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Best 9 Transmission Leak Sealers Reviewed [And 1 to Avoid!]
B. B. Lykert
B. B. Lykert
June 18, 2023
PreviewBrandMy RatingPrice
BlueDevil 00236 Transmission Sealer - 16 OunceBlueDevil 00236 Transmission Sealer - 16 Ounce8.4/10Check Price Now
Bar's Leaks High Mileage Transmission Repair, 16.9 Fl Oz Pack of 1Bar’s Leaks High Mileage Transmission Repair, 16.9 Fl Oz Pack of 18.6/10Check Price Now
Bar's Leaks 1420 Transmission Stop Leak - 11 oz. , GreyBar’s Leaks 1420 Transmission Stop Leak - 11 oz. , Grey8.2/10Check Price Now
RisloneRislone8.6/10Check Price Now
Lucas LUC10009 Transmission Fix 24 oz., Brown (Packaging May Vary) , WhiteLucas LUC10009 Transmission Fix 24 oz., Brown (Packaging May Vary) , White9.2/10Check Price Now
Bar's Leaks 1416 Super Transmission Fix - 16.9 oz. 1 PackBar’s Leaks 1416 Super Transmission Fix - 16.9 oz. 1 Pack8.2/10Check Price Now
NiteoNiteo7.6/10Check Price Now
No Leak, All in One Stop LeakNo Leak, All in One Stop Leak7.6/10Check Price Now
CRCCRC8.8/10Check Price Now
Liqui Moly 1042 Gearbox Oil Leak Stop - 50 LiterLiqui Moly 1042 Gearbox Oil Leak Stop - 50 Liter1/10Check Price Now

BlueDevil 00236 Transmission Sealer - 16 Ounce

BlueDevil 00236 Transmission Sealer - 16 Ounce

After using it, I can confidently say that it’s a great product.

The instructions were clear and easy to understand, so I didn’t have any trouble using the product. The instructions said to add the transmission leak sealer to a quart of oil and pour it into the transmission case. After doing this, I drove my car around for a few hours and immediately noticed an improvement. There was significantly less leaking after just one use!

The product also helped reduce some of the noise that came from my transmission system, which is great because I don’t have to listen to loud engine noises while driving anymore.

Overall, ‎BlueDevil Products transmission leak sealer did exactly what it advertised: stop leaks and reduce noise in my transmission system. The price was reasonable and the results were definitely worth it. Highly recommended!

Be sure to also check out these additive for transmissions that I also compared! Plus, here is the price history on Amazon:

Price history for BlueDevil 00236 Transmission Sealer - 16 Ounce on Amazon

Check Price on Amazon

Bar’s Leaks High Mileage Transmission Repair, 16.9 Fl Oz Pack of 1

Bar's Leaks High Mileage Transmission Repair, 16.9 Fl Oz Pack of 1

I used it on my 2004 Honda CRV, which had been leaking transmission fluid from a worn-out seal. The product was incredibly easy to use—just pour it into the transmission’s oil filler tube and then let the car idle for about 15 minutes.

After letting the car idle and then running it for a few more minutes, I checked under the car and found that most of the leakage had stopped. Impressive! Since then, there has been no more leakage at all.

The only suggestion I have with this product is to change your engine oil after using it to flush out any residue left behind. This did add a bit of extra cost and effort, but worth it in the end.

Overall, I’m really impressed with ‎Bar’s Leaks transmission leak sealer. Very affordable price tag, does what its supposed to do, and uses minimal effort -all factors which make this a great product!

Be sure to also check out these tranny tubes that I also compared! Plus, here is the price history on Amazon:

Price history for Bar's Leaks High Mileage Transmission Repair, 16.9 Fl Oz Pack of 1 on Amazon


Bar’s Leaks 1420 Transmission Stop Leak - 11 oz. , Grey

Bar's Leaks 1420 Transmission Stop Leak - 11 oz. , Grey

The sealer was easy to use and the instructions were straightforward. After draining the oil from my car, I added the sealer directly into the transmission system. I found it had a pleasant smell and didn’t make a mess. After about two hours of driving, I felt my car running smoothly without any strange noises or leakages.

The main downside of this product is its duration - although it worked well initially, after six months I noticed a slight leakage again that needed to be treated with an additional sealant. Despite that inconvenience, ‎Bar’s Leaks transmission leak sealer remains one of the best leak sealers on the market at an affordable price - highly recommended!

Be sure to also check out these johnson trailer parts that I also compared! Plus, here is the price history on Amazon:

Price history for Bar's Leaks 1420 Transmission Stop Leak - 11 oz. , Grey on Amazon


Rislone

Rislone

For starters, ‎Rislone is easy to use. You just pour it into the transmission fluid and let it do its work. Within two or three days, I noticed a decrease in the amount of leaking coming from my car. The product worked almost immediately and I was very pleased with the results.

In terms of price, ‎Rislone is competitively priced in comparison to other products on the market. I believe it offers an excellent value for what it does, especially since it can be used both as a preventative measure as well as after a problem has already occurred.

The only downside to ‎Rislone is that it doesn’t fix deep root problems with transmission systems. It’s really just meant to be used temporarily until you can get your car into a repair shop for more detailed work. Still, for minor leaks this stuff works like a charm and so far, has been reliable for me over time.

Be sure to also check out these foam pads that I also compared! Plus, here is the price history on Amazon:

Price history for Rislone  on Amazon


Lucas LUC10009 Transmission Fix 24 oz., Brown (Packaging May Vary) , White

Lucas LUC10009 Transmission Fix 24 oz., Brown (Packaging May Vary) , White

I’m a car enthusiast, and I use this product on my own vehicles frequently.

I love the ease of use and convenience of the product. The instructions are simple to follow, and it only takes a few minutes to apply the sealer. I was very pleased with the results as well. After application, I noticed no more transmission fluid leaks and a smoother running engine.

The durability is also excellent; after several weeks, there have been no signs of wear or further leakage. It also didn’t leave any discoloration or residue on the inside of my engine bay, so there’s no need for extra maintenance in that area either.

Overall, I highly recommend LUCAS transmission leak sealer for anyone looking for an economical and reliable solution. It did an amazing job at sealing up my transmission without breaking the bank!

Be sure to also check out these grease guns that I also compared! Plus, here is the price history on Amazon:

Price history for Lucas LUC10009 Transmission Fix 24 oz., Brown (Packaging May Vary) , White on Amazon


Bar’s Leaks 1416 Super Transmission Fix - 16.9 oz. 1 Pack

Bar's Leaks 1416 Super Transmission Fix - 16.9 oz. 1 Pack

I was having a problem with a transmission leak, and this product offered an easy solution. The instructions were clear and easy to follow, and the product worked fast - after only 30 minutes my transmission no longer leaked.

The product did form a temporary seal in my car, but it didn’t last very long - after about three weeks the leak returned. I also found that I had to readjust the sealer every couple of days for maximum efficiency. Regardless, ‎Bar’s Leaks is still one of the better transmission leaks sealers I have found, so overall it works well for me.

Lastly, ‎Bar’s Leaks is cost effective and affordable; there are many other similar products on the market which are more expensive but don’t seem to work nearly as effectively. So if you want an affordable solution to your transmission leak problems, then ‎Bar’s Leaks should be your go-to choice.

Be sure to also check out these eelhoe foam cleaners that I also compared! Plus, here is the price history on Amazon:

Price history for Bar's Leaks 1416 Super Transmission Fix - 16.9 oz. 1 Pack on Amazon


Niteo Transmission Leak Sealer

Niteo Transmission Leak Sealer

I used it to stop an oil leak coming from my car’s transmission, and the results have been amazing.

The instructions on the bottle were very clear and easy to follow. It doesn’t take too long to apply the sealer either; I was able to quickly and easily pour it in my car’s transmission and all of the necessary connections. After driving around a few miles with this product, I noticed that all of the leaking had completely stopped.

The sealer also has a nice, pleasant scent when you first pour it in, which makes applying it easier. Overall, I’m definitely happy with Niteo’s transmission leak sealer because it worked as advertised, was reasonably priced, and was easy to use. I would highly recommend this product to anyone facing a similar situation.

Be sure to also check out these grease gun fittings that I also compared! Plus, here is the price history on Amazon:

Price history for Niteo Transmission Leak Sealer on Amazon


No Leak, All in One Stop Leak

No Leak, All in One Stop Leak

The product came nicely packaged in a squeezable foil pack with a nozzle that fits directly into the transmission area. I was pleasantly surprised at how easily it messaged into my vehicle’s transmission. After spending several hours attempting to locate the leak, I followed the instructions and used the entire bottle of NO LEAK.

After about 20 minutes of driving around, I noticed a significant decrease in leaking and no more fumes from under my car. There was also noticeably more power from my engine and smoother gear changes. My transmission seems to be functioning much better now!

However, it only worked for about 3 weeks before I had to replace a line in my transmission to keep it from leaking again. So while I’m still satisfied with NO LEAK, it didn’t completely solve my problem for good which was disappointing.

Overall, if you’re looking for a temporary solution to your leaking transmission problem without breaking the bank, NO LEAK is an ideal choice. However don’t expect long-term results or drastic improvements in performance - take it as an emergency sealant instead!

Be sure to also check out these 0w-20 synthetic oils that I also compared! Plus, here is the price history on Amazon:

Price history for No Leak, All in One Stop Leak on Amazon


CRC Transmission Leak Sealer

CRC Transmission Leak Sealer

Highlights
Fixes transmission problems in a snap
Saves money on expensive repairs
Easy to use, just pour it in
Can be used on power steering fluids too
Eliminates vibrations and other issues

‎CRC brand transmission leak sealer is nothing short of a miracle worker when it comes to fixing transmission problems. With just a simple pour, this powerful sealer gets to work, effortlessly sealing leaks and saving you from expensive repairs. It’s like having a superhero for your transmission!

What sets ‎CRC apart from other leak sealers is its versatility. Not only does it work wonders on transmissions, but it can also be used on power steering fluids, providing an all-in-one solution for your automotive needs. Talk about convenience!

One of the standout features of ‎CRC is its ability to eliminate vibrations and other issues that can arise from a leaking transmission. It’s like giving your car a spa treatment, leaving it running smoothly and without any hiccups.

Using ‎CRC is as easy as pie. Just pour it in and let it do its magic! The instructions are clear and straightforward, making the process hassle-free even for those who aren’t mechanically inclined.

Overall, I highly recommend ‎CRC brand transmission leak sealer for anyone experiencing transmission leaks or related issues. Its effectiveness, ease of use, and money-saving capabilities make it an excellent choice for both professionals and DIY enthusiasts alike. Don’t let transmission leaks dampen your driving experience when ‎CRC can fix them in a snap!

Be sure to also check out these transmission fluids that I also compared! Plus, here is the price history on Amazon:

Price history for CRC Transmission Leak Sealer on Amazon


Liqui Moly 1042 Gearbox Oil Leak Stop - 50 Liter

Liqui Moly 1042 Gearbox Oil Leak Stop - 50 Liter

After using it, I noticed that the leak was still present.

The back of the bottle claims that it is compatible with all common transmission fluids, but this wasn’t the case for me - it caused an inconsistent shift in my gears when used on a Honda Civic. Overall, I didn’t feel that it provided any real results.

The product also has an unpleasant smell, and although it’s easy to apply - with just four steps - I don’t think this product would be beneficial to anyone who needs to repair a transmission leak. I think that there are much better sealers out there, so if you’re looking for one then I’d avoid ‎Liqui Moly’s transmission leak sealer.

Here is the price history on Amazon:

Price history for Liqui Moly 1042 Gearbox Oil Leak Stop - 50 Liter on Amazon


B. B. Lykert

B. B. Lykert

Chief of Reviews

I've always had a knack for reviewing products ever since I was a child - heck - I still kind of am a kid (at heart).

Expertise

Deal Finding
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