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Pros & Cons - ATP Leak Stoppermetaspencer

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ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

Brand: ATP Automotive

4.5 18,927 ratings

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in Engine & Oil Fluid Additives

$17.71 with 5 percent savings

Typical price: $18.70

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Purchase options and add-ons

Brand	ATP Automotive
Style	Compact
Item Weight	50 Grams
Item dimensions L x W x H	7 x 4.5 x 4 inches
Compatible Material	Rubber

About this item

Professional strength fast acting resealer, stops leaks fast
Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
Compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
Does not contain petroleum distillates, will not over-swell or breakdown seals
8oz bottle will treat a 6 quart capacity, adjust accordingly

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Product details

Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 7 x 4.5 x 4 inches; 1.76 ounces
Item model number ‏ : ‎ AT-205
Date First Available ‏ : ‎ July 7, 2004
Manufacturer ‏ : ‎ ATP
ASIN ‏ : ‎ B000NVW1LM
Country of Origin ‏ : ‎ USA

Best Sellers Rank: #277 in Automotive (See Top 100 in Automotive)
- #1 in Engine & Oil Fluid Additives

Customer Reviews:
4.5 18,927 ratings

WARNING: California’s Proposition 65

Product Description

AT-205 Re-Seal is a fast, effective and safe stop-leak for all rubber seals and gaskets. The exclusive formulation restores worn or dried out seals and is not harmful to internal bearings and components.

From the manufacturer

AT-205 Re-Seal - How it works


AT-205 added to leaking system AT-205 Re-Seal is added to any leaking engine, transmission, power steering system, differential or hydraulic system (except for brakes) to condition rubber seals/gaskets and stop leaks. Simply pour it in as you would be filling it with oil or fluid.	The formulation blends with the oil The additive blends with oil in the system and is circulated throughout during operation, treating and conditioning rubber seals and gaskets.	Conditions and rejuvenates seals AT-205 is a plasticizer, a type of chemical used in rubber manufacturing to set hardness and flexibility. As a seal or gasket gets older it can dry out, harden and wear - treating it with AT-205 will rejuvenate it, restoring it's flexibility and sealing properties.	Most leaks resealed within 5 hours As long as the seal or gasket is not severely damaged or torn, the leak is resealed after a total of 5 hours of driving - saving time and money from costly repairs.

What's in the box

1 Bottle

Looking for specific info?

Customer reviews

4.5 out of 5

18,927 global ratings

How customer reviews and ratings work

Customers say

Customers like the performance of the sealant. For example, they mention it works well and has no issues. That said, opinions are mixed on oil consumption, seal quality, and leakage.

AI-generated from the text of customer reviews

1,446 customers mention1,062 positive384 negative

Customers like the performance of the sealant. They say it works great, has no issues, and is worth the price. Some mention that it works well for dried out and cracked seals or gaskets.

"...So it’s been since June of 2023 and still no leak and no ill 🤒 effect that I can tell otherwise...." Read more

"Worked nice the first month then it started leaking more... lucky is not a bad leak" Read more

"...A few weeks later I started getting a misfire on cylinder 1, I suspect it's a bad lifter - making a nasty metal on metal ticking noise...." Read more

"...This works great for dried out and cracked seals or gaskets, but if it’s completely torn it will rip it open more. 2, be careful buying off amazon...." Read more

1,707 customers mention904 positive803 negative

Customers are mixed about the leakage. Some mention that it completely stopped a leak from the steering rack area, while others say that it still looks to be leaking.

"...I am astonished that not only did it work but it has completely stopped the leak all together (I was just hoping for a reduction honestly) So it’s..." Read more

"Worked nice the first month then it started leaking more... lucky is not a bad leak" Read more

"...After 4-5 hours of operation, the seal leakage stopped. In addition, the slight leaker around the hydraulic couplers also diminished or stopped...." Read more

"...You know what the best part is? The rear main still leaks.Avoid." Read more

213 customers mention124 positive89 negative

Customers are mixed about the seal quality. Some mention it helps to restore seals and re-hydrates them, thereby reducing oil leaks. However, some customers say that the seal was still hard and brittle, and that it only works for rubber seal leaks and very tiny leaks, since the rubber seals don't appear to swell.

"...This stuff literally insures your vehicle head gasket! I have full confidence in this product!" Read more

"...change and most of a bottle of At-205 for about 5 miles, the motor started knocking and the oil light came on. Had to have it towed back...." Read more

"...check on things and was amazed at how well this product worked to soften up those seals to stop the oil leaks...." Read more

"...seems that it would only seal very tiny leaks, since the rubber seals dont appear to swell (within human perception)...." Read more

173 customers mention105 positive68 negative

Customers are mixed about the oil consumption. Some mention there was not ONE drop of oil anywhere, while others say the oil pan and transmission were covered with oil.

"...So far, there has been no sign of a leak, and the oil level has remained consistent. Either the mechanic was lying, or this stuff is miracle fluid!" Read more

"...Before long, the oil pan and transmission were covered with oil. I was losing about 1 qt per 1500 miles. Put in a full bottle with an oil change...." Read more

"...It’s been 3 months now and no more oil spots on my driveway. Very happy with this product. Thank you Scotty Kilmer!!!..." Read more

"...Now already ten months passed and the oil level on the dip stick is good. No more leaks.This is really an amazing product...." Read more

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Top reviews from the United States

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A.J.

This stuff works!!

Reviewed in the United States on April 12, 2024

Size: 1 Count (Pack of 1)Verified Purchase

I used this to stop an irritatingly significant leak from the transfer case of my 2000 Toyota Tacoma. It was a bit of a “Hale Mary” before I just resigned to the fact that I was going to have a leaky truck and be mindful of where I parked and be sure to keep it filled. So I gave it a shot and I am astonished that not only did it work but it has completely stopped the leak all together (I was just hoping for a reduction honestly) So it’s been since June of 2023 and still no leak and no ill 🤒 effect that I can tell otherwise. I found out about it on a forum and couldn’t find it at my auto parts store. Amazon came through..

5 people found this helpful

Helpful

Dr. D.

Saved Me a Lot of Money!

Reviewed in the United States on March 30, 2024

Size: 1 Count (Pack of 1)Verified Purchase

This product works! I put three bottles in the hydraulic reservoir of my John Deere 1025R after I developed a seal leak. The seal leak started when tall grass got wrapped around the driveline during mowing, causing overheating of the seal. It was leaking badly, and the estimate to replace it was eye-watering! I figured I had nothing to loose, so I tried this product. After 4-5 hours of operation, the seal leakage stopped. In addition, the slight leaker around the hydraulic couplers also diminished or stopped. It'll now be a standard additive during hydraulic fluid changes.

7 people found this helpful

Helpful

Joy Ord

My valve covers which are rubber now leak more

Reviewed in the United States on April 2, 2024

Size: 1 Count (Pack of 1)Verified Purchase

Worked nice the first month then it started leaking more... lucky is not a bad leak

2 people found this helpful

Helpful

Amazon Poster

It worked for my 2003 Passat's power steering

Reviewed in the United States on January 24, 2024

Size: 1 Count (Pack of 1)Verified Purchase

I added ATP-205 to my 2003 Passat's power steering in 2019 (more than 4 years ago). It has almost completely stopped a leak from the steering rack area where the inner tie rod is mounted. I assume it swelled some shrunken o-ring on the cylinder that extends/retracts as the wheel is turned. It is only good for very specific cases like that. If you have a leak from metal or a bad hose or something then it won't do anything.

Other details:

I did not follow internet wisdom to just "pour it in" to the reservoir. Instead I bought a quart of OEM power steering fluid and calculated the ratio and mixed that small amount into the quart so that I would have premixed fluid on standby. I took a few ounces of power steering fluid out of the reservoir and added some of that premixed fluid in its place. I went about my normal driving and waited for it leak back to the MIN level. Once it did I think it was like a week later. I added some more of the premixed fluid to get back to MAX. I did that several more times. Eventually the leak all but stopped. I still have to add fluid but it is very rare, like so rare I can't remember when I last did it.

Note I shook up the premixed fluid before I added it. In some fluids ATP-205 can separate over time and sink to the bottom. I'm not sure if that's the case with my power steering fluid mixture but I shook it as a precaution.

7 people found this helpful

Helpful

Hunter M.

WARNING

Reviewed in the United States on January 6, 2024

Size: 1 Count (Pack of 1)Verified Purchase

This stuff works fantastic, there’s only two things you should know. 1, if the seal is torn or ripped, this will make it worse. This works great for dried out and cracked seals or gaskets, but if it’s completely torn it will rip it open more. 2, be careful buying off amazon. This stuff is obviously a chemical, and it has very specific storage instructions, and I bought 2 bottles from an Advanced Auto near me and they worked great for each application. The one I bought off Amazon was a dud and did absolutely nothing, bought one from in store instead and it worked just like it always does. So just be warned, if you buy one off amazon and it doesn’t make it either better or worse, try picking a bottle up in person and dumping it instead (never exceed the recommended dose, drain first and then add again)

37 people found this helpful

Helpful

Kai Starr

Seems to have worked!

Reviewed in the United States on April 13, 2024

Size: 1 Count (Pack of 1)Verified Purchase

A somewhat shady mechanic told us our car had a MASSIVE oil leak that would have to be fixed at some other shop that he was part of. We hadn't seen any oil on the ground, but it looked like someone at the shop had poured or spilled oil on the crankshaft. Just to be safe, we added this to the engine oil. So far, there has been no sign of a leak, and the oil level has remained consistent. Either the mechanic was lying, or this stuff is miracle fluid!

One person found this helpful

Helpful

Jazzbandit1313

Caused major issues on 09 Tahoe

Reviewed in the United States on February 12, 2024

Size: 1 Count (Pack of 1)Verified Purchase

I've had a slow rear main seal for years on my 09 Tahoe. Decided, what the heck, this stuff is reviewed to death and everyone seems to love it. Got my oil changed and threw a bottle of this in there.

A few weeks later I started getting a misfire on cylinder 1, I suspect it's a bad lifter - making a nasty metal on metal ticking noise. Now, GM 5.3 v8 trucks from this era are known for having lifter issues around the 100-120k mile mark like my truck is at, so this likely just sped up an issue that would have happened anyway...however I wanted to write the review and forewarn others who might have a similar truck that's at or above 100k miles...be careful. This stuff likely changes the viscosity of the oil and/or re-hydrates bits of seal that could be floating around, causing blockages.

This repair will likely cost 1500-3000 just for new lifters, and that's if I don't want to disable the AFM system entirely which would be more, and also if I don't need a new camshaft which would be yet another thousand. This truck isn't even worth all that much on a trade in anyway but still...really sucks to be forced into buying another vehicle.

You know what the best part is? The rear main still leaks.

Avoid.

12 people found this helpful

Helpful

hans

Just F'in wow....

Reviewed in the United States on April 29, 2024

Size: 1 Count (Pack of 1)Verified Purchase

Bought a 2013 honda accord v6 automatic with 80 000 miles
.. both front and rear main seals were peeing oil... reason I got it for a great deal below market... since the labor to do these seals means dropping engine out the bottom... it sucks... but I was ready to do it.... figured try this stuff out first. Why not? Let me tell ya and show ya. This stuff has just saved me an entire weekend of work... or 800 dollars at a shop... I'd tried two local parts stores versions of stop main seal leak stuff... while waiting for this to arrive.. neither did much.... with multiple days of driving .... cycling the engine etc... . Within 96 hours of this being in motor, look at pics.. before and after... just wow.... well worth the purchase. The before pic was from parked 30 min. The after pic is after overnight... will be buying 5 more....for just in case ... just wow...

Helpful

Top reviews from other countries

Translate all reviews to English

bradley long

worked great

Reviewed in Canada on April 25, 2024

Size: 1 Count (Pack of 1)Verified Purchase

worked great

Emilio Heredia

Me ahorró la reparación en el taller mecánico

Reviewed in Mexico on June 28, 2023

Size: 1 Count (Pack of 1)Verified Purchase

Mi automóvil tenía una pequeña fuga en la zona del empaque de las cabezas del motor (headgasket). Le puse 2/3 de botella y dejó de tirar aceite.

Translate review to English

Trev

This really works.

Reviewed in the United Kingdom on March 1, 2024

Size: 1 Count (Pack of 1)Verified Purchase

I am astonished at how quick the leak sealer has worked on my car. I have a BMW e92 at 150K miles with n54 engine which is known to leak from the sump pan gasket on older or high mileage cars. The oil leak seeps down on to the catalytic converter and causes a strong oil smell within the car, particularly when pulling up at lights etc. Also makes a mess of the under tray which covers underside of engine and gearbox., and if left, drips onto the ground under the car. The pan gasket is a Labour intensive and expensive replacement at a garage and a complete pain if tackled at home for skilled owners (special tools required). I was a bit sceptical about how well the sealant would work, but considered it worth a try before committing to gasket replacement. Within a few miles of running the car the leak has ceased completely and the burnt oil smell has gone. Works on any rubber based seals on just about any car, so if you have a leak do give it a try. I am a time served auto technician and absolutely endorse this product.

vikash kumar bhagat

Excellent product

Reviewed in India on March 29, 2022

Size: 1 Count (Pack of 1)Verified Purchase

I used this product in my JCB MACHINE ITS WORKS REALLY NICE MY HYDROLIC LEKAGE IS STOP

2 people found this helpful

Howard T

It works !

Reviewed in Australia on April 22, 2024

Size: 1 Count (Pack of 1)Verified Purchase

Restores seals very well. Put it in a spray bottle. New life to old rubber.

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ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

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Product details

Product Description

From the manufacturer

AT-205 Re-Seal - How it works

AT-205 added to leaking system

The formulation blends with the oil

Conditions and rejuvenates seals

Most leaks resealed within 5 hours

What's in the box

Videos

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Pros & Cons - ATP Leak Stopper

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Customer Review: B+ . Sorry Mechanics

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Customer Review: Amazing product!! Highly recommend

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How to add AT-205

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Customer Review: Differential / axel seal

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