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

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 saved my block and continues to do so without reapplying. I think my favorite feature is that the coolant doesn't gel or become viscous. Very impressive! Thank you Preston!