How can I Stop My Transmission From Leaking Fluid?

Stop transmissino leakHave you ever looked under your car and found that it was leaking some sort of fluid that you didn’t even know your car had in it?  Most of us know engine oil is brown or black, coolant is usually green, but you usually don’t see a red fluid.  Automatic transmission fluid is still oil, but usually thinner than engine or gear oil and tinted red in color.  If you’ve found this under your car, then you most likely have a transmission leak.

To check for a leak in your automatic transmission, you can do a visual inspection to try and find the leak point.  Here are some of the most likely places to check:

Automatic Transmission Leak Points:

  • Drive shaft seal
  • Transmission pan seal
  • Input shaft seal
  • Valve body seal

Transmission leak fixChecking your transmission fluid level can also be confusing.  Unlike your engine oil your transmission fluid level needs to be checked while your vehicle is parked and running.  he dip stick will often have a red cap on it and be towards the rear of the engine near the firewall.  There will be 2 different level indications on the dip stick, one for when the fluid is cool, and one for when the fluid is warm.  Your automatic transmission fluid level should indicate in the “cold” range when you first start your vehicle and haven’t yet driven.  It should indicate inside the “hot” range after you’ve driven your vehicle relatively hard, for example, up a long hill, towing, or with the transmission in a lower gear to increase engine RPM.

Once you’ve identified your leak either by a low fluid level or visual inspection, the next question is: How much will this cost to fix?  If you let your transmission operate with a low fluid level, it will cause it to start shifting hard, but eventually will cause permanent damage and could cost thousands to replace.

350x200_TSLThe best way to prevent these high repair costs, and avoid having to add transmission fluid every few days to your vehicle is to use BlueDevil Transmission Sealer.  BlueDevil Transmission sealer is added directly to your automatic transmission with no need to do a fluid change.  Just add BlueDevil Transmission Sealer and it will work as you drive to seal your leak.  As you drive, Transmission Sealer will be absorbed into the worn out seals and gaskets in your transmission restoring them to their original size and sealing properties. You can purchase BlueDevil Transmission Sealer from the manufacturer here: Transmission Sealer, or find it at your local parts stores like:

  • Bennett Auto Supply
  • Prime Automotive
  • O’Reilly Auto Parts
  • Pepboys
  • Car Quest Auto Parts
  • Advance Auto Parts
  • NAPA
  • Autozone

Pictures provided by autorepair.about.com and www.peachparts.com

75 Responses to “How can I Stop My Transmission From Leaking Fluid?”

  1. Rick on

    I have a 2002 Acura RL (front wheel drive). Differential has a small leak. Not leaking from the front cover so it has to be a seal leak. Having to top-off monthly. Do you have a product that could stop the leak?

    Reply
  2. Ben on

    I have 1997 dodge ram 1500 2 wheel drive 5.9 letters. I started having issues with the transmission. I have noticed that every now and then the reverse gear will not kick in. If I drive it forward a bit, then reverse it, it will work. I went underneath the truck and noticed that the transmission pan is a wet. It has been leaking fluid. What do you recommend I do?

    Reply
    • BlueDevil Pro on

      BlueDevil Transmission Sealer would be appropriate to stop your leak. The reason the transmission may be hesitating is because of the fluid being to low.

      When you add the product, be sure to use one ounce of BlueDevil per one quart of fluid capacity.

      Reply
  3. Jamaal C. on

    Hi, I have a 2001 infiniti i30 . n my input shaft seal is leaking. What would be the quickest and easiest way to fix my problem?

    Reply
    • BlueDevil Pro on

      You would want to use the BlueDevil Oil Stop Leak to stop the leak from your input shaft seal. You will need to add about 1 ounce of BlueDevil per 1 quart of oil capacity.

      Feel free to contact us at 888.863.0426 with any further questions.

      Reply
  4. D on

    I have a 1984 bmw 318i and my transmission leaks as soon as I pour it in…. I was wondering if the sealant really works or do I need a whole new tranny…

    Reply
    • BlueDevil Pro on

      Based on your description it sounds like you may have a leak that is too large for this to work properly. If you have further questions, please call our tech line at 1.888.863.0426.

      Thanks,
      -BDP

      Reply
  5. Dawid on

    I have a 2010 Geely CK. 1.5. The transmission is leaking oil and i don’t know where its coming from. Could you give me some advice please?

    Reply
  6. Eric on

    I have a 2007 Chevy Tahoe LTZ. I just came back from a 2 week vacation and when I opened the garage door I noticed a significant amount of transmission fluid on the garage floor. My neighborhood mechanic says it’s a leak at the front yoke and ujoint. Will this product work to stop the leak?

    Reply
    • BlueDevil Pro on

      Based on your description it should work great for you! Use 1oz. of BlueDevil Transmission per quart of capacity. If you have further questions, please call 1.888.863.0426

      -BDP

      Reply
  7. Gerald on

    I have a 1986 Ranger with automatic tranny that I believe has a seal leaking inside the tranny. RPMs increase between shifts from 2nd to 3rd like it may be having trouble holding enough pressure to shift. Once it shifts it pulls fine.

    Reply
    • BlueDevil Pro on

      Gerald,

      You would be safe in using the recommended amount of BlueDevil Transmission Sealer. Keep in mind that it may take 100 miles or so before you see full results. If you have further questions, give our tech line a call at 1.888.863.0426.

      Reply
  8. jesse on

    I have a 91 ford f150 2wd with a 5 speed manual transmission I have a front inspection plate seal that is leaking a slow drip after driving then eventually it will stop will blue devil work for that the truck has 150000

    Reply
  9. john will on

    Hi, I definitely have a transmission leak, every day a quarter size red dot is on the driveway. I have a 2001 mazda tribute es, all wheel drive. Leak is on drivers side ,near the front of vehicle. Just ordered a bottle of your sealer, from blue devil. expect it in a few days. Anyway, I just top off my transmission fluid, to be safe. Can I still use the sealer or do I wait till the fluid is low? Thank you John 7-29-2014

    Reply
    • BlueDevil Pro on

      Yes… but be sure you don’t overfill. Use 1oz. of Transmissions Sealer per 1qt. of Transmission Fluid.

      If you have any other questions don’t hesitate to call 1.888.863.0426!

      -BDP

      Reply
  10. Richard Harrison on

    I have a 2006 buick lacrosse cxs will this produck work to stop my leak dont know where it coming from yet but i dont think its a big leak

    Reply
  11. Tia Martin on

    I have a Volvo v70 2000 with a transmission leak how many bottles of blue devil sealant would I need to seal my leak? And do I need to add transmission fluid with it?

    Reply
  12. Neil on

    Hi I’ve got a mercedes v220 auto, I’ve been told it’s the torque converter seal / gasket. Will your stuff be good for this? Cheers

    Reply
    • BlueDevil Pro on

      Neil-

      Yes, you will need to use the BlueDevil Transmission Sealer. You should add 1 ounce of BlueDevil per 1 quart of fluid capacity. Please give us a call if you have any issues or questions. 1.888.863.0426

      -BDP

      Reply
  13. Tyrone McGarrell on

    I have a 2001 Maxima and see drops of transmission fluid overnight. I haven’t been able to identify where the leak is. Should I use the stop leak anyway.

    Reply
  14. Cierra on

    Had a mechanic look at my car they said my transmission oil pressure switch is the reason for my leak. Could I still use the transmission sealer? Because I don’t have the money right now to fix it.

    Reply
  15. Tonya on

    I have a 00′ Ford Taurus, when I let my car run I have fluids in the body on the driver side up front and the middle. Is this a transmission leak?

    Reply
  16. Michelle Bailey on

    leak coming from the front. Says it could be anything from seals to the differential or more. I can’t afford $650-700 to repair it. Would this sealant really work? And do I wait until the fluid is low before adding it?

    Reply
    • BlueDevil Pro on

      Yes, the BlueDevil Transmission Sealer has a very high success rate and will work for the type of leak you have described. You should add 1 ounce of BlueDevil to every 1 quart of transmission fluid (for instance if your vehicle holds 5 quarts of trans fluid then you should add 5 ounces of BlueDevil.

      -BDP

      Reply
  17. Skunkwolves on

    I have a 85 D150 dodge truck. I have replace the transmission pan gasket and I still have a small leak on the gasket. Will blue devil fix the small drip?

    Reply
    • BlueDevil Pro on

      Yes, the BlueDevil Transmission Sealer is specifically intended to stop leaks from any seals/gaskets within the Transmission including the pan gasket. You should add 1 ounce of BlueDevil to every 1 quart of transmission capacity.

      -BDP

      Reply
  18. Charlie Brown on

    My transmission fluid runtime out when it is put in the truck is a 1988 ford 150 it runs and is great on the highway will blue devil stop the out pour of transmission fluid

    Reply
    • BlueDevil Pro on

      Charlie-

      If it is coming out as quickly as you pour it in then it may be too extreme for BlueDevil to work. If it isn’t a sever leak then the BlueDevil Transmission Sealer would be a great solution to stopping the leak.

      -BDP

      Reply
  19. Willie on

    I have a 2003 VW Passat and the transmission is leaking about a 3 inch diameter puddle after sitting over night from a 50 mile drive. I am told the TIPTRONIC TRANSMISSION is rather finicky and adding anything other than the recommended transmission fluid may not be recommended. Would you recommend BlueDevi Transmission Sealer with the information provided?

    Reply
  20. murf on

    Have a small leak. I am told.it is the rear main seal. Leaves about a dime size spot after driving. Which of your products would you recommend.

    Reply
  21. Al on

    I have a 06 vw new beetle and it is leaking a good amount of transmission fluid when parked after driving. Can’t see where it’s coming from because of the metal plate covering the bottom. Any suggestions??

    Reply
    • BlueDevil Pro on

      Ricky-

      You first may want to confirm that you are only losing transmission fluid. The BlueDevil Transmission Sealer will work to seal a transmission leak but if it is literally “pouring out” that may be a situation where the leak is too large for this to work properly.

      Please contact our tech support team at 888-863-0426 so that we may assist you.

      -BDP

      Reply
    • BlueDevil Pro on

      Moh-

      If the transmission fluid is actually leaking from the hose or hose connection then the BlueDevil will not work. The BlueDevil Transmission Sealer is specifically formulated to stop leakage from the rubber seals/gaskets.

      -BDP

      Reply
  22. Charla on

    The dealer replaced the transmission on my 2nd vehicle, a 2006 Lincoln Mark LT a few months ago. Now it is sluggish when accelerating all over again and I have been told that it is leaking Diffrential fluid because it leaves transmission fluid on my driveway when I drive it. Is this a seperate issue or should it be covered under the warranty that came with the new transmission? Did they tighten or seal something improperly?

    Reply
    • BlueDevil Pro on

      Charla-

      I would first confront the dealer that did the transmission work to see if they can cover the repair under warranty. If not, we recommend adding the proper amount of BlueDevil Oil Stop Leak to help stop the leak from your differential. You will not need the whole bottle, add 1 ounce of BlueDevil per 1 quart of fluid; most likely you will only need to add 2 – 3 ounces of BlueDevil.

      We hope this helps!

      -BDP

      Reply
  23. Rosita on

    I was driving one day in my Nissan Altima & then i won’t not drive more for 15sec.I turned my car Off & then i started my car and it drove perfectly.I went to NAPA & they told me that I had no transmission fluid more ,they put transmission fluid for me.It have been 1week all & everyday in the morning i see a little leak of transmission leak (5 cm a 5 cm) .But during the day it doesn’t leak ,would this work?

    Reply
    • BlueDevil Pro on

      Rosita-

      We recommend adding about 8 ounces of the BlueDevil Transmission Sealer to your transmission fluid. The should eliminate the leak and prevent you from having to add transmission fluid in the future. Keep in mind, it may take about 100 miles of driving before you see full results; if you do not drive a whole lot it can take a couple of days.

      Thank You!

      -BDP

      Reply
  24. skyler on

    I have a 1997 ford Taurus. I took it in to get a tune up because I was having trouble with my transmission. The mechanic told me that a had a front seal leak. I had to put in some fluid when I went on a 300 mile road trip but other than that haven’t had to put fluid in for the 6 months ive owned it. Can this product help?

    Reply
    • BlueDevil Pro on

      Skyler-

      Yes, the BlueDevil Transmission Sealer is made specifically for stopping transmission fluid leaks. It sounds like you are catching the leak fairly early so you should have no problem stopping it with BlueDevil. You should be adding 1 ounce of BlueDevil per every 1 quart of transmission capacity.

      Thanks!

      -BDP

      Reply
  25. CARTER on

    I hav a 91 grand marquise with a transmission leak i cant ho forward or backwards will blue devil work or do i need a new one please help

    Reply
    • BlueDevil Pro on

      Carter-

      If the vehicle is unable to drive forward or backward then it is already to a point that is beyond what BlueDevil is intended to fix. We recommend taking the vehicle into a transmission specialist.

      Thank You!

      -BDP

      Reply
  26. Roger on

    I have a 2005 GM 3500 truck and the transmission fluid is leaking and I was wondering if the Blue Devil Stop Leak would help to stop the leak.
    If so, would one bottle be good enough to stop the leak. Also if I use the product would it affect the vehicle warranty?

    Thank you

    Reply
    • BlueDevil Pro on

      Roger-

      Yes, the BlueDevil Transmission Sealer would be appropriate and safe to use in your GM truck. You may want to check with the dealership on whether or not using this product will affect your warranty status. However, if the vehicle is under warranty you may be able to have the seal replaced at no cost.

      If you do end up using the BlueDevil Transmission Sealer you should add about 10 ounces to your transmission fluid.

      Thank You!

      -BDP

      Reply
  27. Jacob on

    i have a 1995 Cadillac seville STS, the front main seal has a leak. The leak is coming from the top of the transmission. The car has NOT been driven in 2 years because of this issue. But I changed the filter, pan, pan gasket and fluid the other day the car drove for 10 miles, and the leak was not as bad, the pan gasket went before the front main one, Would this product wor for a car with 487,548 Miles?

    Reply
  28. chrissy on

    I have a 98 ford touras it been having transmission problems and it just started leaking what will help it last a little bit longer

    Reply
  29. quinton davis on

    I have a 2002 Chevrolet Impala and its leaking transmission fluid making it slip how can I fix this without it costing me an arm and a leg?

    Reply
  30. gary on

    So the write-up describes your product being for automatics. Do you have another product for manual transmissions, or is this fine for manuals too? Mine is an old (’89) 5 speed, not exactly sure of leak(s) locations, but leak might be at rate of about 2 oz a week (?). sound potentially in the range of Blue Devil’s ability to remedy? thanks!

    Reply
    • BlueDevil Pro on

      Gary-

      The BlueDevil Transmission Sealer is compatible with automatic and manual transmissions. Keep in mind, you need to add 1 ounce of BlueDevil per every 1 quart of transmission fluid capacity; many times a manual transmission has a smaller capacity.

      Thank You!

      -BDP

      Reply
  31. Amber on

    I have a 1998 Chrysler Sebring convertible and my transmission leaks and we tried tightening the hose but still leaks and are car will stall for a second sometimes because of the leak do you think your product would work

    Reply
    • BlueDevil Pro on

      Amber-

      If the leak is only coming out around the hose then this will not work. If the leak is coming out around any of the seals or gaskets then then the BlueDevil Transmission Sealer is recommended.

      -BDP

      Reply

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