Do Stop Leak Products Work? Do They Damage Engine Seals? Will They Destroy an Engine? Let's Find Out

Stop Leak Products: AT-205, Lucas, Bardahl, Liqui Moly, Bar’s Leak, Lubegard, Hapco, Blue Devil, XADO, Seal Lube, CD-2, Justice Brothers, Wynn’s. Do "Stop Leak" Products Work? Do they cause damage to engine seals? Will they destroy an engine? Stop leak products compared for their ability to condition or soften hardened rubber engine components, impact on new rubber engine parts, ability to resist evaporation under normal engine operating conditions, and film strength or the ability to lubricate engine components. I buy all of the products and the supplies used to perform the testing to ensure an unbiased review. So, thank you for supporting the channel!

➡ Thank you for supporting the channel through memberships:
➡ As an Amazon Associate I earn from qualifying purchases.

➡ Products Tested In This Video (in no particular order):

Videography Equipment:

This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume the responsibility for the results. Project Farm LLC

[VIP-ryvv]

I know the internet oil pundits give your testing process a hard time, but it's massively better than hearsay and anecdotes. Thanks for the hard work, I appreciate it.

[davidr]

I think I speak for EVERYONE who works on their own cars and trucks when I say thank you for everything you do.. Your channel and the tests have been a never-ending fountain of knowledge, entertainment, and help. -- Dave Raynor, Long Island, NY.

[KenRippy-txje]

I'm a mechanic of 40 yrs and I love your videos and the way you test . You make the world a better place.God bless you sir . Ken!

[motoguy]

Wow. This was an epic side-by-side test. A huge thanks from the YouTube audience at large for taking the time and money to put out such an educational video. You never cease to impress!

[meversace]

Everytime you start with a different test my brain spends a little time trying to understand what you're doing, and then spends the rest of the time trying to figure out how you even think of all these tests let alone build them or put them together. You never cease to send my entire brain into some sort of stutter. Always impressed.

[max_power]

I bought the AT-205 based off Scotty Kilmer's channel and just before putting it in my engine, your video came out, so I was really happy to see how it performed versus the other products. I agree with you to repair thing's properly, but sometimes it is fun to enjoy a little "magic in a bottle" when we don't have time. If I were the President of the United States of America I would definitely give you the Presidential Medal of Freedom. Thank you for your hard work Todd. It shows and we definitely notice.

[KS_Husker]

Great video. I've used At-205 in 3 occasions where I didn't want to deal with a complex assembly that was leaking and all 3 times it completely stopped the leak. One of them was on a lawnmower that was not all that complex, but not worth my time to mess with. It was leaking like a pig, I poured this stuff in thinking I just wasted 20$, there's no way it would do anything. And to my amazement I was wrong, it completely sealed the leak and when I sold it 4 years later, it was still running great and dry as a bone all around the base where it was leaking originally. This stuff truly is amazing.

[ManiacMeats]

....and joined. These tests are awesome! I appreciate the unbiased testing and an opportunity for every product to duke it out!

[suthernsuperman]

It always amazes me how you come up with real world test jigs. Well done

[cyphre]

Should start adding a 'just water' control for your lubricity test, considering how bad some of these additives got! Loved the addition of Snake oil!

[zingobangee]

Thank you again.
The information that I am
able to glean due to your
consistently high level of
testing is Very useful!
I use your testing results to help me keep an eye on the changes and help with decisions on products that we both need more information on.
Again, Thank you.

[calk]

I've been watching for a while and I just wanted to take a minute to voice how much of an impact you have had on my life. I am going to school for engineering and your videos are entertaining, engaging, and educational unlike most course content I have seen. I've learned a lot about keeping tests limited to one variable, controlling variables, designing tests, and much more. I really appreciate what you do and how transparent you are in your content. Theres a lot more I love about this channel like the pace, energy, information, etc.

[PixelatedFancyLads]

Idea for your next video: Garage floor coatings! Compare a few polyaspartic, polycuramine, acrylic, and epoxy options to figure out which coating last the longest, has the best slip resistance, best impact resistance, etc.

[krayzeejojo]

I've been dealing with a microscopic oil leak in my timing chain gasket for a couple of years now, but neither have had the time nor money to have it manually rebuilt. This definitely helped much better, once I weigh the pros and cons of each of the products you've tested here on a 9-year-old Toyota that's just a little past 285k miles. Thank you again for your test videos as this one came in most handy, so far. Keep rockin', PF!

[Oakleyde]

Just joined after looking through several videos from other people. Your info and testing is leap years beyond the vids I had been watching. Thank you for all your work on this.

[prannermedia]

I’ve been selling many of these for a few decades. ATP AT-205 is considered a “re-plastifier” and performed as I expected. Another great use for the AT-205 is wiping vehicle door gaskets before and after winter, also spraying it on suspension bushings. It can even extend the life of air suspension components in expensive luxury vehicles. Great job! Love the channel.

[drakeringholz]

I used the at205 for a leak in the rack and pinion of my truck and it worked amazingly and didn’t leak a single drop for about 3 months. The leak has come back now but it was such a significant leak to begin with that I’m surprised it did anything at all, plus it gave me more time to save up some money to actually fix the problem

[calenmoerman]

Your videos are so thorough and enjoyable. So nice to see the answers occur to things we've wondered about for years or where people have spoken on forums as if their guesstimate was fact, but now we really get to see it. Always exciting.

[wtdonovan]

I love this test. We grow up seeing these products on the shelf in the parts store and a person always wonders. I feel like you shined a light on a corner of the room I didn't have a means to do for myself. Priceless. Also I'm going to try this with confidence on a small leak now.

[darkmugetsu]

Great to see how easily AT 205 softens rubber. I don't use it to stop leaks but instead put it in a spray bottle and spray my 30+year old rubber suspension parts once or twice a year to slightly rejuvenate the aged rubber a bit since it is a plasticizer fluid and one of the main reasons rubber hardens is due to loosing plasticizer in its compound.