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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
Jon D
Oct 03,2023BMW 330 iperformance hybrid. Mecanic told me to put 2 small bottles of K seal as coolant was leaking..It worked initially l,leaked stopped,but in few weeks leaked again.Addes 1 more bottle of K Seal,its not leaking anymore but now my car will not give air con and heat,and we approaching cold weather in Uk,Went Bmw,went other mechanics,everything seems to complicated,Bmw said is better to get rid of the car cause they said it will cost me probably more money repairing the car,other mechanics simply have no clue what to tell me,either radiator,either battery or other things,no one knows what this car have..Please help!
Trung
Sep 26,2023Hi. K-seal worked well with my Subaru car a month ago, which had a head gasket leak before. Would my car now be safe to drive for a long distance about 200 miles? Please give your advice.
Peter Brown
Sep 10,2023I had a small leak on top of my car manafolds near the injectors.I ussually don't beliave on these products, but this product does exactly what it says it does. In less than 30 seconds the product started to work the leak stop the engine started to work better I still can't belive that such a small bottle can do so much. I really thought that it wouldn't work, but the product started working rightway.
john manos
Aug 27,2023K seal is for real... Had a leak undercarriage and tried another cheaper product first... NO HELP!!.. ready to give up and about to take my Benz in for service and tried K seal and Boom... No more leak ... Im a believer in K seal
Paul Neve
Aug 26,2023I bought K seal for my van which was losing water couldn’t believe it so far so good 2 weeks in hasn’t a drop I think the key is to read the instructions carefully do a decent run in your vehicle and it should cure it
Graham
Aug 25,2023Brilliant product, does what it says it does, I needed to contact K Seal,I got the best customer service I have come across in years. It may seem more expensive than others ,but this works where cheaper ones in tried didn't. Big Thanks.
R MCMAHON
Aug 19,2023I was losing water. The garage fitted a new radiator but this made it worse. There was a bit too much pressure in the cooling system and the header tank wasn't working. Garage said it's a cracked head or headgasket. £4,000 repair and three weeks at least off the road. My other option was to buy a new vehicle £38,000. My vehicle is a taxi and is my livelihood. I used KSeal head gasket repair and it worked. All pressures are good and zero loss of coolant. I can't thank you enough, best £32.50 I've ever spent. I think there was a crack between the water jacket and the exhaust. Hyundai i800 2.5 diesel. Thank you 😊
James McMullan
Aug 14,2023I will update this on if the product worked seeing I just added it a couple days ago. I just want to commend how incredible the customer service is for this company. Usually with big companies you don't get quick responses or helpful responses. K-Seal exceeded every expectation I have. They were quick to respond, helpful, and gave great advice. I really hope this product works so I can give the full 5-stars
Mr ALAN
Aug 11,2023Used it in a 325i bmw. I followed the instructions to the letter and no more leak. I went out for a ride on my motorbike and came across a road with newly laid chippings. One of which punctured the vulnerable radiator. I used k seal and again the leak is plugged. 2 vehicles, 2 100% successes. I think the secret is to FOLLOW THE INSTRUCTIONS !
Mrs Julie Elliott
Aug 03,2023I have a Mercedes clk with a heater matrix problem purchased a bottle to put in was extremely thick to pour ? Does not seem to have worked
cindy massey
Aug 01,2023I BOUGHT THIS FOR MY FORS TRUCK WITH A SIMPLE HEAD GASKET LEAK, IVE GONE THRU 2 BOTTLES AND STILL DOING THE EACT SAME THING...I PUT MY TRUST INTO A FAULTY PRODUCT..IVE BEEN OUT OF WORK FOR ALMOST 2 WEEKS BECAUSE THESE FLAT OUT LIED ABOUT THEIR JUNK, DONT TRUST THESE PEOPLE....DO NOT...I REPEAT DO NOT BUY THIS AND EXPECT IT TO WORK FOR YOU BECAUSE IT DONT...THEYRE LIARS!!!!!
Josh Watts
Jul 26,2023Does this seal a head gasket my car is a 2010 insignia 2.0 eco flex I’ve replaced my clutch gearbox oil cooler and now apparently the head gasket is no good starts but after 10 miniutes of driving the gauge gradually does to max and the fans kick in can anyone point me in the right direction please?
customer
Jul 14,2023My 2005 Jaguar XK 8 had a cracked thermostat housing and quite a healthy leak. Given it's a discounted part and not one available anywhere on the globe, I tried K-Seal. It has work perfectly. Thank you!!
Thomas DeLise
Jun 27,2023Well I did everything as per instructions and nothing has changed. Have a 2016 Honda city. Exhaust gases over pressurizing system and over heating. I back flushed the entire system until completely clean. I added 8 oz. To upper hose right into engine, filled with proper blue coolant and ran the car. No bubbles until fan kicked on. I installed my large over flow funnel at top of radiatior on an incline and the result was violent bubbling throwing coolant everywhere. Took funnel out and let engine cool. Tried again with cap on but still same issue. Hoses are rock hard and bubbling into reservoir. It was my last hope as in the country I'm in engine changes take 6 mo's with re registration process and the installation then more and the registering so my vehicle is basically totaled for only blown head . Worth a try.
Derek Easterbrook
Jun 23,2023Had a coolant leak on a 12 plate focus 1.0 ecoboost. Couldn't see any split pipes and also saw traces of coolant in the oil so guessed it must be head gasket or cracked cylinder head. It got to the stage where the car struggled to start because of coolant build up in the head. Bought k-seal but was a bit apprehensive to whether it would do more damage. I had nothing to lose and was amazed with the results. No more coolant disappearing and after changing the spark plugs it starts straight away every time. Will recommend to other car owners with similar problem 👍
R. L. Steely
Jun 22,2023Don't waste your money on this garbage. If you want a refund good luck jumping through these hoops when your vehicle is sitting 200 miles from home. This product is garbage
Rod
Jun 19,2023Bought this around 2 months ago for a radiator leak. Followed instructions and stopped the leak but has now started leaking again. Thought it was supposed to keep working to stop any new leaks once it was in the system.
kaf
Jun 13,2023Wow this actually works, Took my my ford focus to numerous garages for a coolant leak , they kept saying change thermostat housing done that and it was still leaking. Another garage said change all the coolant pipes. In then end i figured it out it was block that had a slight crack and was leaking coolant. This would have been an expensive fix. I come across K-seal recommended by a friend and its solved my issue no leaks and heating ac every thing is working how it should. Absolutely brilliant for for for £14.00 . Thank you K-seal!!
RSG RSG
Jun 12,2023I used this product on a 1988 ramcharger. Noticed the coolant level going down and I could smell antifreeze. This fixed it. Been 3 years. Date didn't go back that far
Anthony
Oct 07,2023Contacted them several times they never sent me form to fill out for my purchase. For refund was lied to and ignored my head gaskets are blown. They didn’t refund my purchase