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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 Ohm
May 30,2020Used k-seal and initially after a few minutes the smoke from the tailpipe was drastically reduced but still have some smoke. I let the car idle for about 30 minutes and shut it down. I I am going to run the car again tomorrow morning and see if it improves because I read where you may need more than one heat cold cycle. I will keep you posted.
Scott Chapman
May 26,2020Having found a TrustPilot review about K-Seal and what looked like a helpful reply on the post, I sent an email to the address listed in the post, in the hope of a reply with a little guidance on an issue with a coolant leak. I was amazed to have received a reply straight back, on a Sunday! The emails from Colin were extremely helpful and knowledgable and has offered to send me a product to help! Amazing service.
Dave Leonard
May 25,2020Found a great deal on a 2008 Pontiac Torrent 3.4 in wonderful shape, sans a head gasket leak leading to overheating issues. Bought the car, put the product in, ran at an idle for 20 minutes and let it sit overnight. Took care of the problems with the white exhaust and no more overheating or coolant loss. My only question is, how long might this treatment last? This stuff really appears to work as specified. I urge users to follow instructions and have a clean rust free system. So far, I am a believer in this product!
Don Burleson
May 23,2020Sir, applied K-Seal to my 01' 7.3 radiator. The leak was coming from the water pump seal. Warmed up the motor, added K-Seal and just minutes later no more leak. AMAZING... Great invention. Thank you. Don Burleson.
Jack Barrass
May 17,2020Just purchased your K seal Ultimate, suspected head gasket failure, not loosing much coolant, tiny little bit of oil in the header tank, blue/white smoke under load when boosting, small ploom of white smoke on start up and a real rough idle. Any Tips/Trick to make sure the possess goes smooth? Thanks in advance
dave krohl
May 09,2020Do not use this product, it will clog your heater core leaving you with little to no heat. The company says to do a back flush to fix the problem so I went from a small issue to more car repairs. Stay away from this stuff.
Glenn williams
May 07,2020Excellent customer service in processing the guarantee would recommend using K Seal as if it works you save on expensive repair and if not you get a full refund.
King Wade
Apr 23,2020My 2009 dodge charger had a bad leak this product stopped the leak completely wow saved me 900$
David Taylor
Apr 22,2020Amazing product, called at a garage this which happened to be opened despite cov 19 lock down. Advised to try this Kseal instead of expensive water pump replacement. It's worked a treat stopped the leak straight away. What an amazing product thanks Kseal šššš
john john
Apr 05,2020Called the garage where I'd bought car from a few weeks ago, VW Polo mk 4, 9n 1.2L 2002 reg...107000 miles on the clock. I told them, every time I drive 20 miles or so, the water has dropped well below the minimum mark. No sign of leakage from hoses, no drips, no water contamination in oil. They said, put K- seal in . I asked, will this work? They said, if you brought it into us, this is what we would do. I did this, seemed ok , now I've checked level again after driving a few more miles, and water down again below minimum. When garage reopens after crisis, will have to see what they think or can do. But sadly doesn't seem to be working for me, on what appears a relatively minor leak.
Lee Leftwich
Mar 27,2020I used the K Seal in my 2006 Civic after been told by Honda Service that I had a crack block and would cost $15,000 to repair. The engine had 178,000 miles. After talking to other mechanic they was not feeling that it was a crack block. I researched for other means of fixing the block and I pick K Seal. I must say that I am 100% satisfied with your product. As of today, I have over 2,000 miles more on my engine since using K Seal. I highly recommend your product and have told other people how it has worked for me.
Aylwin Chin
Mar 16,2020I had a blown head gasket on my W211 E-Class. My car was losing coolant to the tune of approximately 2 litres per every 10 kilometres which is one way on my daily commute. Ordered a bottle of K-Seal, followed the instructions and voila, an immediate fix. Waiting to see if the results will hold but I am extremely pleased with the results.Thank you K-Seal!
Collin Anderson
Mar 13,2020Had a good size drip coming from my brand new radiator, I was upset. I put in a bottle of K-Seal dripping stopped within about 15 minutes. All dry now and I'm back on the road!!! Thank you K-Seal for such a great product. I highly recommend it to all.
john howard
Mar 11,2020Just want say a big thank u to colin from k-seal for ur help it worked second time round thank u.
Mihail Celan
Mar 10,2020Did not repair the head gasket on my Toyota RAV4, just a waste of money as I had also to change my coolant after using K Seal. Apparently, K Seal cannot repair a blown head gasket if there is back-pressure.
Norman Abram
Mar 10,2020Saved me a fortune dont need head gasket changing no more K seal has done the job happy fella šš
customer
Mar 09,2020Fixed coolant leaking from head gasket on my BMW E46 3 series 2004. Poured in 1 little bottle and leak stopped after the engine warmed up ! WOW - useful and surprisingly effective.
M.L
Mar 07,2020Iām now facing a major engine rebuild after using this rubbish. Blocked the radiator and had to replace with a brand new one and blocked the coolant lines leading to significant overheating which screwed the head gasket. Beware Iām now into Ā£1,000 of repairs which is ironically the cost of fixing the head gasket in the first place which I should have just done so the whole exercise has been a vast waste of time and money to end up having the engine rebuilt anyway. Donāt believe the hype. Just have the work done properly as thatās what youāll end up doing anyway. Edited to add: I will be contacting you āColinā with a full engineers report and a lawyers letter accompanying a claim for Ā£1500 damage caused. I note you donāt provide your email address as I have tried contracting your company without getting a reply. You donāt seem to like people asking for compensation over and above the paltry Ā£30 you āguaranteeā to give people back if your product doesnāt work. But hopefully at least people will read this review and not end up with the damage your product caused to my car as they wonāt buy your product in the first place. As I said your product totally blocked the radiator and cooling system on my car causing extensive overheating and damage. PS: there is no email given at the top of this page and you didnāt offer it up either. Just further evasive practices from a company that sells goods that can cause significant damage to expensive machinery.
Jeffrey Dixon
Mar 06,2020K-seal really does work, this stuff is very good, it sealed my leaks , really quick to, I'm not leaking antifreeze anymore, I definitely recommend k-seal,
Mick J
Jun 11,2020I have a 1997 VW GOLF 2.0 GTI with 160,000+ miles on the clock that has been parked up for a few years. I start the engine monthly to keep it running etc but noticed the water light flashing each time I did which needed a little water adding. I'm no mechanic but noticed a rusty water area on the front of my radiator so assumed it had it had a leak. I drained the system as it needed doing then flushed it with a radiator flush (the water was more orange after the flush) then added a bottle of miracle K-SEAL!! which INSTANTLY stopped the leak!! I've started it and got it up to temp with heater on full at least 15 times since with no problems. My car also seems to run better since day 1 of adding miracle K-SEAL so may have helped with other problems I didn't know about yet like maybe head gasket etc? I will always have a bottle in stock now. Also I've been wondering how many garages have taken a vehicle in to do a "big job" for someone and have just poured poured bottle of miracle K-SEAL in and billed them for head gasket work etc??? 100% happy customer from the UK