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

Have a 2004 Ford Escape with about 200,000 miles. Started getting a check engine light; misfire on #1 at startup and very rough idling every time I started the (cold) engine in the morning until it warmed up. Tried the usual; plugs and ignition coils but no help. Noticed I was using water but no sign of a leak. Finally suspected that I had a blown head gasket around #1 cylinder. Read good reviews about K-Seal so thought I'd give it a try and poured a 16oz bottle in. Drove it around for about 20 miles then parked it till next morning. Started it up and no check engine light and the idling was much improved (but not great)! I left the K-seal in and now, about 3 weeks later, have not had a check engine light again and the idling has improved steadily until I can say it is now very smooth at startup and when stopped in traffic. I think by leaving the K-Seal in that the gasket leak has steadily improved and so has the engine performance. Thank you K-Seal!

After fixing all of the external coolant leaks, I was still having to refill my overflow tank every three days. After adding your product, within a week the level of coolant stopped dropping and now there is no need to add coolant. It has been over 3 weeks since changing my oil which, was the same time I added the head gasket sealer. For 3 years I have added both coolant and oil on a weekly basis to a truck that drives 100 miles a day, that is every day, I no longer have to add any oil or coolant. I am so impressed with these results, I wanted others to know. Thank you so much for probably adding thousands of miles to the life of my truck. I thought I needed to replace the motor prior to adding your product. Now I don’t worry about it. Thank you.

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

2013 Ford F150 4X4. I had a small head gasket leak. Followed directions to a T. Within 3 minutes after a full warm up of the engine, my leaked stopped. I drove it about 15 miles, brought back home. Let completely cool down. Drove again next day, still no leak. I am very happy with this product's results. I highly recommend this over Blue Devil.

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 .

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.

Why did you pick this product vs others?:Well this did the trick, and as shown or expressed on social.

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.