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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
MB
Aug 18,2020Having had a Vauxhall Corsa (Old 1997?) that had been using coolant for a while I finally decided to do somethiong about it. It was definately the head gasket that was the problem but luckily it wasn't over pressurising. I decided to give K-Seal a go as it had been recommended to me by a friend. Before purchasing I rang K-Seal and spoke with Colin who was very helpful and gave me advice on the best way to use the product but did warn me that Vauxhalls were sometimes a problem and that K-seal might not work. He very kindly offered a full refund if K-Seal didn't work for me. I purchased K-Seal Ultimate as I wanted the best chance of it working and also some new coolant (although this isn't strictly neccessary as it will work with any type of coolant in the system but if it did fix it at least it would have new coolant!). I drained the system right down and then refilled with K-Seal into the header tank and then coolant afterwards to flush it into the system. The engine was run up to full operating temperature until the cooling fan cut in and then allowed to cool; I did this a couple of times. I wasn't entirely sure if the fix had worked and on inspection noticed that quite a bit of the K-Seal was still in the header tank. I drained some of the system down and then used it to flush the K-Seal back in from the header tank so I knew all the product was in the engine (Very important). I ran it up a couple of times more and then took it for a drive, about 40 miles. On returning it didn't seem to have used any coolant so it looked as if it had worked. I needed to do a long journey so decided to risk using the car. After a 220 mile run to London I checked to coolant and not a drop had been used!!! I have since used the car on a regular basis without it using any more coolant. Many thanks to Colin & K-Seal.
Andrew Swindells
Aug 11,2020Had coolant leaking from somewhere near the water pump on my Toyota previa d4d I was told to try some k seal .purchased some and with a warm up to operating temp engine poured the bottle in .the coolant was v low .but then water /coolant started heavely dripping from under the car I left it running 7 mins as the instructions suggested to get up to operating temp the engine was at this anyway .but no luck just lots of coolant pouring out I'm guessing water pump has gone !! Oh well next ...it seems the Bearing had gone so K seal wouldn't really have fixed it .Worth a try tho .
Nicola P Morbelli
Aug 09,2020I used k seal previously on a 1999 miata that was smoking white vapor. Worked great! Today I used it on a 2015 Fiat Abarth with the same issue and so far the car is still smoking. It Seems a little less then before but the misfiring code is still press. I used 4oz to start with and added the remaining 4 a few hours later. I'll check again in the morning. Hopefully a hot cold cycle will help. Colin, I tried to send you an email and got email error. Please check your email address!
Rob Clarke
Jul 29,2020This is amazing stuff. Saved me almost a thousand pound on my vauxhall corsa which had a leaky coolant problem caused by cracks or holes in my head gasket and water pump. Kseal saved my vauxhall corsa from going to the scrapyard or sold for parts. I couldn't be happier :-)
Munir Butt
Jul 27,2020I put k seal in Mercedes Sprinter van 311 cdi unfortunately after driving just 20 miles the system had great pressure and I lost all my water coolant . K seal made it worse as I was only loosing some water now I am loosing all. I been advised to put another bottle in the water system to see if it can stop the leak. ... Is it a good idea to buy another K seal bottle or is it going to make it worse. My Mechinic think there is a leak in head gasket.
Consumer
Jul 25,2020Final Update on corsa 1,2 Took car for long drive on motorway for over 1 hour @ 60 mph, then used daily since fix, the temps are steady and car runs great, so just a final thank you to colin for the free bottle that fixed the issue but more so for the vast knowledge he has and outstanding customer service, I will leave with a final note to anybody attempting to use K Seal, If you are unsure how to go about with the problem you have, See this guy before you try a fix, such an honest,clever,caring person I have ever met in the motor trade. Trustpilot and certainly Trust colin, outstanding stay safe take care, dave..
KC
Jul 24,2020If you have a vehicle water leak problem the first person I recommend would be to call/email Colin at K Seal. His depth of knowledge on possible vehicle water leaks on all types of engines is second to none. I dropped him an email last Sunday 19th July to say my Mitsubishi L200 had lost some water. It had previously had a water leak from the radiator late last year which I had successfully sealed with K Seal in about ten mins from pouring the product into the water system and it not leaking anymore. Since the Covid 19 lock-down I had not used the truck for several weeks. Colin very quickly responded to my email and indicated a couple of possible issues. The first; because the vehicle had stood for some time "a leak along a seam of join is more prone to cold-heat expansion and contraction and can break a previous repair". This was exactly what the issue was. Colin also very kindly offered me another K Seal (at no charge) which he dispatched overnight to my house. Please understand that I did not ask for this but more importantly he just offered it to me. This is called great Customer service. I cannot highly recommend Colin and of course K Seal enough for their attention to brand and passion about helping us, his customers. Highly recommended for their product and their Customer service.
Charles Custer
Jul 21,2020I have a Toyota Prius 2013, I started to notice engine knocking, foul smell loose of coolant and getting codes PO302,304. Mechanic diagnosed bad head gasket and to fix $1,700 or rebuild engine for $2,700. And after a lot of reading about head gasket sealer I decided to go for it with k-seal because I caught it early I suspect it was a small fix. I got the k-seal for about $13.00 I pour like 3/4 of the bottle in my engine coolant overflow container . Run car for 15 minutes droved it for about 15 minutes. Next day stared smoothly no knocking no smell but I was still getting a code PO304 I went to work and drove 30miles in my lunch break decided to let the engine iddle again for 20 minutes , drove it back home with no problems at home check for codes and NO CODES!!. Next day went did and oil change and a coolant flush to get the remaining product out of the system. Thanks so very much k-seal so far it fixed my car it has been 4 days and car runs great excellent MPG, super cold air conditioning. I took a chance and I saved thousands of$$$$. Hopefully I can help someone out there with the same situation. 👍👌💃
Colleen Engle
Jul 21,2020I honestly think it would have worked had I used my head and checked hoses first. Id request a new bottle but it was my fault not the product
Sharon Purnell
Jul 16,2020It's a great product, what a fabulous thing for people to save money, it fixed my leak on my water pump casing....until I drove the car then it started leaking all over again. I don't understand why, perhaps the leak is to big for the product guess I'm just gonna have to pay to get it repaired :(
Lisa LLoyd
Jul 16,2020Bought k seal about 6-7 months ago. Has worked quite well. But now leaking again.
Jim Speakman
Jul 11,2020This product is amazing! I have a 2003 Dodge Ram 1500 with cracks in the radiator and couldn't afford to repair it. So i found this product which is affordable and I figured why not! I poured it in and drove around immediately and my truck is running like a champ! Thank you K Seal!
Cozzyman
Jun 26,2020Bought this product on recommendations to fix a leak in either cylinder head or engine block. K-Seal has not fixed the problem which is a leak on the exhaust side of the motor. The cooling water is pressurised, there is no water in the engine oil. K-Seal supposed to fix this problem...... It didn't
Evan Turney
Jun 25,2020This product is amazing! It literally saved me close to a grand. I highly recommend it!
David Rillera
Jun 25,2020My 2004 Mitsubishi Endeavor with over 202,000 miles. Recently overheated, with little water out the exhaust. Mechanic said possible gasket but not worth the repair, better to get a new engine I purchased KSeal, antifreeze and distilled water. Since using KSeal haven't seen a drop of anything, gauge stays in the middle as normal. Working so far, am Happy. 7/18 after driving over 20 miles the leak is back, looking to apply 2nd bottle, any thoughts?
J
Jun 22,2020I hav an 07 grand prix.w/ the 3800 engine. I had a really bad coolant leak running down the block behind the water pump. I put k-seal in and c 1 min 10 sec. Later it stopped leaking !! That was only yesterday but so far no leaking at all..
BįñAhmèđ Ķhàłěđ
Jun 21,2020I don't even write comments or reviews but had to as it saved me 300 AUD... used it in my hyundai getz and worked like a magic it's been 3 days my radiator is still full... Let's see how long it will last even if it last for 3 4 months that's worth it i guess but hoping it will fix it permanently...
Tabatha
Jun 16,2020We used kseal 2 weeks ago and it worked wonders. We have had a few freeze plugs rust out, and have replaced the ones we can get to. We also had a leak somewhere else that the kseal fixed, but now a different freeze plug is leaking, and it isnt in an area we can get to ourselves to change out. My question, is it ok to put a second bottle in our 2000 Mazda protege? We are getting a second vehicle this weekend, but I dont want to mess anything up and not have a way to and from work between now and then. Is a 2nd bottle safe?
Bill Mankoo
Jun 11,2020With the help of K seal and with their wonderful staff’s advice, I have saved a small fortune.Thanks. P.S. I am ever so great full to Mr.C.Benzie. Thanks again.
Μινος Μινος
Aug 22,2020I got both K-SEAL products because I have an inflated gasket, and they did nothing. They clogged my fridge. I just wasted money. DO NOT TAKE IT.