K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

My 2012 Ford Focus was losing a pint of coolant per week with no external leaks. The small bubbles in the overflow tank indicated a head gasket leak into a combustion chamber. One bottle of K Seal Ultimate added to the overflow tank fixed the leak after 50 miles of driving. This stuff actually works! But watch out. The label states it is not for hose leaks, oil to coolant or coolant to oil leaks.

Jeep Wrangler 4.0 Inline 6. Had an issue with a piston and suffered a catastrophic failure. Disassembled engine, and replaced piston, then reassembled with a fresh head gasket. Did not plane block or head, just put it back together. Engine ran fine, but I noticed lack of coolant system pressurizing, and I was refilling the radiator daily. I found a pressure leak near number 1 cylinder, which was causing significant coolant loss when engine was operating. My head was either damaged or I nicked the gasket when putting it back together by myself. Which is possible, that head is heavy and awkward. Anyway, after a lot of reviews and research, I selected K-seal. I followed instructions and added it directly to radiator. It has small copper looking flakes in it, and at first I thought it was a waste of time, because after pouring it in, and going for a drive I saw the same small flakes on the inner fender where the steam from the leak was coming from. Then after a few more days, I noticed that my cooling system was fully pressurized when hot, and the coolant was not disappearing every day. It has been about three weeks and several hundred miles, and it is solid as a rock. No coolant leak, smell or refill needed. Very impressed, this really worked.

Did not work for me after trying 2 bottles at 2 different times first bottle sealed everything up almost immediately and lasted maybe 3 days at the most added 2nd bottle sealed everything up truck sat overnight the next morning drove the truck about 30 miles and it worked fine. I let the truck sit for about 3 hours started up and the head gasket started leaking again . It won't seal every head gasket leak and if it does seal a heat gasket leak you don't know how long it will last .

It did not fix my problem. I guess it’s a real gamble.

Excelente producto muchas gracias al vendedor

My honda k20 had been burning off coolant. I couldn't find anything suspicious except for a smoking exhaust. I decided to add this in, and while the result wasn't instant, I did not have to refill the coolant again other than a small top off to normal levels. No more blowing smoke, and have been driving fine for several months. I am still on the side of caution driving only local roads. I haven't worked up to driving more than 50 miles on a single trip yet.

This product works just as advertised, I saw 👀 a difference in 5 minutes.

Purchased and used several times - different engines.Has performed as advertised / expected (successfully sealing) each time.Strongly recommend. (Shop when price reduced for extra savings. Keep on hand)