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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
Faiz Azim
Sep 27,2024Granted I knew something was wrong with my vehicle as I was refilling coolant every few days and getting along. I used Kseal and the problem went from bad to worse, radiator fluids started draining instantly. I was coping just fine before. Will never use any products of the shelf again without proper advice from a professional.
Ronald Livingston
Sep 26,2024Wow just wow it works !
charles wang
Sep 25,2024I have a 2012 bmw x5. it becomes a nightmare since I started doing repair/service at BMW Tenafly about 3 years ago. For the three years, I have spent over $15000 to deal with engine oil leakage, water pump, check engine light etc. My experience with BMW Tenafly service is horrible - wish to alert friends in North Jersey to avoid going there fore service. To make the story short, I noticed slow coolant leakage after BMW Tenafly changed my water pump end of July. I had to add 1 gallon coolant every other week. By web surfing, I noticed K-Seal and tried in the morning of 9/19th. I haven't found any leakage from that moment on. I know it may be too short to jump into a conclusion. But I am really really happy so far on the result.
David Clark
Sep 24,2024Bought a bottle to repair radiator leak, didn't work, so foolishly bought a second bottle and still failed to work. £36 that I could have put towards the new radiator that I had to buy.
Mudassar Iftikhar
Sep 20,2024Bought k seal for heater matrix repair.it only worked for 2 months and now it leaking again. Wasted £16. With my experience I Don't recommend k seal.
Customer Roger Armstrong
Sep 20,2024I had a serious coolant leak into one cylinder of my 100 year old 2 stroke engined Trojan car. The cylinder was sealed using an aluminium plug and a chemical reaction back in 1924. Replacement engines or spares for the car no longer available so I was faced with a strip down of half the car, removal of engine for a serious and expensive engineering job that may or may not work, or trying K seal. I followed the instructions on the bottle, there was lots of steam and escaping water but K seal has stopped the leak, sealed the engine and restored the car to use. Many thanks.
Mohammad Zobier
Sep 12,2024The k seal nit working on hilux 2011
Rob Ramsay
Sep 03,2024I had a serous water leak between the engine and the body and the garage told me it would take two to three days to access and repair it. I was in Edinburgh and had to get a ferry the next day to go home to Dublin. I found K-Seal on line and although I didn’t believe anything could work as well as was claimed, I had no option but to give it a try. I bought two bottles, put one in and followed the instructions. All I can say is that it did exactly what it said on the bottle!! It sealed the leak and I encountered no problems on my journey home. I cannot speak highly enough about this product. Many thanks
Kim D
Sep 03,2024DO NOT BUY- BLOCKED THE COOLANT PIPE, could have killed the engine! Bought to stop a leak in the radiator which it did, however it blocked the coolant pipe coming from the expansion tank! Had to wait several hours for recovery into the early hours on my own, arrived home at 3.30am. Lost two days work and received a garage bill! DO NOT BUY, as it does more damage than good resulting in significant consequential losses!
Ken McComb
Aug 31,2024well I can't believe it I found something in a bottle that says it repairs something and it actually does I put it in a 2002 Dodge Grand caravan with a head gasket leak my tailpipe was spitting water put this in when back waited looked at my tailpipe wasn't expecting it to work all sudden the white smoke stop coming on my tailpipe no water checked it it's been 6 months no leaks can't believe it absolutely amazing give it a shot only cause you're 30 bucks what have you got to lose over $2,000 head gasket repair my car has over 215,000 miles on it also great product very happy able to keep my van a little bit longer
Joseph
Aug 30,2024I just try it on my water pump work good so far it stop the leak hopefully it last long till I can save up to fix it! on my 2006 pt cruiser.
D Michaels
Aug 19,2024My used 2013 Dodge Journey has slowly leaked radiator fluid for some time. One day while driving to work the radiator gave out. I had a new radiator installed, figuring this would take care of the leak. When I saw that fluid was still leaking, and my check engine light came on, I took the vehicle to a local garage for a diagnostic, along with a scheduled oil change. I was informed that radiator fluid was leaking into cylinders 2 and 4 (this is a 6 cylinder vehicle). I have the estimate in my hand as I type this, so this estimate is in no way embellished. They want $5,163.42 to fix this problem. Since that is about what I paid for the vehicle, I told the mechanic I will just drive the vehicle until it dies. When I got home, I looked online to see if there are any products available that may extend the life of my vehicle. To my surprise, there are products that can seal small leaks like the one I have. I decided to go with K-Seal, based on the reviews compared to other sealers. I bought my $15 bottle, poured it into the reservoir tank, and took it out for a drive. This was back in June. I am due for an oil change in 400 miles, so I have driven close to 2,600 miles, and not one drop of antifreeze has leaked. My check engine light has also disappeared. I can't thank K-Seal enough for saving me over $5,000 in auto repairs.
Midlife Crisis
Aug 14,2024Called K-Seal first to discuss the symptoms and nature of a cracked head pushing exhaust gasses out and the confirmed this product would help as it was not the coolant leaking out within the engine. They could have just sold to me regardless but instead took the time to discuss the problem and the solution forward 10/10 for honesty and professionalism
Dwayne
Aug 05,2024I have a 2009 BMW X5 3.0 and it initially worked for two weeks. I was sitting in the parking lot of the supermarket and I noticed the engine bay smoking! I bought two bottles of coolant and another k seal. No go this time. I have to get it towed 🤬
adithya Nanu
Jul 28,2024Be careful with this product initially it will work. But slowly this makes your car vulnerable. This product blown my head gasket for Ford fiesta and I end up with huge loss fixing the head gasket it’s costing me now 800£ to replace head gasket.
Consumer
Jun 25,2024I was really hopeful that this would work I have a small head gasket leak and with the reviews I was seeing I knew it would work but to my disappointment it wasn’t helpful for me. I’m sure in some cases it might work great as per the other reviews but for me unfortunately it just didn’t happen.
Max
Jun 14,2024Had a gasket leak on the sprinter popped a bottle in her and BOOM 4 minutes completely sealed then drove 380 miles and not lost a drop - well impressive
John Wilkinson
May 15,2024I have a coolant leak somewhere on my insignia I think it's c9ming from a pipe or radiator would k seal solve the problem?
B Gers
May 12,2024Dit spul doet gewoon waar het voor bedoeld is. Opel station uit 2009 begint opeens veel koelvloeistof te gebruiken. Ik was echt sceptisch maar zat niet op een 500-1000 euro koppakking/radiator reparatie te wachten. 1,5 flesje erin gedaan en gewoon werkelijk geen lekkages meer (vloeistof al maanden op peil weer). Lekkages waren niet visueel dus ik vermoed een koppakking...
Ruud de G
Oct 11,2024K-seal voor koelsysteem gekocht omdat er ergens een kleine lek zat in het koelsysteem. Nu 1 week later koppakking eruit en motor loopt heet, borrelen in koelvloeistof reservoir.