AT-205 Seal Leak Stopper 8 Ounce - 2 Pack

My daily driver truck is over twenty years old. It has over 180k miles. We take care of each other. I have always attempted to take great care of her and in turn she's still very reliable. In the attempt to keep it running properly I've been adding Seafoam (one ounce SF per quart of oil) to the crankcase about 100-150 miles prior to an oil change to keep the valve train cleaner per advise from some old timers who know how to properly maintain engines. Once the odometer rolls another 100 or so miles I've drained the old oil while it's warm and refill with fresh synthetic high-mileage oil (high-mileage oil supposedly has extra additives to keep seals fresher). The last time I planned on changing my oil I added the 1oz/1qt Seafoam. I then got too busy and did not change it right away. After about 300 miles of driving the truck after adding the Seafoam I noticed an oil leak at the rear main seal area. I immediately suspected that the Seafoam solvent did exactly as it was supposed to do: clean up and dissolve old oil crud and grunge. Some of this crud was probably around the rear main seal area keeping that old seal from leaking. Like many who work on their own vehicles I resorted to YTube to get ideas to remedy the fresh oil leak. After watching many videos (some from seamingly honest mechanics) I ordered the parts needed to replace the failing seal. I also discovered many who claim they have had good success with a seal-refreshioning product called ST-205 made by ATP. I decided to order a couple of bottles of that too. See, the thing about older vehicles is that, in my experience, once a repair requires removing several components to access one that needs repaired or replaced sometimes you end up going all parts-cannon on it. Rather than fixing just the one issue you discover that by simply removing components you end up damaging other seals, gaskets, parts, etc. or things don't seem to go back just right. The temptation then is to open the billfold and attempt to do the "right" thing and replace anything suspect to failure. This is expensive, very expensive. So, I know that my initial reaction to the cost of ST-205 was like, "Woah, this stuff is costly," doing the in-depth seal replacement could be way more ouchy to the balance ledger. So, after receiving the ST-205 miracle juice and the parts to replace the rear main seal I added the recommended seal juice to the crankcase after the oil change. I then drove 150 miles to help a family member out. My truck remained in their driveway for three straight days not being used or started. I was traveling with the family member in their vehicle. Later that week I was about to start the truck and start the 150-mile trip for home. I checked the surface of the driveway under the truck for any oil drips. None. I checked the oil level on the dipstick. Perfect. After a month and a half and about 1400 miles since adding the ST-205 the truck has not leaked oil at all. At 183k miles she does use a little bit but oil is not leaking from the engine. I am happy with the ATP ST-205. It worked as claimed. The new rear main seal parts are now on a shelf in the garage whenever they are needed. If the ST-205 stopped a rear seal leak I can only hope that having it in the old truck is refreshing all the oil seals extending the entire truck's overall dependability. I would definitely recommend this stuff. Thanks ATP for manufacturing a good product as a reasonable price.

I was never a big believer in using additives as a cure for automotive issues but after some prodding by a friend, gave this a shot and it worked. The vehicle was an older car with over 250K miles on it and it had developed a slow oil leak that I suspected was the rear main seal. While the car ran great, it wasn't worth the what it would have cost me to pull the engine and relace the seal but it was making a mess in the driveway and forcing me to add oil between changes. I added this to my oil per the instructions and the leak stopped. I wasn't holding my breath and would have bet that it would have just leaked out with the oil but I ended up being pleasantly surprised. This time I'm going to use it in my boat. The engine has developed a leak that I think located on the front timing cover. It's a pretty severe leak and I do intend to fix it but for the moment I want to see if this stuff will help slow it down until I can get to it. Additives such as this have limitations to what they can cure and my bet is that this leak is too great for this to stop it but for the price it's worth giving it a shot.

This is an amazing product. It is not cheap for the quantity that comes in the bottle, but it is indeed a great product. I haven't used yet on the oil or steering fluid (which is its original purpose), but to rejuvenate rubber parts of the suspension, as Scotty Kilmer and other youtubers recommended. It can be placebo effect, but I feel my suspension compoments softer. Try it yourself.

It works but occasionally, takes time. Sometimes simply wont work. I came here after scotty kilmers YouTube video. It's easy to use though. I used it for valve gasket leak and power steering leak. It stopped Power steering leak but not the valve cover gasket

Great stuff, skeptical at first. One of my cars (2005 Ford), power steering was poor intermittently (would go from 85% assist to 40%). Finally totally failed (0% assist) and was dangerous to drive. Decided car was tired, rusted and had other issues (145K). I was not going to put in a rack and pinion and pump and as a last "hail Mary" event. I flushed power steering again (had done it 18 months earlier) and added TWO bottles of AT-205. I was totally ready to send car to junk yard. I drove it locally (not much) and slowly it got better, 20% then 40% then 60%, then 80% now 100% (still is) I was very impressed. Second proof to me was I had a shuttering transmission lock up torque converter (2005 Honda Odyssey). Van was new to me in 2020, then after multiple drain and fills I got shudder MUCH reduced (90% less). it never got better, then last time (Transmission oil change) I figured "what the heck" and put in a bottle of AT-205. Took a while, but now shudder is gone 99%. The way this stuff works is it does not SWELL rubber (like many others) but makes rubber seals/O-rings etc. soften and be more pliable. if you add to oil then drain it out you need to add it again next time to continue the metamorphosis on old rubber etc. If you add to a seldom changed thing like power steering fluid or transmission fluid it is fine for HOWEVER long that fluid is there. But if you use it to help seal a weeping motor oil leak, when you change the motor oil you must re-add it next oil change. (because you effectively drained it out). Takes about 5 hours of running time to "revitalize" whatever (seal, O-ring etc.). Do not expect instant results! Total believer now (and I was skeptical and thought "yeah right")

Fantastic product. Had a small (3-4 ) drip per day coming from my main seal on a Honda Odyssey and after a few days of driving it with this additive, the drip is gone. Revitalized my seals and prevented me from a very large repair bill.

Item as expected

This thing really works! Very impressive!

AT-205 Re-Seal stop leak !Used on my 2009 Ford SUV . First time I bought I added only one bottle . I should have used both . After oil & filter changed I start my SUV let run for 5-15 min. Depending on outdoor temperatures. Add to your oil and go for 30-60 min drive . Longer the better! We get cold winters in Alberta & first time I tried I didn’t drive enough the first few days ! 2nd try I had motor warm added both bottles & drove on highway an hour , after approx 300 km later my SUV ran like new ! Keeps all rings, rubber gaskets and seals lubricated , had P0304 & was worried piston ring needed replaced . Had fuel slowly going in my oil from misfires. Oil leak from oil pan gasket! I was told always add to warm motor after oil change and drive vehicle min 30 min ! Longer the better ! No leaks & SUV runs perfect! Best product I’ve tried a few & AT-205 RE-SEAL worth every cent ! I can’t remember who tested this product on you tube , will update this review with You Tube Video name ! Amazon only sells this. Haven’t ever seen in any stores in Alberta! 5+ STARS ! I have no leaks & use now only on bottle every time I change my oil. Update, with Penzoil Platinum synthetic oil only use half a bottle to keep seals, rings, in good shape! Amazing Product! Thanks Scotty! Use on all rubber in a spray bottle as well. It's a product we now always have some at home! My husband, kids, use it as well now!

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This is one of the best rubber and gasket restorer thus the reseal part of its name. It has many uses and can be used with rubber bushing to prolong its life and prevent cracking. It will help with other rubber parts that harden and dried out but not yet cracked and restore it to its former glory.