How to Fix a Differential Leak

#driveyourlife

Differential leakA differential leak is not an uncommon leak on many vehicles equipped with a differential.  But how do you know if your vehicle has a differential?  It used to be as easy as saying that if you drive a truck or SUV your vehicle has one, and if not, your vehicle doesn’t but today’s advanced engines and drivetrains, it’s best to take a peek under your vehicle and identify the differential before diagnosing the problem.

What is a Differential?

The differential in your vehicle accomplishes a variety of tasks all in a small space.  The main purpose of the differential in your vehicle is to multiply the power transmission devices.  Your vehicle has just one engine but must drive 2 or 4 wheels with that engine.  Most four-wheel drive vehicles have a front and rear differential. For vehicles that are front wheel drive, the multiplication happens inside the transmission, which can technically be called a transaxle.  A transaxle takes one input from the engine and turns it into 2 outputs, one to each of your front wheels.

In the case of a 2-wheel drive vehicle that is rear wheel drive, power exits the transmission through the driveshaft and the driveshaft provides a single input into a differential.  Inside the differential that single power input is split into two shafts, the axles, to supply power to both rear wheels.  If your vehicle is 4-wheel drive, then you’ll have a transfer case after the transmission that splits power into a front and rear driveshaft which each supply power to their own differential.

The differential in your vehicle also provides another important drivetrain feature and that is providing the final drive ratio.  Even with the gear reduction in your transmission, the driveshafts in your vehicle are spinning very quickly so you need one final gear reduction to reduce the speed.  Differentials can reduce the driveshaft speed by half, ¾ or even up to 1/6 of the speed!

The speed reduction and shaft multiplication that happens in your differential requires a specific type and set of gears to correctly change the shaft speed, multiply it into 2 outputs and don’t forget, transfer the power at a right angle!  This requires a ring gear, pinion gear, spider gears and carriers to support them.

This set of gears requires specific types of lubricants to make sure things stay cool during normal operation and that wear is kept to a minimum.  Along with the gear set, very specific bearings are used to carry the loads on the shaft and keep the gears at exact distances from each other so the gear teeth can engage properly.  Like any lubrication, there are seals to keep the lubricants from running out of your differential.  Some differentials put these seals just outside the bearings, while others have the seals all the way at the end of the axle tube.  Due to different designs, your differential can leak from many different places making it difficult to determine the exact leak location. However, many people find that rear differential leaks are the most common.

Rather than searching for where your leak is coming from, simply add BlueDevil Oil Stop Leak to your differential oil through the oil fill plug and your leaking seal will be reconditioned and restored while you drive!

For more information about BlueDevil Oil Stop Leak and how to seal your differential leak, click on the banner below!
BlueDevil Oil Stop Leak

 

 

 

 

 

You can purchase BlueDevil Oil Stop Leak at any of our partnering local auto parts stores like:

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Pictures Provided By:

differntial_leak.jpg – By Loraks – 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.

152 responses to "How to Fix a Differential Leak"

152 Comments

  1. Jerry funches jr on March 21, 2018 at 12:43 pm

    Will it lock up rear end

    • BlueDevil Pro on March 21, 2018 at 12:56 pm

      Jerry-

      No, the product does not harden or thicken in any way, so it would not cause any adverse affects in the system. Feel free to contact our technical support office at 888-863-0426 with any other questions.

      Thank you!

      -BDP

      • Larry May on October 17, 2018 at 6:57 pm

        will this work in the front differential of a 2002 chevy tracker that has the “vacuum” type 4×4 differential locking system or will this screw up this system. The right oil seal leaks where the CV axle enters the differential housing.

        • BlueDevil Pro on October 18, 2018 at 9:46 am

          Larry-

          Yes, the BlueDevil Oil Stop Leak would seal the leak you have described on your Chevy Tracker. You will use one oz. of the product per quart of fluid in the system, and should expect to start seeing results after approximately 100-200 miles of driving.

          Thank you!

          -BDP

          • Larry on October 29, 2018 at 3:01 pm

            This differential has a rubber hose within the differential for thr four wheel drive engagement system. Will the blue devil effect this hose?



          • BlueDevil Pro on October 30, 2018 at 10:08 am

            Larry-

            No, the BlueDevil Oil Stop Leak would not adversely affect the rubber hose within the differential.

            Thank you!

            -BDP



          • Adam on May 24, 2023 at 9:25 pm

            Would the rear main seal stop leak work in the diff.



          • BlueDevil Pro on May 25, 2023 at 8:45 am

            Adam-

            The best product to use for a leaking differential is the BlueDevil Oil Stop Leak. The Oil Stop Leak is a universal application, and is the more concentrated of the two. You would use one oz. of the product per quart of fluid/gear oil.

            Thank you!

            -BDP



          • Rose on October 11, 2023 at 5:30 pm

            lcan you add this oil yourself on fro t dirrential and where do you add oil



          • BlueDevil Pro on October 12, 2023 at 9:45 am

            Rose-

            Yes, you may use the BlueDevil Oil Stop Leak for a leaking differential. You would use one oz. of the product per quart of fluid, and the product would be added directly into the differential fluid. You should expect to start seeing results after 100-200 miles of driving.

            Thank you!

            -BDP



        • Nick Rigby on June 24, 2021 at 4:11 am

          Hi
          Have a 2006 Subaru Forester with a leaking front differential. Would this product be the one to use and if so, can you tell me the exact product name I need to look for

          Thanks

          • BlueDevil Pro on June 24, 2021 at 8:18 am

            Nick-

            Thank you for asking about your Subaru Forester. The BlueDevil Oil Stop Leak would be the best product to use for your leaking front differential. You will use one oz. of the product per quart of fluid. Expect to start seeing results after 100-200 miles of driving.

            Thank you!

            -BDP



      • Michael H on September 15, 2021 at 9:43 pm

        Just installed a new FEL-PRO Gasket (AAM Axle; Paper Type; w/ 8.5″ Ring Gear; w/ 10 Bolt Holes) on the rear of my 98 chevy suburban k1500 hoping to fix a leaking differential. Still leaking. Will Blue Devil Pro seal a leak with this set up?

        • BlueDevil Pro on September 16, 2021 at 9:26 am

          Michael-

          Thank you for asking about your Chevy Suburban. The BlueDevil PRO Universal Leak Repair works by revitalizing/reconditioning rubber seals and gaskets. The product does not harden or thicken in any way. It would not fill in a hole or “plug” in a gap. Based on your description, reinstalling the gasket may be your best option.

          Thank you!

          -BDP

        • Beth on March 9, 2023 at 9:11 am

          I have a 2005 Chevy Colorado that’s leaking from the rear differential if I use this blue devil will it stop the leak and if so how do I put it in and where

          • BlueDevil Pro on March 9, 2023 at 10:20 am

            Beth-

            Thank you for asking about your Chevy Colorado. Yes, the BlueDevil Oil Stop Leak would be able to treat a leaking rear differential. You would use one oz. of the product per quart of fluid. The product would need to be added directly to your differential fluid. You should expect to start seeing results after 100-200 miles of driving.

            Thank you!

            -BDP



    • Cayden Minick on January 24, 2019 at 10:52 am

      would this stop leak on front differential pinion seal

      • BlueDevil Pro on January 24, 2019 at 1:23 pm

        Cayden-

        Yes, BlueDevil would be able to seal a differential pinion seal leak. You will use one oz. of the product per quart of fluid in the system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

        Thank you!

        -BDP

        • Al Doody on September 15, 2020 at 3:33 pm

          I have a leak around my drive axle front differential around the RTV seal will Blue Devil stop from leaking I have a very slow wet leak it just started in the differential Kenworth T680 front drive axle
          Also that T680 differential is 5 gallons or 20 quarts how much would I need to use if it would work thanks Al

          • BlueDevil Pro on September 16, 2020 at 8:27 am

            Al-

            Unfortunately, we do not manufacture any products that are designed to work on RTV-type seals. Our product works exclusively on rubber seals/gaskets. Replacing the seal may be your best option.

            Thank you!

            -BDP



        • Don P. on December 18, 2021 at 12:40 pm

          I have a jeep commander and the rear pinion seal is leaking. Not too bad.
          It is a Quadra II.
          So it’s all wheel. Plus, it had a slip additive in it.
          Will your product be alright to use with it ?
          Thanks

          • BlueDevil Pro on December 20, 2021 at 8:17 am

            Don-

            Yes, the BlueDevil Oil Stop Leak is 100% safe and compatible to use in your Jeep Commander. You will use one oz. of the product per quart of fluid. Expect to start seeing results after 100-200 miles of driving.

            Thank you!

            -BDP



        • Phil Stoloff on November 28, 2022 at 1:37 pm

          Hi folks!
          Hope all is well. I have a 1979 Toyota Land Cruiser fj40.
          The front differential has a slight leak, I was able to turn the lower bolt which was oil coated about a little more than 1/4 turn, all the other bolts would not budge.
          Should I just wait and see if this tightened the seal better?
          Thanks so much for your advice.

          • BlueDevil Pro on November 29, 2022 at 9:26 am

            Phil-

            Thank you for asking about your Toyota Land Cruiser. Based on your description, it sounds like tightening the bolt would have solved the problem. You can try taking it for a test drive and engaging the differential during the drive to test your theory. If it continues to leak, you may be a good candidate for the BlueDevil Oil Stop Leak. Feel free to contact our technical support line at 888-863-0426 with any questions.

            Thank you!

            -BDP



  2. Bobby on May 12, 2018 at 10:14 pm

    Does your sealer have a money back guarantee

    • BlueDevil Pro on May 14, 2018 at 8:36 am

      Bobby-

      Yes, all of our products carry a money-back guarantee.

      Thank you!

      -BDP

  3. William Pullen on May 13, 2018 at 11:24 am

    Have very slow axle seal leak on rear differential on a 2013 Toyota Tundra. In fact leak must of just started because pulling off passenger side disc caliper to adjust emergency brake shoes noticed emergency brake shoes were damp with rear end grease but not dripping out of emergency brake drum. Question is will this product help & how should I use it far as how much compared to the amt of diff. fluid in diff. Also will it be compatiable with the synthtic fluid Toyota put into it 10,000 miles ago.
    Thanks, William Pullen

    • BlueDevil Pro on May 14, 2018 at 9:06 am

      William-

      Thank you for asking about your Toyota Tundra. Based on your description, we recommend using the BlueDevil Oil Stop Leak (https://store.gobdp.com/oil-stop-leak-49499/). You will be using one oz. of the product per quart of fluid in the system. Yes, the product is compatible with synthetic differential fluid. You should expect to see results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

      • Adam on May 21, 2018 at 9:04 am

        Can you use the rear seal stop leak in the rear differential also?

        • BlueDevil Pro on May 21, 2018 at 12:22 pm

          Adam-

          For a rear differential leak, 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 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. You should expect to see results after approximately 100 miles of driving.

          Thank you!

          -BDP

          • Adam on May 30, 2018 at 12:43 pm

            I put 8oz of the oil stop leak in before I left to go work out of town drove it about 100 miles and it was still leaking out of the hub before I left



          • BlueDevil Pro on May 30, 2018 at 1:39 pm

            Adam-

            100 miles of driving, with the product added, would be the point where you would start to notice improvement. Depending on the size of the leak, it may take up to around 200 miles before you see the full benefit of the product. If the leak persists, please contact our technical support line at 888-863-0426.

            Thank you!

            -BDP



          • Anthony on January 9, 2023 at 2:59 pm

            My 2017 Jeep Wrangler has developed leaking front axle seals. Will your product stop the leak?



          • BlueDevil Pro on January 10, 2023 at 8:45 am

            Anthony-

            Yes, the BlueDevil Oil Stop Leak would be able to treat the front axle seals on your Jeep Wrangler. You should expect to start seeing results after 100-200 miles of driving.

            Thank you!

            -BDP



      • Larry Kaprielian on July 4, 2022 at 11:23 am

        Have a 2010 RXV EZGO golf cart. Have a slow leak on the differential. Uses 85 140 oil, would you recommend pulling that cover and resealing or add the Blue Devil. Cart’s been sitting for about 4 years. What would you recommend 1 oz . Thank you so much for all you do.

        • BlueDevil Pro on July 5, 2022 at 12:08 pm

          Larry-

          Based on your description, we would recommend trying the BlueDevil Oil Stop Leak for your golf cart’s differential leak. You would use one oz. per quart of oil capacity. Expect to start seeing results after 1-2 hours of operation.

          Thank you!

          -BDP

      • Sandra on March 8, 2023 at 3:42 pm

        Got oil change 2 wks.ago saysoilpan leak and ront n rear diffrential leas does blue devil help?

        • BlueDevil Pro on March 9, 2023 at 10:13 am

          Sandra-

          Yes, the BlueDevil Oil Stop Leak would be able to treat leaking oil pan gaskets and leaking rear differential seals. You would add the product into the engine oil and differential fluid to treat both leaks. One 8 oz. bottle would treat 4-6 quarts of motor oil. You would use one oz. of the product per quart of fluid in the differential.

          Thank you!

          -BDP

    • Rick on August 26, 2022 at 12:41 pm

      Right rear axle seal on 2009 CTS has a slight leak. Will this work?

      • BlueDevil Pro on August 29, 2022 at 8:33 am

        Rick-

        The BlueDevil Oil Stop Leak would work for a leaking right rear axle seal. You will use one oz. of the product per quart of oil in the system. You should expect to start seeing results after 100-200 miles of driving.

        Thank you!

        -BDP

  4. James Sempirek on May 29, 2018 at 10:47 am

    How much Blue Devil do you use in front differential

    • BlueDevil Pro on May 29, 2018 at 10:51 am

      James-

      Use about one oz. of the product per quart of fluid in the system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  5. Steve on July 2, 2018 at 9:07 am

    I have a Toyota Tacoma that is leaking around the differential housing,will your product seal that leak or do I need to change the gasket?
    Thank you Steve

    • BlueDevil Pro on July 2, 2018 at 9:23 am

      Steve-

      Thank you for asking about your Toyota Tacoma. The BlueDevil Oil Stop Leak would be able to seal a leaking differential. You will be using one oz. of the product per quart of fluid in the system and should expect to see results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  6. Jay on August 4, 2018 at 8:26 am

    My rearend in my dodge is going bad can I put blue devil in rearend

    • BlueDevil Pro on August 6, 2018 at 9:27 am

      Jay-

      Is your Dodge losing oil from the rear differential? 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

  7. Todd Thornton on August 28, 2018 at 12:38 pm

    I have a 2003 Dodge Ram 2500 with a leaking rear differential. However it’s leaking from the INSIDE,not at the gasket.
    I’ve been using high temperature epoxy on the outside and checking the fluid once a week but that’s a real pain.
    Will your product work for this?

    Thank you!!

    • BlueDevil Pro on August 28, 2018 at 3:57 pm

      Todd-

      Thank you for asking about your Dodge Ram 2500. The BlueDevil Oil Stop Leak works by revitalizing and reconditioning rubber seals/gaskets. If that is indeed where the leak is coming from, you would be a good candidate for the product. You will use about one oz. of the product per quart of fluid in the system.

      Thank you!

      -BDP

  8. Nick on September 25, 2018 at 2:36 am

    I have a ford expedition 98. 4WD. With a leak in differential. Help!

    • BlueDevil Pro on September 25, 2018 at 9:12 am

      Nick-

      Thank you for asking about your Ford Expedition. For a differential leak, we recommend the BlueDevil Oil Stop Leak (https://store.gobdp.com/oil-stop-leak-49499/). You will be adding one oz. of the product per quart of oil in the system, and should expect to see results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  9. Richard R LeClair on September 28, 2018 at 1:42 pm

    looking for the right sealer for a differential

    • BlueDevil Pro on October 1, 2018 at 9:19 am

      Richard-

      The BlueDevil Oil Stop Leak (https://store.gobdp.com/oil-stop-leak-49499/) would be great for stopping your differential leak. You will use one oz. of the product per quart of fluid in the system, and should expect to see results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

      • Zachary Palermo on May 16, 2020 at 4:39 pm

        I have a 2003 ford deisel 4×4 my rear differential is leaking somewhere I already replace pan seal but there’s fluid all over rear end and bottom of bed. What can I do. To fix it

        • BlueDevil Pro on May 18, 2020 at 9:56 am

          Zachary-

          The BlueDevil Oil Stop Leak would be able to seal the leaking rear differential on your Ford Diesel. You will use one oz. of the product per quart of fluid in the system, and should expect to start seeing results after 100-200 miles of driving.

          Thank you!

          -BDP

  10. Barry on November 3, 2018 at 11:18 pm

    I have a leaking rear differential around a couple of gaskets on a 2010 4×4 Golf Cart. Is BlueDevil Oil Stop Leak safe for a golf cart differential?

    • BlueDevil Pro on November 5, 2018 at 10:44 am

      Barry-

      Yes, the BlueDevil Oil Stop Leak is safe and compatible to use for the differential leak on your Golf Cart. You will be using one oz. of the product per quart of fluid in the system. You should expect to see results after approximately 1-2 hours of operation.

      Thank you!

      -BDP

  11. Derek Franklin on November 17, 2018 at 3:55 am

    i have a 02 dodge ram and its leaking oil at the pinion seal on the rear differential will this work

    • BlueDevil Pro on November 19, 2018 at 9:16 am

      Derek-

      Yes, the BlueDevil Oil Stop Leak would be able to treat the leak you have described on your Dodge Ram. You will be using one oz. of the product per quart of oil in the system, and should expect to start seeing results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  12. Alec on November 28, 2018 at 8:09 pm

    The rear differential of my 2011 Ford Escape was leaking before and after I changed the gear oil, replaced the gasket, and reopened the vent. But it’s all good now. I put 1oz of Oil Stop Leak in and after driving about 120 miles, I noticed the leak was gone. A $20 fix to a $600 quote to replace my axle seals. Thanks!

    My question is: I have an extra 7oz left in the bottle. Can I add it to my engine/transmission oil as prevention? There are no leaks in those that I notice but I’d like to keep it that way.

    • BlueDevil Pro on November 29, 2018 at 9:16 am

      Alec-

      We are happy to hear of the success you’ve had with the BlueDevil Oil Stop Leak in your Ford Escape! Yes, Oil Stop Leak can be utilized as a preventative maintenance, to keep the rubber seals/gaskets strong and help them from deteriorating. The product does not harden or thicken in anyway, so it would not cause any adverse affects to the engine.

      Thank you!

      -BDP

  13. Richard Dee Westfall on April 21, 2019 at 9:35 pm

    I have a differenl gasket leak on my dump truck will this work on a gasket leak?

    • BlueDevil Pro on April 22, 2019 at 11:34 am

      Richard-

      Yes, the BlueDevil Oil Stop Leak would treat a leaking differential. You would use one oz. of the product per quart of oil in the system, and should expect to start seeing results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  14. Anthony Smith on May 7, 2019 at 7:21 pm

    I have a rear axil seal leaking on my tractor… will your product work on that?

    • BlueDevil Pro on May 8, 2019 at 9:16 am

      Anthony-

      Yes, the BlueDevil Oil Stop Leak would treat the leaking rear axel seal on your tractor. 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

  15. Andre Brink on May 18, 2019 at 5:36 am

    Is this product compatible with limited slip differentials?

    • BlueDevil Pro on May 20, 2019 at 9:01 am

      Andre-

      Yes, BlueDevil Oil Stop Leak is safe and compatible to us in vehicles with a limited slip differential. You should add 1 ounce of BlueDevil per every 1 quart of fluid capacity. Expect to start seeing results after approximately 100 miles of driving.

      Thank you!

      -BDP

  16. Matt brown on June 2, 2019 at 1:48 am

    Would a front differential leak cause a puff of smoke out the exhaust every once In a while?

    • BlueDevil Pro on June 3, 2019 at 11:05 am

      Matt-

      What color is the smoke out of the exhaust? A front differential leak would not cause smoke/steam out of the exhaust. 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

  17. Jeffrey Butler on June 2, 2019 at 3:15 pm

    Dodge Ram Rear wheel seal leaking, if added to differential , will it help stop seal leak?

    • BlueDevil Pro on June 3, 2019 at 11:13 am

      Jeffrey-

      Yes, the BlueDevil Oil Stop Leak would be able to treat the leaking differential on your Dodge Ram. You will be using one oz. of the product per quart of oil in the system, and should expect to start seeing improvement after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  18. Tony on July 15, 2019 at 11:04 am

    The rear differential fluid just started leaking on my 2007 Nissan Armada.I took it to the mechanic and they said the gaskets are worn out. They said it is a big job to replace the gaskets. I wanted to know if the Blue Devil Oil stop leak can work for this issue or do I have to take it to the mechanic to repair.

    Thank you

    • BlueDevil Pro on July 15, 2019 at 11:46 am

      Tony-

      Yes, the BlueDevil Oil Stop Leak would be able to treat the leaking differential on your Nissan Armada. You will use one oz. of the product per quart of fluid capacity, and should expect to start seeing improvement after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  19. Retha on July 22, 2019 at 10:08 am

    Will it also work if the housing is leaking

    • BlueDevil Pro on July 22, 2019 at 11:12 am

      Retha-

      The Oil Stop Leak would only have an affect on rubber seals/gaskets. Unfortunately, it would not work on the housing itself.

      Thank you!

      -BDP

  20. TMWelch on July 26, 2019 at 6:54 am

    2009 Jeep Liberty- rear differential was replaced last year, now leaking – will your product stop the leak?

    • BlueDevil Pro on July 26, 2019 at 9:13 am

      TMWelch-

      Thank you for asking about your Jeep Liberty. As the long as the leak isn’t more than seeping or lightly dripping from the rear differential, you would be a good candidate for the BlueDevil Oil Stop Leak. You will use one oz. of the product per quart of oil in the system, and should expect to start seeing improvement after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  21. Keith Smith on August 5, 2019 at 1:47 am

    Can your product be used in a tractor with a wet clutch? Oil leak in diff housing shared with clutch and hydraulic system.

    • BlueDevil Pro on August 5, 2019 at 9:44 am

      Keith-

      Yes, the product would be safe to use in your tractor with a wet clutch. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  22. Harald Weldon on October 28, 2019 at 10:06 am

    Have added 2 ounces of Blue devil to stop the leak on my 83 EL Camino the leak is from the pinon I have not yet driven a full 100 to 200 miles and am monitoring the amount of leakage if a should need to add more oil can I also add more Blue devil along with it?

    • BlueDevil Pro on October 28, 2019 at 12:13 pm

      Harald-

      Thank you for asking about your El Camino. You can top it off with power steering fluid as needed, however, you wouldn’t be adding a second application of the product until around 200 miles of driving. As long as the leak isn’t more than a seep or light drip, the product should be able to seal.

      Thank you!

      -BDP

      • Harald K Weldon on November 12, 2019 at 12:07 pm

        in your reply you mentioned power steering fluid , I suspect you actually meant rear differential oil?

        • BlueDevil Pro on November 12, 2019 at 1:55 pm

          Harald-

          Apologies, we did mean differential oil.

          Thank you!

          -BDP

  23. tim on May 7, 2020 at 1:50 pm

    i have a 99 4runner with a rear differential leak. I suspect multiple pinholes from rust as it is a welded rear cover. will your product seal the leaks without causing gear damage?

    • BlueDevil Pro on May 7, 2020 at 3:39 pm

      Tim-

      Thank you for asking about your Toyota 4Runner. The BlueDevil Oil Stop Leak would work well to stop the pinhole leaks on the rear differential. The product does not harden or thicken in anyway, so it would not cause any harm. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  24. Benjamin Smith on May 15, 2020 at 1:55 am

    How much MLS do I need for a Nissan Navara axle seal think it holds 2litres of oil in it . What product

    • BlueDevil Pro on May 15, 2020 at 12:00 pm

      Benjamin-

      The BlueDevil Oil Stop Leak would be an excellent choice to stop the axle seal leak on your Nissan Navara. You will use one oz. of the product per quart of fluid in the system, and should expect to start seeing improvement after 100-200 miles of driving.

      Thank you!

      -BDP

  25. Carolyn G on May 28, 2020 at 4:57 pm

    Will this work if the inner housing seal is leaking on a 2001 Ford F-250?

    • BlueDevil Pro on May 29, 2020 at 9:24 am

      Carolyn-

      Yes, the BlueDevil Oil Stop Leak would be able to treat the leak you’ve described on your Ford F-250. You will use one oz. of the product per quart of oil in the system, and should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  26. Anthony j on June 21, 2020 at 7:47 pm

    I have a 1988 ranger and replace the gasket 4 times on my rear differential and with the oem gasket as well and it’s still leaking looks like it’s coming my yolk where the pinion is at will this work for this problem

    • BlueDevil Pro on June 23, 2020 at 10:10 am

      Anthony-

      Thank you for asking about your Ford Ranger. Based on your description, we would recommend using the BlueDevil Oil Stop Leak. You will use one oz. of the product per quart of oil in the system. You should expect to start seeing results after approximately 100-200 miles of driving.

      Thank you!

      -BDP

  27. Badu fall on June 26, 2020 at 5:51 pm

    I have a 2016 LR discovery Sport and just found out that my front differential is leaking.

    • BlueDevil Pro on June 29, 2020 at 9:23 am

      Badu-

      Thank you for asking about your Land Rover Discovery. The best product to use for your leaking front differential is the BlueDevil Oil Stop Leak. You will use one oz. of the product per quart of fluid in the system, and should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  28. STEVEN SETON on June 28, 2020 at 9:16 am

    Hi Blue Devil, i had fantastic results with the stop engine leak, i have a 2004 holden adventra with a LS1 engine, oil was weeping from the front engine seal , now it doesn’t.. now i have a weep from my front diff, can i put rear main seal additive into the front diff?.. if so ,how much, it runs 80/140 gear oil.

    Cheers Steve

    • BlueDevil Pro on June 29, 2020 at 10:44 am

      Steve-

      We are happy to hear the results you have had with the BlueDevil Oil Stop Leak. For your front differential leak, we’d actually recommend the Oil Stop Leak for that as well. You will use one oz. of the product per quart of fluid in the system. You should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  29. John Gaston on July 4, 2020 at 2:29 pm

    Have a 2002 Chevy avalanche with rear differential that has an oil drain plug in the bottom of the casting that is leaking oil. I checked the plug for being loose–found it loose, tightened it to a reasonable amount, cleaned the area and let it set for 2 hrs–when I checked it, plug was wet with oil. Will your product stop a threaded plug from leaking?

    • BlueDevil Pro on July 6, 2020 at 9:21 am

      John-

      Thank you for asking about your Chevy Avalanche. Unfortunately, we don’t manufacture a product for the type of leak you have described. Our product would be intended for rubber seals/gaskets. Having the drain plug replaced may be your best option.

      Thank you!

      -BDP

  30. Deanne Petroschuk on July 14, 2020 at 12:38 am

    I have a ford 8.8 rear end has a small leak in one of the axles and the bottom of diff seal how much blue devil should I add?

    • BlueDevil Pro on July 14, 2020 at 8:39 am

      Deanne-

      You would want to 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

  31. Rocky on August 17, 2020 at 1:17 am

    Will this stop the seals from leaking on the front axle of my 1997 Dodge Ram 1500 4 x 4…??? The seals are at the pumpkin and not at the wheels.

    • BlueDevil Pro on August 17, 2020 at 9:05 am

      Rocky-

      Yes, the BlueDevil Oil Stop Leak would be able to seal the leak you’ve described on your Dodge Ram 1500. You will use one oz. of the product per quart of fluid in the system and should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  32. Alan Yonk on September 28, 2020 at 2:19 pm

    When I had my oil change the mechanic indicated that the front differential half seal case seal is leaking on my 2007 Toyota 4Runner and I should take it to a transmission shop to have the differential removed and the seal replaced. I have never seen any fluid spots on the drive or garage floor beneath the front of the vehicle. When I talked to the transmission shop they said it would take 3-4 days to repair. Do you think the Blue Devil Oil Stop Leak would stop this leak?

    • BlueDevil Pro on September 29, 2020 at 7:43 am

      Alan-

      Thank you for asking about your Toyota 4Runner. Based on your description, you would be a good candidate for the BlueDevil Oil Stop Leak. You would use one oz. of the product per quart of fluid, and you should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  33. Bill on September 28, 2020 at 3:00 pm

    Will it seal a porous differential cover? Rust has set in, and the diff is seeping.

    • BlueDevil Pro on September 29, 2020 at 7:41 am

      Bill-

      BlueDevil Oil Stop Leak would only have an affect on rubber seals/gaskets. Unfortunately, replacing the differential cover may be your best option.

      Thank you!

      -BDP

  34. James on November 16, 2020 at 10:38 pm

    I imported a Toyota d4d 4wd,and suspects the way it was packed during shipping caused the continuous leak of diff oil on the left wheel as they removed the wheels and used both to support the diff it self on the big truck that carried it from abroad can this help?or should I change the whole diff?

    • BlueDevil Pro on November 17, 2020 at 12:42 pm

      James-

      Thank you for asking about your Toyota. Based on your description, it would be worth trying the BlueDevil Oil Stop Leak for your differential leak. You will use one oz. of the product per quart of oil in the system. You should expect to start seeing improvement after 100-200 miles of driving.

      Thank you!

      -BDP

  35. Jeremiah on November 22, 2020 at 1:52 am

    I have a 2014 Mercedes ml350 and I just started getting a rear diff leak out of the passenger side output for the axle does this work with Mercedes specified 75w85 hypoid gear oil? and if so how long should I keep it in the diff before servicing it again?

    • BlueDevil Pro on November 23, 2020 at 11:58 am

      Jeremiah-

      Yes, the BlueDevil Oil Stop Leak is safe and compatible to use on your Mercedes with Mercedes specified 75w85 hypoid gear oil. You will use one oz. of the product per quart of oil in the system. The product can stay in the oil for the life of the oil. It does not have to be changed out immediately after results are achieved.

      Thank you!

      -BDP

  36. Derek Turner on December 10, 2020 at 5:25 pm

    Will this product work on a leaking transfer case for a 2010 Toyota Sienna?

    • BlueDevil Pro on December 11, 2020 at 8:24 am

      Derek-

      Yes, the BlueDevil Oil Stop Leak would be able to treat the leaking transfer case on your Toyota Sienna. As long as you are not losing oil too quickly, 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

  37. David on December 27, 2020 at 12:32 pm

    WILL THIS WORK ON A 2004 GMC REAR DIFFERENTIAL BACK SEAL.

    • BlueDevil Pro on December 28, 2020 at 10:18 am

      David-

      Yes, the BlueDevil Oil Stop Leak is safe and compatible to use on your GMC with a rear differential leak. You will use one oz. of the product per quart of oil in the differential. Expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  38. Rodney Wayne Diehl on January 13, 2021 at 8:30 pm

    1951 Ford F-1, Chevy drive train replaced original in mid 70s. Axel housing from differential to driver’s side wheel is wet from unseen leaking. I just refilled differential with gear lube because of excessive noise. How should I utilize your product

    • BlueDevil Pro on January 15, 2021 at 10:56 am

      Rodney-

      Thank you for asking about your Ford F-1! The BlueDevil Oil Stop Leak is the recommended product to treat your differential leak. One bottle would treat 4-6 quarts of oil. It sounds like you would be a good candidate for the product, however, you may want to verify the type of material that the seals use in that engine. Some older vehicles use rope or cork seals rather than rubber. BlueDevil Oil Stop Leak is specifically designed to react with rubber seals/gaskets.

      Thank you!

      -BDP

  39. Aj on February 3, 2021 at 7:49 pm

    Would this stuff work for Volvo Vnl 630 semi truck Differential.it’s leaking from the bottom of the differential.I got repaired tree time won’t last more than a week.trying to see if this stuff would work.

    • BlueDevil Pro on February 4, 2021 at 8:35 am

      Aj-

      Yes, the BlueDevil Oil Stop Leak would be able to treat a leaking differential seal. The product is intended for leaks that are seeping or lightly dripping. You would use one oz. of the product per quart of differential fluid. Expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  40. Robin Singh on February 20, 2021 at 4:56 pm

    Will this work on a 2006 Audi A4 Quattro front differential, and also stop engine leak due to valve cover gaskets

    • BlueDevil Pro on February 22, 2021 at 8:16 am

      Robin-

      Thank you for asking about your Audi A4. Yes, the BlueDevil Oil Stop Leak would be able to seal your front differential and valve cover gasket leaks. For the differential leak, you will add one oz. of the product per quart of differential fluid in the system. With both, expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

      • Robin on March 2, 2021 at 6:21 pm

        After a few days of having the blue devil in my engine oil, I’m sure I’m still having leaks since my exhaust fumes are coming out blue which means it’s still mixing in my fuel system. Is there any notes or steps that I’m missing?

        • BlueDevil Pro on March 3, 2021 at 8:59 am

          Robin-

          Blue smoke coming out of the exhaust pipe would indicate oil is burning, not that it’s mixing in with the gasoline. This could be related to worn piston rings, valve cover gaskets, or worse, that the head gasket is leaking oil. Did you add the product into the differential and engine oil as well? 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

  41. Robin on March 3, 2021 at 1:51 pm

    It is the valve cover gasket I can see it leaking into the spark plug sockets. And no I just tried it on the engine first to see if it would fix it as that’s the main leak. But I’ll definitely give them a call

  42. Jess on March 12, 2021 at 5:14 pm

    Would this work on a rear differential seal leak

    • BlueDevil Pro on March 15, 2021 at 8:30 am

      Jess-

      Yes, the BlueDevil Oil Stop Leak would be able to treat a leaking rear differential seal. You would use one oz. of the product per quart of fluid.

      Thank you!

      -BDP

  43. Patrick on August 26, 2021 at 8:15 am

    Just replaced a pinion seal on a truck..but still leaking. Can I use blue devil?

    • BlueDevil Pro on August 26, 2021 at 9:55 am

      Patrick-

      Yes, the BlueDevil Oil Stop Leak would be the best product to use for the leak you’ve described. You will use about one oz. of the product per quart of fluid in the differential. Expect to start seeing improvement after 100-200 miles of driving.

      Thank you!

      -BDP

  44. Ray on October 7, 2021 at 11:07 pm

    Hi, I have 2013 Dodge Durango have small leak in the front differential dose your product seal the leak? Can I do it my self without taking it to the mechanic shop? And how I can use it ? Thanks an advance.

    • BlueDevil Pro on October 8, 2021 at 8:11 am

      Ray-

      Yes, the BlueDevil Oil Stop Leak would be able to seal the leaking differential seal on your Dodge Durango. You will use one oz. of the product per quart of fluid in the differential. You would add the product directly into the differential fluid. Expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  45. Robert Hooker on October 9, 2021 at 2:51 pm

    How much stop leak do I use in a ford f150 rear differential.

    • BlueDevil Pro on October 11, 2021 at 8:11 am

      Robert-

      Thank you for asking about your Ford F-150. You will use one oz. of the BlueDevil Oil Stop Leak per quart of fluid capacity, for your rear differential leak. You should expect to start seeing improvement after 100-200 miles of driving.

      Thank you!

      -BDP

  46. Kenneth Jones on November 27, 2021 at 10:13 am

    Is your product compatible with the limited slip fluid required for a 2007 Ford Mustang GT?

    • BlueDevil Pro on November 29, 2021 at 8:32 am

      Kenneth-

      Yes, the BlueDevil Oil Stop Leak is safe and compatible to use in your Ford Mustang GT. You will use one oz. of the product per quart of differential fluid. Expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  47. Anthony on January 21, 2022 at 2:46 pm

    would it stop a final drive leaking on a hitachi ex 40 excavator

    • BlueDevil Pro on January 24, 2022 at 8:29 am

      Anthony-

      The BlueDevil Oil Stop Leak is only intended to treat rubber seals/gaskets. If the leak is coming from a rubber component, and the leak is not more than a seep or light drip, you would be a good candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  48. Robert on March 10, 2022 at 4:26 am

    Just replaced my cv axle on 08 ford expedition, I apparently screwed up axle seal because after a few days and some highway driving I noticed that slight burning smell I climb under to take a look and see diff oil everywhere. After one hour of being parked there was a 6 inch puddle under the truck. Was going to get down and do the entire axle job all over again to replace seal but then I heard about blue devil. Will this actually work for my axle seals?

    • BlueDevil Pro on March 10, 2022 at 8:52 am

      Robert-

      Thank you for asking about your Ford Expedition. The BlueDevil Oil Stop Leak works by revitalizing and reconditioning rubber seals/gaskets. It would not “fill in” a hole or “plug in” a gap. Based on your description, the only remedy would be to replace the seal.

      Thank you!

      -BDP

  49. Rick Rice on April 9, 2022 at 7:41 pm

    I have a John Deere 8200 tractor, will this product work in the front differential of MFD ? I’m leaking around seal where the drive shaft goes in to front end .

    • BlueDevil Pro on April 11, 2022 at 8:31 am

      Rick-

      Thank you for asking about your John Deere. Yes, the BlueDevil Oil Stop Leak would be able to treat the differential leak you’ve described. You will use one oz. of the product per quart of fluid in the differential. Expect to start seeing results after 1-2 hours of operation.

      Thank you!

      -BDP

  50. Wayne on April 28, 2022 at 10:30 pm

    Is your product safe to use on an Eaton TruTrac differential with a rear hub leak?

    • BlueDevil Pro on April 29, 2022 at 9:23 am

      Wayne-

      BlueDevil Oil Stop Leak is not intended to be used with brake fluid or in brake systems.

      Thank you!

      -BDP

  51. Mike on August 15, 2022 at 8:36 am

    I have a 2007 Saturn vue AWD V6 with this work for my rear differential leak. Thanks

    • BlueDevil Pro on August 15, 2022 at 10:08 am

      Mike-

      Yes, the BlueDevil Oil Stop Leak is safe and compatible to use for the rear differential leak on your Saturn Vue. You will use one oz. of the product per quart of fluid in the differential. Expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  52. T.J. Graves on December 8, 2022 at 5:42 pm

    I first used a blue devil product about 20 years ago on a head gasket. Over the years I was very happy to see blue devil develop a full product line, because truth be told, ITS THE ONLY ONE THAT WORKS! And for the last 20 years, it’s the only one I’ll use. Great product. (Just make sure you follow the instructions!!!)

  53. Michael on January 1, 2023 at 11:35 am

    I have RTV on my rear differential… will this work the same even though it’s not an actual gasket?

    • BlueDevil Pro on January 3, 2023 at 11:20 am

      Michael-

      Unfortunately, BlueDevil is not designed to work on RTV type seals. It is designed to work on all rubber seals/gaskets.

      Thank you!

      -BDP

  54. Ford on February 28, 2023 at 9:02 pm

    I have a 2008 Polaris sportsman 800 and have a leaky front diff. Would I be able to use this product in that ?

    • BlueDevil Pro on March 1, 2023 at 8:26 am

      Ford-

      Yes, the BlueDevil Oil Stop Leak is safe and compatible to use in your Polaris Sportsman for the front differential leak. You would use one oz. of the product per quart of oil. You should expect to start seeing results after 1-2 hours of operation.

      Thank you!

      -BDP

  55. Lynn on August 18, 2023 at 7:24 pm

    Will this stop the leak at my rear axel shaft seal

    • BlueDevil Pro on August 21, 2023 at 8:28 am

      Lynn-

      Yes, the BlueDevil Oil Stop Leak would be able to treat a seep or light drip coming from the rear axle shaft seal. You should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  56. Wes on September 14, 2023 at 2:53 pm

    Hello, will this seal a rear differential in a 2008 Kia Sorento? I’m having a time finding the leak..looks like it’s leaking around the 11 o’clock area of differential..
    Also..will it seal a small pin hole in differential from rust? (If that happens to be where it’s leaking..I’m not sure yet) thank you

    • BlueDevil Pro on September 15, 2023 at 8:18 am

      Wes-

      Yes, the BlueDevil Oil Stop Leak would be able to treat the rear differential leak on your Kia Sorento. The product is specifically intended for rubber seals. It would not have any effect on a metal component. You would use one oz. of the product per quart of oil/fluid. Expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

  57. Jgthomas on January 4, 2024 at 7:06 pm

    Will this stop a slow leak 8n rest differential of a manual 5 speed Nissan frontier and of so would j add it to the differential itself or put it in the same place the engine oil goes?

    • BlueDevil Pro on January 5, 2024 at 9:01 am

      Jgthomas-

      The BlueDevil Oil Stop Leak would be able to treat a leaking differential seal as long as it not more than a seep or a light drip. You would use one oz. of the product per quart of fluid in the differential. Yould add the product directly into the differential fluid and should expect to start seeing results after 100-200 miles of driving.

      Thank you!

      -BDP

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