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prestone as661 engine block stop leak with kevlar: powerful 16.5 fl. oz. solution for effective leak repair logo

Prestone AS661 Engine Block Stop Leak with Kevlar: Powerful 16.5 fl. oz. Solution for Effective Leak Repair Review

5

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Average

Revainrating 3.5 out of 5  
Rating 
3.6
🚙 Car Fillers, Adhesives & Sealants, 🛠️ Car Care

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Description of Prestone AS661 Engine Block Stop Leak with Kevlar: Powerful 16.5 fl. oz. Solution for Effective Leak Repair

Triple seal protection made with DuPont Kevlar. Stops cooling system leaks fast without blocking or corroding the cooling system. Designed to seek out and seal leaks when added to any color of antifreeze/coolant. Affordably fix engine block leaks and avoid expensive engine repairs. Latest evolution from the leader in cooling system products.

Reviews

Global ratings 5
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Type of review

Revainrating 1 out of 5

This product does not work on my machine. The .

This product does not fit in my car. This raised the temperature of the coolant, the increased coolant pressure tore through the cover and squirted coolant everywhere.

Pros
  • Stylish and modern design
Cons
  • unreliable

Revainrating 2 out of 5

Will not freeze in storage

Bought all three Prestone Kevlar sealants (head, block, etc.) to use on my tractor. However, I've never been able to use any of them. What the instructions don't tell you is that the clear liquid in the sealant will expand and rupture the clear plastic container if stored in an unheated garage that can drop below 32 degrees Fahrenheit. What a mess! I had to dispose of all 3 containers. I will buy again in spring!

Pros
  • Loads of positive vibes
Cons
  • No form required

Revainrating 5 out of 5

I never thought I would live.

Finally! A coolant leak remedy that really works! Over the years and on many engines I have tried every product that has ever been offered to stop minor leaks anywhere in the cooling system (certainly not in the water pump drains). All were also recognized ... crap, which did nothing to solve the problem. Nothing has worked before and no one I know has ever patched a hole/crack with other products. Guys I'm here to tell you guys I performed the Happy Miner's Dance after realizing that Preston's

Pros
  • Few competitors
Cons
  • Expensive

Revainrating 5 out of 5

I saved my v8 block in sealant

Purchased this item last year on a 1995 Ford F150 with a 302 v8. Unfortunately the block broke and before I bought it my engine was burning quite a bit of coolant and was blowing a lot of sweet smelling white smoke out of the tailpipe. I followed the instructions on the bottle exactly and started the engine. The smoke continued for about a minute before completely disappearing. It was over a year ago. The engine no longer loses coolant and I drive my truck through Alaska every day. It literally

Pros
  • Dope 🔥
Cons
  • Expensive Insurance

Revainrating 5 out of 5

It really works! in Fillers, Adhesives & Sealants

Driving my 1993 Chevy S10 pickup, I smelled the familiar smell of antifreeze leaking. Of course, when I stopped, I noticed an antifreeze leak under my engine block. I realized it wasn't one of my hoses and it could be coming from one of the freeze plugs. I didn't want to use my AAA so I researched and spoke to my mechanic. He recommended STOP THE LEAK. I found Pep Boys nearby and saw several products claiming the same to stop leaks. I bought PRESTONE Engine Block Leak Prevention for $11. I…

Pros
  • handy item
Cons
  • so far so good