Solving a Rear Main Seal Leak

Rear Main Seal LeakSolving a rear main seal leak can be a frustrating and complicated experience.  Many times the mechanics quotes for getting a rear main seal fixed are so high that it seems a better option to drive the vehicle and just add oil regularly to keep your car running.  Driving a vehicle with an oil leak might not seem like it’s that bad of an idea, but it may have some unintended consequences.  While you are driving the leaking oil will be getting spread all over the bottom of your vehicle.  This includes your suspension components, exhaust pipe and any hoses or wires under your vehicle.  Spreading oil over your hot exhaust pipe is most importantly a fire hazard, but also can lead to unpleasant smells and smoke.  Also spraying oil on wires and electrical connections can lead to corrosion of the wire casing and cause a bad single at the connector.  Lastly, as the oil covers the underside of your vehicle it will allow road dust and grime to stick to anything and everything.  As days and weeks go by this grime will turn into a sticky sludge and make any maintenance you have to do on your brakes or suspension components much more difficult costing you time and money.

Just letting a rear main seal leak go is a poor option, even if you don’t intend on keeping your car for very long.  Rear main seal leaks usually allow a significant amount of oil to leak out accelerating the problems discussed above.  The rear main seal is the seal that goes around your crank shaft at the back of your engine where the transmission connects.  Your crankshaft is at the bottom of your engine just above the oil pan so its bearings can be easily lubricated by the oil there.  As the engine crank spins it splashes in the oil spreading oil around the inside of your engine making sure it stays lubricated.  This also means that the rear main seal is near the oil sitting in the bottom of your engine and gets constantly splashed as the crank turns.  This means that even a small break or crack in the rear main seal can allow a significant amount of oil to leak out of your engine.  As this oil leaks out it will cause the problems we already talked about but can also allow your engine oil level to get dangerously low very quickly.  A low oil level will mean the crank doesn’t splash the oil as well, or possibly even your oil pump running dry.

Parked Broken CarSince it is such a problem to drive with a rear main seal leak and it seems like an expensive problem to fix it can be tempting to simply park the car, and let it sit or sell it for next to nothing.  Either of these options would be unfortunate.  Simply parking a car because it has a problem like a rear main seal leak is a waste of resources.  No vehicle is every worth nothing, no matter what its condition it is in, but the longer it sits, the harder it can be to sell or fix.  Sitting cars can develop other problems like a dead battery, other oil leaks, flat tires and rust.  Selling a vehicle with a major problem can also be difficult as you have a very small audience that may be interested in it.

Solving your rear main seal leak may not be as difficult or as expensive as you thought.  The rear main seal in your vehicle can often develop a leak simply from sitting for too long, or just from being older.  The good news is that these seals can be reconditioned to their former size and shape rather than being replaced.  You can recondition the rear main seal in your vehicle and skip the repair costs associated with replacing it.  BlueDevil Rear Main Sealer is a specially designed additive that will recondition the rear main seal in your vehicle while you drive.  BlueDevil Rear Main Sealer does not contain any particulates or petroleum distillates that will harm any part of your engine.  It is so safe it can stay in your crank case oil until your next oil change.  We’re so confident in BlueDevil Rear Main Sealer that we guarantee it will seal your rear main seal leak.

BlueDevil Rear Main Sealer

Pick up BlueDevil Rear Main Sealer today directly from BlueDevil here: Rear Main Sealer, or from one of our partnering local auto parts stores:

  • Advance Auto Parts
  • AutoZone
  • 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 Distributer
  • DYK Automotive

Pictures provided by: www.hovermotorco.com and www.benzworld.com

 

154 responses to “Solving a Rear Main Seal Leak

  1. Just added rear main sealer to my dodge 2500 5.9 diesel its just seeping a little bit.
    How long can I leave the sealer in. I just changed my oil 200 mile ago. Will it do any damage to the engine if I leave it in for 2000 miles.

      1. My mechanics told me that additives meant to seal oil leaks only solve the problem for a short while because it expands the gaskets, but after awhile it starts weaken the density of the gaskets making them spongie. Causing and even more sever leak than before. Is this true?

        1. Jose-

          The BlueDevil Rear Main Sealer will revitalize and recondition the seal, and expand, or slightly swell it, back to it’s original state. The product would not over swell or over expand the rubber, making them spongie. 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

    1. Put 8 oz in and stopped the leak drove around for a week had oil changed and after 3 thousand miles still at full . this really works and saved me $1,100.00 as on a 79 Lincoln Mark v the engine has to be pulled to replace the rear main seal. This sealer is amazing!!!

      1. Dave-

        It is great to hear of the success you had with the BlueDevil Rear Main Sealer! Once the product seals, it creates a permanent seal, so you should be good to go at this point.

        Thank you!

        -BDP

  2. I had a rear main seal leak, after adding your product it stopped leaking. A week later it is leaking again…should I add another bottle?

      1. Mark-

        Thank you for asking about your Ford Ranger. Based on your description, we recommend using the BlueDevil Rear Main Sealer. You can expect to see results after about 100-200 miles of driving.

        Thank you!

        -BDP

          1. Zachary-

            For the valve stem seals, the product you would want to use is 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 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. You will not need to add both products at the same time.

            Thank you!

            -BDP

  3. I have a rear main seal leak in my 1983 camaro. I added a bottle of rear main seal to my oil. I ran the car for 15 minutes or so. It started smoking, smelled, and the cat was glowing red hot and smoking. Is this a characteristic of this product?

    1. Ed-

      The BlueDevil Rear Main Sealer will not ever run through your catalytic converter nor effect it in any way. The BlueDevil Rear Main Sealer specifically reacts with rubber seals/gaskets by reconditioning them. It usually takes about 100 miles of drive time before you obtain any result from the product.

      Feel free to contact us at 888-863-0426 and we would be happy to help troubleshoot the problem with you.

      Thank You!

      -BDP

  4. Hi my dealer told me that i had a leak in my oil pan but when i had my mechanic check it he said it looks like rear mail seal. With this product help all gaskets or just rear main seal thanks

    1. Oscar-

      We recommend adding 1 bottle of the BlueDevil Oil Stop Leak. This will seal leaks coming from various locations including the oil pan gasket and rear main seal.

      Thank You!

      -BDP

        1. Mike-

          It is possible to use both products at the same time but, not necessary. The BlueDevil Oil Stop Leak is a universal application, and would treat leaking oil pan gaskets, valve cover seal, rear main seal, etc., where as the Rear Main Sealer is specifically formulated for the rear main seal. If you are not 100% sure where the leak is coming from, or have multiple leaks, the Oil Stop Leak is the product you would want to use.

          Thank you!

          -BDP

  5. I have 1999 ford ranger. I don’t know if I have a oil pan leak or a rear main seal leak. Can I use a bottle of oil stop and a bottle of rear main sealer? Thanks

    1. Scott-

      If you are not sure where the leak is coming from then we recommend adding 1 bottle of the BlueDevil Oil Stop Leak. This will stop a leak from the oil pan gasket, valve cover seals, or the rear main. You should notice results after about 100 miles of driving.

      Thank You!

      -BDP

  6. I currently have Seafoam in the motor oil now. Is Blue Devil Rear Main Sealant safe to add to that same oil? Thank you.

    1. Kurt-

      We would recommend changing your oil prior to adding the BlueDevil Rear Main Sealer. Not knowing exactly what chemicals are used in Sea Foam, we wouldn’t advise mixing the two.

      Thank you!

      -BDP

        1. Shelley-

          Yes, you can use the BlueDevil Rear Main Sealer with UV dye in the oil. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

  7. I have a remanufactured 4.0 SOHC V6 with 3500 miles on it. It had a small leak from the initial break in at the rear of the engine, behind the transmission. Probably the main, but it could be the jack shaft cover. Without pulling the tranny, don’t know. The installer said it was the manufacturers problem and the warranty company said it was the installers fault. Even without knowing where the source is!!! 750 bucks just to pull the tranny to take a look-out of my frickin’ pocket. Your product reinvigorates old seals, as I understand it. Should I take a shot at using it for this type of problem? Thanks, I’m pretty P.O.ed right now.

    1. Dennis,

      Sorry to hear about all the problems you’re having with your car even with a new engine. I would recommend trying our rear main sealer. I’ve used it in my own cars, it won’t harm anything, and it comes with a money back guarantee so you’ve got nothing to lose. You can purchase BlueDevil Rear Main Sealer here: http://store.gobdp.com/rear-main-sealer-00234/

  8. I have a 96 ford f150 and have a rear main seal leak I put a bottle of blue devil rear main seal stop leak in it a week ago and it still leaks how long should it take to stop or do I add another bottle

    1. Ron-

      Typically, you would start to see results after 100-200 miles of driving with the BlueDevil Rear Main Sealer. Feel free to contact our technical support line at 888-863-0426 with any pertinent questions.

      Thank you!

      -BDP

  9. Hey so I just found out today that my engines main seal is leaking on my 99 Infiniti i30 and I just got my oil changed today as well so I can’t really add any of this blue devil product yet…should I wait for my oil levels to go low then fill it with the blue devil product or should I gradually do it over a few weeks or so?? The leak doesen’t seem to be too bad. Will I have any problems if I don’t seal it soon?? Thanks for the help!!

    1. Joaquin,

      It would be better to add BlueDevil Rear Main Sealer all at once. The bottle is less than half a liter so it shouldn’t affect your oil level significantly so you should be able to add it any time.

      Thanks again for your question!
      -BD Auto Pro

        1. Ora-

          No, the BlueDevil Oil Stop Leak would not work any more efficiently if added to low oil versus full capacity. The product should be added to the system and topped off with oil as needed, to ensure the oil is at the proper level for proper lubrication.

          Thank you!

          -BDP

  10. I just used your rear sealer product on my 05 BMW. The suspect is this case (I think) is the rear seal but could I also use you other oil stop leak with the rear sealer ? In other words can I combine both ?

    Best regards !

    1. Raphael-

      It is not necessary to add both products at the same time. It usually will take about 100 miles of driving before you start to see results.

      If it continues to leak after you have gone over 200 miles then please contact our tech support team at 888-863-0426.

      Thanks!

      -BDP

    1. Leland-

      Based on your description, the BlueDevil Rear Main Sealer may not work on your Ford Contour. The product is intended for leaks that are seeping or dripping out, not when it is apparent that you are losing a lot of oil. A part replacement may be the best remedy for your situation.

      Thank you!

      -BDP

  11. Should adding the Blue Devil Main Sealer cause the oil pressure to run lower than before adding. Idle oil pressure has reduced by 10psi 3 days after adding the product. Added on a 5.3 Chevy motor with 287,000 miles. Leak seems to be significantly reduced.

    1. Steve-

      The BlueDevil Rear Main Sealer will have no effect on the oil pressure. Leave the BlueDevil in your engine up until your next scheduled oil change. Once the oil is changed keep an eye on the oil pressure to see if it eventually restores to its normal pressure.

      Thank you!

      -BDP

  12. Just took my 04 f350 6.0 in an was told was leaking from oil pan and rear main seal was leaking….do you recommend giving blue devil a shot?

    Thank you

    1. Ricardo-

      Yes, we recommend using the BlueDevil Oil Stop Leak for you F-350. The Oil Stop Leak would be able to seal leaks coming from the oil pan gasket as well as the rear main seal. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

    1. Eric-

      The BlueDevil Rear Main Sealer can be used in diesel engines. As long as you are not losing oil too quickly, you should be able to see some good results from the product.

      Thank you!

      -BDP

  13. Hey I replaced my head gaskets on my 6.6 and noticed I had a small leak in my fuel line under my valve cover. I drove it and the diesel thinned out my oil. I came out the next morning and had oil all over my driveway. If I changed oil and added your product for rear main seal would it work

    1. Bobby,

      Thanks for your question about your Diesel truck. Depending how long you drove and what condition your rear main seal was is before, BlueDevil Rear Main Sealer may be able to seal your leak. Certain petroleum products (like diesel fuel) can quickly dissolve seals as the rubber they’re made out of is not designed to resist those chemicals. BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/) can revitalize and restore seals as long as there is enough of the seal left.

      Thanks again for your question!
      -BD Auto Pro

    1. Rik-

      Yes, we would recommend using the BlueDevil Rear Main Sealer on your Fiat. As long as you are not losing oil too quickly, the product should be able to help seal the leak. You should start to notice results after about 100-200 miles of driving.

      Thank you!

      -BDP

  14. A 2003 wind star- main rear seal& front seal& valve cover and oil pan is leaking. What should I use? The oil stop or rear main sealer? Can I use both?

    1. Grady-

      Based on your description, we would recommend using the Oil Stop Leak. The Oil Stop Leak is a universal application and would treat leaks coming from the oil pan gasket, rear main seal, valve cover gasket, power steering, transmission, etc. where as the Rear Main Sealer is specifically formulated for the rear main seal. If you are not losing oil too quickly, the Oil Stop Leak should be able to help seal all of these leaks. You should 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

  15. I have 2005 Honda Odyssey and added BD Rear Main Seal and gone 300 miles and slowed down a lot, but still see some spotting, will it continue to decrease over time or should I consider having it changed what do you recommend.

    1. Dale,

      Thanks for your question about your Honda Odyssey. Your leak should continue to get slower as time goes on as long as you don’t change your oil. If you do get an oil change, add BlueDevil Rear Main Sealer again to continue revitalizing that seal.

      Thanks again for your question!
      -BD Auto Pro

  16. I have a massey ferguson 135 and the rear main seal seems to be dripping oil how long would it take to stop leak and is it safe to put in tractor

    1. Brandon-

      BlueDevil Rear Main Sealer is 100% safe to use in your tractor. Once the product is added you can expect to start seeing results after 1 – 2 hours of run time.

      Thank you!

      -BDP

  17. I have a 2010 Volvo S80 4.4l V8 AWD. 311hp stock/340hp now. I have a Rear Main Seal leak, and just picked up a bottle of BlueDevil. It’s currently 20 degrees out, and my vehicle hasn’t been washed in a cpl weeks. Does it matter if the vehicle is dirty, what the weather is, etc.?

    1. PS – I ask because I need to wash my undercarriage & vehicle ASAP, but I’m not one of the fools that do it when its below freezing outside, and destroy my paint. I’m waiting .. but say I put BlueDevil in when I get home from work today, before running errands .. When I wash my car next week, & blast the undercarriage, is that going to effect it closing up that leak?

      1. Mike-

        Thank you for asking about your Volvo S80. Temperature and vehicle cleanliness will not hinder the effectiveness of the BlueDevil Rear Main Sealer. The product is only effecting the rubbers in the system, so cleaning the vehicle and blasting the undercarriage will not undo the seal that BlueDevil has created. Feel free to contact our technical support line at 888-863-0426 with any other questions.

        Thank you!

        -BDP

  18. I have a 97 ford ranger. The guy who put my fuel filter in says there is a bad rear main leak. A friend told me about this product type to seal the leak, but other people tell me that it will affect other parts on the truck causing problems. I am cautious about this. What can be some of the side effects or problems using this if any?

    1. Clarissa-

      There is absolutely no harm in using the BlueDevil Rear Main Sealer. The product doesn’t harden or thicken up in any way, so it would not have any kind of adverse affects on the system. The product is only affecting the rubbers in the system. It will revitalize and recondition them to get them back to their original state. Typically, you can expect 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

  19. Feb. 27 @ 6 pm 2016
    I have a 1993 Ford Explorer 4.0 . I was going through a quart of oil about every two days leaking from the rear main seal after putting your product in it stopped leaking oil but now it seems to be leaking a water substance from the rear main seal is that normal ? I have driven it for about 50 miles . Will this stop ?

    1. Jay-Are

      Thank you for asking about your Ford Explorer. The Rear Main Sealer would not have any affect on the water/cooling system. Are you getting water in your oil? Please contact our technical support line at 888-863-0426 so that we can assist you further.

      Thank you!

      -BDP

  20. I have a 97 Toyota Camry with a rear main seal leak I put the sealant in it two days ago it’s still dripping how long does it take to work and I keep having to put oil in my car it keeps getting low… how can I tell if the leak is too bad..?

    1. Sweet-

      Typically, you would start to see results after about 100-200 miles of driving. Please contact our technical support line at 888-863-0426 for further assistance.

      Thank you!

      -BDP

  21. Can you use the Rear Main Sealer product and the oil stop leak in the same oil treatment. Or should this be done in separate treatments?

    1. James-

      Thank you for your question. You could use the Rear Main Sealer and Oil Stop Leak in the same oil treatment, but it may not be necessary. The Oil Stop Leak is a universal application and will treat leaks coming from the oil pan gasket, valve cover gasket, rear main seal, etc. Where as the Rear Main Sealer is specifically formulated for the rear main seal. If you are not entirely sure where the leak is coming from or if there seem to be multiple leaks, the Oil Stop Leak is the product you would want to use. Feel free to contact our technical support team at 888-863-0426 with any other questions.

      Thank you!

      -BDP

      1. One last question. would you recommend doing a flush of the oil system (using a product to break up sludge) prior to a treatment?

    1. Jr-

      Yes, the BlueDevil Rear Main Sealer would work on your Ford F-350. The product will not harden or thicken in any way, so it would not have any adverse affects on the engine.

      Thank you!

      -BDP

  22. I have an 07 Chevy cobalt that I just noticed is leaking oil. I would say about a quart a week. My dad said he thinks it’s the rear main seal. Should I try your product?

    1. Alicia-

      Thank you for asking about your Chevy Cobalt. Based on your description, we would recommend using the BlueDevil Rear Main Sealer. You should expect to see results after about 100-200 miles of driving.

      Thanks again!

      -BDP

  23. Hello, I have a 2004 Suburban, a few thousand miles ago it developed a rear main seal leak. I stopped at the parts store and all they had was bars leak rear main seal repair. I used it and it worked. I am about to change the oil and picked up a bottle of blue devil because the bottle is small and won’t displace as much of the oil. Is it ok to use the blue devil as a preventative after using bars leak, are they compatable? The parts store guy said this was the best to use. Thank you.

    1. Dave-

      Thank you for asking about your Chevy Suburban. The BlueDevil Products are not compatible with Bars Leak, so we would not advise mixing the two. Are you still experiencing an oil leak? Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the situation and be able to make any appropriate recommendations.

      Thank you!

      -BDP

    1. Kathy-

      Typically, you should only have to add the product once. Once it seals, it would create a permanent seal. This is not the type of product that you would have to add with every oil change. Feel free to contact our technical support team at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  24. I’ve got an older 60s car with a rear main seal leak, it was sitting for a long time, how reliable is the sealant? I’m iffy about putting anything in there becuase it us quite expensive, either way, whether the sealant messes up the engine or to not use the sealant at all and swap the engine, either way it’d be pricey. Is it safe?

    1. Evan-

      BlueDevil Rear Main Sealer is 100% safe to use in your engine. Overall, the product carries a success rate of over 90% and will work by rejuvenating and slightly expanding the rubber rear main seal.

      Feel free to contact us at 888-863-0426 with any further questions.

      Thank you!

      -BDP

  25. Hi. I have a 2012 Audi Q5 which are known to develop main seal leaks. I’m told those seals are basically paper seals and the glue goes creating air leaks and also oil leaks. Would your product work for my vehicle and would be it good preventative action to put this in?

    1. Marc-

      BlueDevil Rear Main Sealer is specifically designed to work with rubber seals or gaskets. If the seal is made of a different material then this product would not have its desired affect on the seal(s). If you confirm that the seal is made of rubber then we would recommend using BlueDevil Rear Main Sealer in your Audi.

      Thank you!

      -BDP

    1. Jeff-

      It is not necessary to add both products at the same time. BlueDevil Oil Stop Leak is the universal application and would work to stop oil loss whether it is coming from the oil pan gasket, the rear main seal, valve cover gaskets, etc. Once you have added the product you can expect to start seeing results after about 100 miles of driving.

      Thank you!

      -BDP

  26. Hello,

    I just bought your rear main sealer for my classic car. In your instructions you discuss driving the car 100-200 miles to see the benefits of the Rear Main Sealer. Since I only drive about 25 miles per week, will your product work? Will I see results in approximately 4-8 weeks? Or would it be best to wait until I have an event where I might drive 100 miles all in one day? Thanks, Tom.

    1. Tom-

      Yes, the product will still work even if you only drive short distances each day. Keep in mind, it may take 4 – 5 days before you start to notice results if you are only driving 25 miles each day. It does not need to be driven on a constant 100 mile trip to obtain the desired results.

      Thank you!

      -BDP

  27. I used your blue devil head gasket to fix the blown head gasket in my 1999 Toyato Camry and once I fixed the head gasket I noticed I had a oil leak, not sure if its coming from the rear main seal or the oil pan gasket, but it only leaks while driving. Which one do I need to use the oil stop leak or the rear main sealer and will this work with your head gasket product?

    1. Kristy-

      Thank you for asking about your Toyota Camry. It is great that you had success using the BlueDevil Head Gasket Sealer! Based on your description, we recommend using the BlueDevil Oil Stop Leak. The Oil Stop Leak is the universal application and will work for oil pan leaks, rear main leaks, valve seal leaks, etc. Whereas the Rear Main Sealer is specifically formulated for the rear main seal. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then I recommend using BlueDevil Oil Stop Leak.

      Thank you!

      -BDP

  28. My toyota rav blows a puff of blue smoke when started each day and thereafter clears. Apparently this is due to hardened valve seals. If the car was not driven for 8 weeks, would the oil constantly drip through the seal, i.e. a big build up or does this just happen relative to the day it it has been driven? Would your blue devil help?

    1. Ruth-

      Thank you for asking about your Toyota Rav4. You could be losing oil even with the vehicle not being driven for 8 weeks. As long as you are not losing oil too quickly, you would be a good candidate for the BlueDevil Oil Stop Leak. The BlueDevil 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. You should expect to see results after about 100-200 miles of driving.

      Thank you!

      -BDP

  29. I have 1996 regal boat 5.0 volvo penta efi. There is oil leaking very badly ita more than dripping when running. Do you think this will work or can the leak be bad that it will not fix with this product. I believe it is leaking from the rear main seal. Thanks

    1. Mike-

      Thank you for asking about your Regal Boat. The BlueDevil Rear Main Sealer is intended for leaks that are seeping or lightly dripping from the rear main seal. Unfortunately, if you are losing oil too quickly, you would be losing the product just as quickly, and wouldn’t really be able to keep it in the system long enough in order to get the benefit of using it. Typically, you would start to see results after about 100-200 miles of driving.

      Hope this helps!

      -BDP

  30. I have a 66 Allis Chalmers HD3. Not sure what type of seal it is as I cant find a new one. Do you have any info into weather that will work in that crawler?

    1. Drew-

      Thank you for asking about your Allis Chalmers HD3. The BlueDevil Rear Main Sealer is only intended for rubber seals. If the crawler has paper, cork, rope or any other type of material seals, unfortunately, the product would not have any affect.

      Hope this helps!

      -BDP

  31. can blue devil rear main seal oil be used safely with full synthetic mobile 1 diesel oil for my 6.0 ford turbo diesel engine?
    Thanks

    1. Manny-

      Yes, the BlueDevil Rear Main Sealer is compatible with full synthetic mobile 1 diesel oil. You should expect to see results after about 100-200 miles of driving.

      Thank you!

      -BDP

  32. Hi,

    Finally receive my Pour & Go Head Gasket Sealer,
    i am not confident to finish pouring the whole 16oz bottle unless i drain off the coolant first.
    (If i idle the car at current condition, the coolant would overflow to the top within minutes)

    If i will to drain off the coolant at my mechanic place, then pour in the water + sealer.
    Drive 10min back to my house, then idle the engine with Heater@Max for another 40min when i reach my house.
    Will it be OK ?
    (The overheating usually happen after at least 15min with normal driving if the radiator is fully top-up)

    After drain-off, top-up should be:
    1. Sealer first, then water, re-install cap, then start engine, or
    2. Water first, then sealer, then top-off with water to the brim, re-install cap then start engine.

    Also,
    Any reason why the sealer must be pour in very slowly ?

    Thanks

    1. Tan-

      Depending on the cooling capacity of your vehicle you may not need the full 16 ounce bottle. You will first add water to your cooling system leaving enough room for the recommended amount of BlueDevil. Then, starting from a cold start, you will add the proper amount of BlueDevil Pour N Go Head Gasket Sealer through your radiator cap. Allow the engine to idle for 50 minutes (no driving) with the heater turned to the maximum setting.

      Thank you!

      -BDP

  33. I just add blue devil rear main sealer to my 2001 Nissan exterra I drove it for about 20 mins and now it leaks worse then before I added it. Do I have to drive it long at first or do I have to add another bottle.

    1. Josh-

      Once the product is added it will usually take about 100 miles of driving before you will start to see results. Continue to drive over the next few days and you will eventually see the leak slow down and then eventually stop.

      Thank you!

      -BDP

    1. Ron-

      No, this product will not harden or thicken at any point. BlueDevil Rear Main Sealer is 100% safe to use in your engine. The product works by slightly expanding rubber seals/gaskets and also reconditioning them.

      Feel free to contact us at 888-863-0426 with any further questions.

      Thank you!

      -BDP

    1. Jose-

      The BlueDevil Oil Stop Leak is a universal application and would treat leaking oil pan gaskets, valve cover seal, rear main seal, etc. Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the leaks your vehicle is experiencing and be able to make any appropriate recommendations.

      Thank you!

      -BDP

    1. Robert-

      The BlueDevil Rear Main Sealer is specifically formulated for the rear main seal and is only intended for rubber seals. Unfortunately, we do not manufacture a product for oil leaking from the head gasket. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  34. I just applied the blue devil rear main sealant.I drove the car a 96 toyota camry for about 25 minutes i was just wondering will the sealant leak out? Or does it automatically start working?thanks

    1. Stephanie-

      Thank you for asking about your Toyota Camry. Typically, you would start to see improvement after about 100-200 miles of driving. If you are losing oil so quickly that you would be losing the product before you get to 100-200 miles of driving, unfortunately, the leak you have may be a little larger than what the product is intended for. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  35. I put in the appropriate Blue Devil product to address the rear main seal, which has a slow leak in my 2002 Grand Cherokee. I was initially going to drive about 1200 miles, but that trip was postponed. I’m wondering whether the product will still work adequately if I let it sit for a week with only minimal driving? Or does the product gravitate toward the leak, and will leak out without sealing anything if the car isn’t driven? Also, will it work if I just let the car idle for a couple of hours? I got it specifically to stop staining the driveway, so I would prefer to just run the car at this point, if it will work that way.

    1. Iiro-

      Thank you for asking about your Grand Cherokee. In order to get the benefit of using the product, you would need to drive the vehicle. Typically, you would start to see results after about 100-200 miles of driving. It does not have to be a continuous drive. You are fine to drive in 5,10 mile intervals or drive it like you normally would. It would just be around the 100 mile mark before you would start to notice improvement. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  36. I have a 2007 5.3 Chevy motor that has a bad o-ring between the oil pump pick-up tube and the oil pump it self. On cold starts it is not able to build oil pressure at low RPMs (1500RPM and below) until the engine warms up to operating temperature. Once its at 210 deg it holds 60 psi perfectly. Will this Rear Main Sealer recondition internal o-rings and such or should I use Oil Stop leak?

    1. TJ-

      Based on your description, we recommend using the BlueDevil Oil Stop Leak. The Oil Stop Leak is a universal application, so it would treat leaking oil pan gaskets, 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

  37. I have Honda odyssey 07 it has 117 mils . it just start leak from back main seal I did add blue devil 00234 about 3 weeks ago so far did not work yat I drove it for 70 mils and it still leaking can you advise please
    thanks

    1. Gill-

      Generally you will see full results from BlueDevil Rear Main Sealer after driving somewhere between 100 – 200 miles total. Given that you have only driven about 70 miles since the product was added it is too early to tell if the product is going to work or not. Continue to drive the vehicle and keep us posted on how everything goes.

      Feel free to contact us at 888-863-0426 with any further questions.

      Thank you!

      -BDP

  38. Hi,
    I have a 2003 Acura MDX and the rear main seal is leaking. I put a bottle of Blue Devil rear main sealer in and the leak stopped for awhile but it’s starting to leak again. Should I add a second treatment?
    Also will this treatment help if the front engine seal is leaking also?
    thanks.

    1. Jay-

      Please give us a call at 888-863-0426 so that we can get an idea of approximately how long and for how many miles BlueDevil Rear Main Sealer has been in the system. Depending on how much you have driven since it was added it is possible that you have not obtained the full results yet.

      We look forward to speaking with you.

      Thank you!

      -BDP

    1. Fu-

      Yes, we recommend applying BlueDevil Oil Stop Leak to stop the oil loss from your cam seal. You should apply 1 ounce of BlueDevil per every 1 quart of capacity. Expect to start seeing results after approximately 100 miles of driving.

      Thank you!

      -BDP

  39. i have a 2004 for f150 with a small oil leak at the rear of the engine. I changed oil about a month ago and have about 400 miles on the new oil. is it ok to put the blue devil treatment in now or should I wait when I change oil the next time.

    1. Norman-

      Thank you for asking about your Ford F-150. You would be fine to add the product to your existing oil. Typically, you should expect to see results after about 100-200 miles of driving. The product can stay in the oil for the life of the oil, so it does not have to be changed out immediately after results are achieved. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  40. Hi,
    I have a similar situation to Jay above: I have a 2002 Honda Odyssey with with a moderately slow rear mail seal leak. I added a bottle of Blue Devil rear main sealer with a fresh oil change and the leak stopped within 5 days, but started leaking again 1200 miles/3-months later. The treatment is still in the oil. Would a second treatment stop the leak?
    Thanks – Steve

    1. Steve-

      Thank you for asking about your Honda Odyssey. Based on your description, we do recommend a second application of the BlueDevil Rear Main Sealer. Please contact our technical support line at 888-863-0426 so that we may assist you in receiving a replacement bottle.

      Thank you!

      -BDP

  41. Hey my tran pan an other places under the car has a lot of oil on it I kno I have a rear main seal leak would blue devil be my answer

    1. Brian-

      Yes, we recommend adding 1 bottle of BlueDevil Rear Main Sealer. You can expect to start seeing results after approximately 100 miles of driving.

      Thank you!

      -BDP

  42. good day there I wanna know can I mix BlueDevil Oil Stop Leak 49499 with BlueDevil Rear Main Sealer I just did oil change and I add rear main sealer first but I didn’t work mechanic tolled me is the oil pan leaking not rear seal so can I just add 49499 I don’t wanna to waist my oil
    thanks

    1. Gill-

      Yes, you may add the BlueDevil Oil Stop Leak to the oil you currently have in the system. If you have driven the vehicle over 200 miles with the Rear Main Sealer, you would not be getting additional benefit from the product at this point, and would safely be able to add the BlueDevil Oil Stop Leak.

      Thank you!

      -BDP

        1. Gill-

          BlueDevil Rear Main Sealer works by reconditioning and rejuvenating the rubber seals and gaskets within the fluid oil system so if a gasket is not present then the product will not be effective. It sounds like you are experiencing a leak that is of a different nature than what BlueDevil is designed to fix.

          Thank you!

          -BDP

  43. Hi! I have a 1989 VW Jetta 1.6 diesel and it has a rear main oil leak, I have ordered blue devil rear main seal ER will it work on my vw..

    1. Uday-

      Yes, the BlueDevil Rear Main Sealer is safe and compatible to use on your VW Jetta. You should expect to see results after about 100-200 miles of driving.

      Thank you!

      -BDP

  44. I have a 2007 for fusion that is leaking oil between the transmission and the engine and I was wondering what product to use? I bought the blue devil rear main sealer . Is that fine to use ?

    1. Lucia-

      Thank you for asking about your Ford Fusion. The Oil Stop Leak is a 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.

      Thank you!

      -BDP

  45. Hi! I pour 8oz of blue devil rear main sealer and still having some leak between the engine and the tranny. I’m thinking to add another 8oz of blue devil but the guy from auto zone told me to do some research first. The blue devil has been sitting inside my engine for like 2000 miles.. Is it safe to pour another bottle? I’m not sure where this leak are coming from I assumed rear main seal..Thanks.

    1. Res-

      Please contact our technical support line at 888-863-0426 so that we may assist you in receiving a replacement bottle. If the leak is coming from somewhere other than the rear main seal, unfortunately, the BlueDevil Rear Main Sealer would not be helpful. If that is the case, the BlueDevil Oil Stop Leak is a universal application and would treat leaking oil pan gaskets, valve cover seals, rear main seals, etc.

      Thank you!

      -BDP

  46. I have 3 vintage cars, (1) 1936 Chevrolet overhauled in 1971, with 2000 miles since. The rear main appears to be made of rubber. will the rear main sealer seal other leaks. (2) 1953 Ford with 8BA engine seems to have slight oil pan leak and small front engine leak. (3) 1957 Chevrolet SBC 400, several small annoying leaks. Would you use the same product on all three.
    Thanks

    1. John-

      Thank you for asking about your vintage automobiles! Based on your description, the BlueDevil Oil Stop Leak would help seal the leaks for all three vehicles mentioned. The BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/) 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 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. You will not need to add both products at the same time.

      Thank you!

      -BDP

  47. Hi –

    Is it OK to add BD Oil Stop Leak to an engine that already has a high mileage synthetic oil? As, I understand the high mileage oil already has additional additives in it.

    Thanks,
    Greg

    1. Joe-

      Yes, the BlueDevil Rear Main Sealer is safe and compatible to use on your Cummings Diesel engine. You will use one oz. of the product per quart of oil in the system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  48. I have a 1999 Nissan Maxima that had a rear main seal leak. I used Blue Devil rear main sealer. It stopped the leak for about a month. The has comeback worse than before. Any ideas on what to try next?

    1. Biobob-

      Thank you for asking about your Nissan Maxima. Once the product seals, it would be a permanent seal. Please contact our technical support line at 888-863-0426 so that we can discuss the vehicle in a little more detail and assist you with a possible replacement bottle.

      Thank you!

      -BDP

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