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If you use ULTIMATE for a Head Gasket repair and it and it fails to fix the leak get in touch to find out about our money back guarantee. For all our other brands if you have a repair that subsequently fails contact us for a replacement bottle.
Reviews 493
andrew sullivan
Jun 04,2023Bmw 318i 2002 coolant leak on top of radiator 2 bottles of k later still got a leak any ideas what went wrong ok radiator changed got no heater now cos its blovked up with kseal so another shedload of money got to be spent ridiculous
Chris
Jun 02,2023It seemed to work last night, followed directions, let it idle for a long time, let it cool down and then drove around town and a little on the highway it was great! Today though it started to over heat again..do I need a second bottle? 2009 VW Routan Mini Van. I had a mechanic tell me it was the head gasket but there's no coolant in the oil and I don't see any leaks.
Billy Booher
May 12,2023Bad brakes after mechanic kept it in his shop over 2 weeks
David Hawkins
May 07,2023K-seal OMG š³ Audi TT coolant light came on, topped up coolant, and coolant came gushing out from underneath, after reading reviews about K-seal, i thought Iāll have a go, i purchased K-seal from euro parts for Ā£10. Followed the easy instructions, turned on the engine to let k-seal run through, no leaks, topped up with coolant, no leaks, coolant light off, instruments on dash back to normal, engine fine, car running lovely, and back to normal, k-seal saved me lots of money and time, k-seal really worked āļøāļøāļøāļøāļø
Marian Puddick
Apr 23,2023We have a Fiat Ducato motorhome and the day before we were due to go away the radiator started to leak, losing nearly a litre of coolant in 10 mile. Iāve never been impressed with radiator sealants they never seem to last long but paid over Ā£20 for the 479ml as it was the only option at the time and I am really impressed with it the leak stopped within a few minutes and Iāve done about 500 miles and itās still not leaking, I was going to order a new radiator on our return but I think Iām going to wait and hopefully itāll live up to its claim of being a permanent repair.
Cees Q
Apr 12,2023The Chevrolet Trans Sport, amazing car by the way, had a new gasket 40k km ago. But after the 40k km I had the same problem again. Several times the temp became to high and there was a lot of air in the cooling system. Also there was a little bit of white smoke of the exhaust pipe and sometimes I had a bad start. I've used Kseal. Directly in the radiator. It's a wonder. Problem solved after a few minutes. The white smoke has gone, the temp is very constant and the engine runs as new The Kseal should be permanent they say. I hope so.
Stephen Minister
Apr 11,2023A total waste of Ā£13.99 and an hour out of my life wasted. The guy in the shop was raving about k-seal and how great it was but it's total rubbish. I shook and shook and shook the container and I applked it as per the instructions and has done absolutely nothing. My car is now booked into the garage to get flushed out and the leak repaired properly. It's no better than snake oil, don't waste your money!
Johnny Campbell
Apr 03,2023We just got back from a holiday in Oz. Jumped in the car to come home and after about 5 miles the heater wasn't getting warm. Pulled into a supermarket and saw the coolant level was almost empty. Weird as it was full when we left home 3 weeks ago. Filled with coolant, heater warmed up and off we went. Lo and behold 5 miles down the road and heated went cold. Pulled off the motorway onto a side road and saw the coolant was almost empty and leaking onto the road. Called out the AA who came out. Saw the leak, said it looked quite small likely a stone chip. We then shot of to euro parts and bought some K seal and the AA man applied it stayed with the car and us for a good 40 mins to make sure it was fixed and lo and behold again lol, it's sorted. Absolutely amazing stuff. He also said in the unlikely even it will leak K seal could fix that leak for the rest of the engines life. So if that's the recommendation of an AA driver I'm more than happy. Thanks very much K seal great job. Thanks
Tracey Jayne Boulton
Mar 25,2023Donāt do it!!!! Put this garbage in my Fiat 500 because I had a slight coolant leak. Blocked up my heater matrix leaving me with a Ā£400 bill.
Paul
Mar 22,2023Well I just put this product in my Civic Si(cracked block) and it has stopped using coolant(reservoir every 200 miles, 300,000 on the odometer). Amazing, I've kept the RPM's down but seriously the coolant loss has stopped, heater still works and no overheating. I wouldn't have believed it but I can only hope it's long term-Thanks K-Seal!
Kevin Barber
Mar 17,2023I havenāt used it (yet), Iāve read the reviews both positive and negative; but how can I be sure it wonāt cause damage to my Jeep Wrangler Sahara 2.8 Diesel? Iām unable to visually see where the coolant leak is originating from.
Ceri Boreham
Mar 10,2023This stuff is the real deal. And Iāve been let down before by āstop leakā products. I was nervous to try it as i had already replaced my entire radiator from a previous failed product that blocked my system up and blew the top tank on my radiator, but i still had a blown head gasket that i could not afford to replace. I emailed Colin to try put my mind at ease and he was very honest in his advice. I went ahead and added the k-seal to my system and i still canāt believe it, but it worked. Itās been in my car for 6 days now and it hasnāt used a single drop of coolant whereas before i was having to top it up daily. This has saved me a lot of money and a massive headache. Donāt bother with any other product, just go straight for k-seal. I should have to begin with. Once again, thank you Colin, and the k-seal team!
Barry
Mar 08,2023My impala started a slow drip and over a couple of days became a faster drip. It appeared to be coming from the radiator. Stopped by the auto parts store and picked up a bottle of K Seal. Poured into overflow and when I got back to work, the leak had stopped. Worth every penny.
CScotty
Feb 19,2023Stunned. Saved my car from the scrap heap. Recommended.
Fredy Ferullo
Feb 18,2023Worst product ever they say it doesn't do any damage it's bs it ruined my brand new radiator I replaces few months ago. My mechanic said this stuff ruins your radiator good luck
S.Thornton
Feb 11,2023Absolute brilliant, definitely deserves a 5 star review, works well with my 2006 ford fiesta Ghia 1.6. no issues, no more leaks.
Robert Cook
Feb 06,2023Do not buy this ever. It will coagulate and ruin your engine. I put this in my coolant overflow reserve to stop a slow leak, I was going through a gallon of antifreeze about every month. Now the coagulated chunks are getting stuck in my smaller passages and causing it to blow coolant out of the bottom radiator hose. I am now going though a gallon of coolant a week. Even after replacing the thermostat, the water pump, and the return coolant hose as well as thoroughly the flushing the system several times now I still have pea sized chunks of kseal in my system. If anyone knows a way to get this stuff out without it costing thousands of dollars, let me know.
James Wilson
Feb 06,2023Excellent product. Fixed the "weezing" sound coming from the heater core inside the car. Always amazed at products like this which save a trip to the repair shop.
Dave Smith
Feb 05,2023I have a 2006 Volkswagen beetle three bottles put in it didn't seal my water pump now my car stuck on the side of the highway hi Steve well I put three bottles in and it says guaranteed it would work on the water pump guaranteed and that you guys would replace the bottles but from what I'm seeing you're not replacing nothing so putting three bottles in didn't seal it then that stuff is not guaranteed like you guys say on the bottle you're right they never did but it says right on your bottles guaranteed to work or we will replace your bottles well you don't live up to your word cuz it says it right on the bottle replace if doesn't work and now you're not going to replace or give my money back because it says it on the bottle itself okay I will be posting this on other sites about the case Hill and not their guarantee because it is not guaranteed to work and it is not guaranteed that you guys are going to replace the bottles okay so how do I communicate with them and you have yet produced anything to communicate with them the website know nothing have you gave me
Erin G.
Jun 10,2023This product was $29.99 and saved my engine from thousands of dollars in repairs. I was so sure my cracked head gasket was going to fail that I began to look for a new car. This product completely sealed it, and now my heat gauge never exceeds 40%, even driving hundreds of miles on hot days. I would definitely recommend. Even if you're crack is too big to be fixed, it's worth the $30 gamble.