox and it is going through a lot of oil. There is no leaks on my driveway and me and my mechanic did not find any leaks by the engine or oil pan. It went through about 4 quarts of oil in 10 days. We have no idea were the oil is going. Does this sound like a rear main seal leak, and if so do you think your product could fix this issue.
Brian-
Thank you for asking about your Chevy Equinox. It does not sound like a rear main seal leak, as you would typically have oil leaking to the ground or onto the transmission from the backside of the engine. BlueDevil Oil Stop Leak is intended for leaks that are seeping or lightly dripping. Based on your description, it does sound as though you are losing oil a little too quickly for the product to be successful. Replacing the leaking component would be your best option.
Thank you!
-BDP
How long after an oil and filter change can I add it? I’ve gone 200 miles since the change. Also, with a 4.2 quart oil capacity, should use full 8oz bottle or about half?
Joe-
You would be fine to add the BlueDevil Oil Stop Leak to your existing oil. One 8 oz. bottle will treat 4-6 quarts of oil. You should expect to start seeing improvement after 100-200 miles of driving.
Thank you!
-BDP
i have a 1996 Chevy Silverado and i have a very small oil leak from my rear main i probably loose a quart of oil every month or too. I have though about sealers but I don’t want it to make the problem worse. if i did possibly try this how long would it work for? and could it possibly make the problem worse or harm the engine in anyway.
Charles-
The BlueDevil Rear Main Sealer is 100% safe and compatible to use in your Chevy Silverado. The product does not harden or thicken in anyway, so it would not cause any adverse effects. You should expect to start seeing results after 100-200 miles of driving. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
Hello–we are considering purchasing a Chevy Suburban. However, our mechanic found a slowl oil leak from the rear main seal. Specifically, after idling for about 5 hours it produced one drop of oil. This seems like the type of leak that could be fixed with the sealer rather than replacing the seal. What do you think?
thanks,
Andy
Andy-
Thank you for asking about your potential Chevy Suburban. Based on your description, the vehicle would be a great candidate for the BlueDevil Rear Main Sealer. You should expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
I have a 2016 Ford Fusion Ecoboost 2.0 i4 the rear main just start a slow drip and I’m wanting to use blue devil rear main sealer but want to make sure it won’t hurt my turbocharger
Billy-
The BlueDevil Rear Main Sealer is 100% safe and compatible to use in vehicles with a turbocharger. The product does not harden or thicken in anyway, so it would not cause any harm whatsoever.
Thank you!
-BDP