K-Seal Ultimate

I have a 2012 Toyota Prius type v they're generation known to have head gasket issues over time. Well my time had come last winter Winter of 2024 and I was deciding whether to put new engine in it though I did not have the money and I called a repair shop in town called engine and transmission exchange and told him I dilemma. Well to my surprise The gentleman behind a counter felt my problem and told me try this he had a guy who delivered parts who had a old Chevy van that had the same head gasket issue. He gave it a shot because one of his mechanics told me to try it what's the worst that could happen. By God it worked that man has been driving that same vehicle for 5 years now so I gave it a shot. It's a year later I've had no head gasket issues whatsoever no overheating no loss of fluids since that time I put it in. Heck of a lot cheaper than the engine. A $23 bill is a heck of a lot cheaper than a 5 to $6,000 engine replacement.

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!

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 at all. May or may not work depending on your vehicle.

I used K Seal in my 2015 F150 that had a bad head gasket at around 150k miles. I drive this truck hard and pull a lot of trailers, so it definitely gets worked. So far, the K Seal has held up for a few weeks now, which honestly surprised me given the condition of the truck and how I use it. No overheating and no obvious signs of coolant loss since adding it. Is it a permanent fix? Probably not — but for the price, it’s a solid budget alternative to try before spending thousands on a full head gasket repair. If you’re in a pinch or just want to see if a sealant will buy you some time, this is worth a shot. Would recommend as a temporary or first-try solution.

I was smelling some coolant when I’d get out of my 2016 Kia Sorento and refilling the reserve tank about every 2 months. No puddles anywhere and no overheating. I’m pretty sure it was a small leak on the water pump but not 100%. I put this in and cycled it through 3 times. Smell went away instantly and level has not moved after a few months. Great product and vehicle running perfectly still.

Head gasket leak means there will be some leak like coolant to oil contamination etc or vice versa, if it doesn't fix it then what's the point of their claim that it can fix any Head gasket issue? Their money back guarantee is a joke too since there is no info on their website how to get the money back if it doesn't work, all useless marketing gimmicks with customers. Got a lot of views from people I know on this product, they say it doesn't work or could work only for short time and problem will come back. Waste of $22

Had bad coolant blowing out the exhaust on my 1989 Chevy 5.7 K1500 111k miles. Not just steam but coolant as well. Used K Seal and it did not work. So pulled heads sent to machine shop that checked them and said no faults found. Heads milled, inspected cylinders, nothing found. In fact old cylinder head gaskets and intake gaskets were okay. Re-assembly did not touch the exhaust. Just as bad. I again used K Seal. Forget the 3-5 minute idle, did not work. So allowed it to cold soak overnight. Next day ran it on the road with it blowing steam all the way. Let it cold soak overnight. Next day leak was gone. Went for drive and no smoke. Mind you this was just day one, but given the severity of the leak, this looks promising. Still not sure why it worked on the second can and not the first. I lost a lot of coolant when I pulled the heads, but it is possible enough residue of the first can of K Seal remained. My current thinking is that the problem may be a crack in the intake manifold and not the block. This is because the engine did not blow coolant before I changed the intake manifold gaskets a few weeks prior just as routine maintenance. The manifold EGR passage was totally clogged with carbon which I removed. It is possible this carbon may have sealed the crack in the manifold. Chevy manifolds have massive exhaust and coolant passages that run parallel to each other and a defective EGR system could generate excessive heat that cracks the manifold internally. This would allow coolant to get into the exhaust.