Transmission Stop Leak Concentrate (1420)

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Transmission Stop Leak Concentrate (1420)

Stops and seals transmission fluid leaks. This product is specially designed to stop seal and gasket leaks caused by normal transmission wear and age. It even works with ALL domestics and imports, as well as all automatic and manual transmission fluids. Proven by years on the market and over 100K units sold nationally. Bar's Leaks is the leader in automotive aftermarket repair solutions, with products being used in consumer, commercial, OEM and military applications for over 70 years. Contact Us About This Product Find This Product Near You

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  • Will Bar’s Leaks Transmission Stop Leak clog my filter?

    No. Unlike our cooling system product, Bar’s Leaks Transmission Stop Leak has no particles to plug the leak, it works chemically to stop leaks in gaskets and seals.

  • Will Bar’s Leaks work with all types of transmission fluid?

    Yes, Bar’s Leaks is one of the only transmission stop leaks that is compatible with all petroleum-based transmission fluids including synthetics. Use in regular automatic or manual transmissions. Also safe to use in CVT transmissions.

  • How does Bar’s Leaks Transmission Stop Leak work?

    After time, transmission seals tend to dry out and shrink. Bar’s Leaks revitalizes these seals and makes them soft and pliable again.

  • How much do I install?

    Our 1420 (11 oz.) is designed for one bottle to be installed in a passenger car or light truck. For larger systems use one 1 bottle for every 10 quarts of fluid.

  • If first application does not completely stop leak, may I add another bottle?

    Yes, you can install a second application for hard to stop leaks. If your leak still persists after a second application, then mechanical attention may be required.

  • If I install more than the required amount, will it work faster or better?

    No, we have formulated our product to work best at the suggested dosage amount.

  • How long does it take to start working?

    Bar’s Leaks Transmission Stop Leak starts working the minute you install and start driving the vehicle. You will usually see results in about 200 miles or three (3) days of driving.

  • Can Bar’s Leaks Transmission Stop Leak be used in a standard (manual) transmission?

    Yes, you can use this product to help stop leaks in a manual transmission. Use approximately 2 ounces per quart of capacity.

This product is specially designed to stop seal and gasket leaks caused by normal transmission wear and age. It even works with ALL domestics and imports, as well as all automatic and manual transmission fluids. We’ve got you covered. All Bar’s Leaks products — our transmission stop leak and more — are easy to use. That’s because we want everyday driver to be able to use our solutions to stop leaking transmission fluid — even if they don’t know much about what’s going on under the hood.

All you have to do now is follow our easy installation process. While many worry about applying products under the hoods of their cars, our transmission stop leak solution couldn’t be easier to use. In under an hour, your overworked transmission will get the help it deserves so you can get back on the road and back to your life. You won’t find a more effective or affordable solution for transmission fluid leaks than Bar’s Leaks.

Get Your Vehicle Back on the Road

When you need effective chemical repair solutions that help avoid a pricy trip to the mechanic, Bar’s Leaks is here to help. We’ve been developing and offering problem solving products for transmission fluid, engine oil, power steering, head gaskets, cooling systems and much more for nearly 70 years. Located just an hour outside of Detroit, our headquarters employs top-flight chemical engineers who are all pushing toward a common goal — delivering the most affordable, effective products to stop leaking transmission fluid and other automotive issues.

We’ve served tens of millions of customers through our decades of service. Why do they keep coming back? You can find plenty of products on the market that claim to stop transmission fluid leaks. But many of these products are ineffective, and some even make your issue worse. At Bar’s Leaks, we offer real solutions when you need a transmission stop leak. Our team is always innovating to improve our existing products and develop new products as auto manufacturers introduce new developments (such as DSG/twin clutch transmissions). There’s a reason why we’re the best-known transmission stop leak brand in the industry. Trust Bar’s Leaks and discover just how effective our products are at stopping your transmission fluid leak.

Get your leaking transmission fluid solution today.

Leave a Review

  • “I want to thank you for making products that work. My transmission had a front pump seal that leaked out 4 quarts of fluid in about 300 feet. So I went to the auto store to get some fluid and see if I could find some stop leak. I won’t put just anything in my car either. While looking around I found one that said Bar's I thought if anything will work this will. So I put it in and about 3.5 quarts of fluid and drove the car 30 some miles back home. I will replace the seal. But I did not need a wrecker. Thank you.”

    B. M. - Cartersville
  • “This additive really works! While I was changing my transmission fluid I discovered a leak coming from the side of the transmission where the shift leveler connects to the tranny. It would leak a few drops of atf every morning, the mechanic quoted me $600 just to change the stupid little seal. I decided to try this product but I only poured less than half since the leak wasn't too bad and after 3 days of driving the leak complety stopped, thanks for saving me $$$ great product!!”

    Anyonio - Salinas, CA
  • “About one year ago, I purchased a bottle of Bar's Leaks power steering stop leak concentrate and it solved my power steering leak problem.

    About two months ago, I was experienced a loss of prime on my automatic transmission when I stopped at traffic lights (Buick Terraza). I decided it was either internal leaks or scored pump. I put in a bottle of your Bar's Leaks transmission stop leak concentrate and my problems have disappeared. Apparently some internal seals were softened up enough to again do their job.. Your technology is good for more than power steering! You probably already know this but I just wanted to thank you!”

    F. Walker - Grand Blanc, MI