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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
Gene Leffingwell
Jan 26,2022I have used a lot of stuff through the years to stop a heater core leak most of you no what I mean. So my coolant was streaming into the cab on the passenger side ,I put in k seal drove home 8 miles leak has stopped
Jeffro
Jan 25,20221998 Monte Carlo 160K miles. One year ago replaced the leaking intake manifold gaskets and all was good until last week. Car started leaking again, but this time it appears to be head gasket. Not wanting to take the engine apart again to do that head gasket, and re-do what I did just last year, I decided to try K-Seal. Well... it stopped the leak in about ten minutes! And it has been leak free for the past week or so. Hopefully, this IS a permanent repair! Thanks K-Seal, you saved me some work! (and $$$)
Mr & Mrs Mcclinton
Jan 23,2022Hi had a small leak from heater matrix put in the k seal as per instructions got engine up to temp great leak stopped but I’ve noticed my van has been sitting for a couple of days and a small leak has appeared is this normal when engine is cold hoping when I run it back up to temp it stops certainly not as bad as it was
Grant Stuart
Jan 14,2022used it twice did NOT work as promised . fail.
jax
Jan 08,2022I have an jaguar xj6, 1977. I had a problem in head gasket. I used K-seal 4 weeks ago. It's work fantastic and made me proud.
Duane Hogge
Jan 03,2022I have a 1992 lexus es 300 with about 193000 miles I was driving home one evening when I noticed my temperature gauge heading toward the top of the range. I pulled off the road and shut the engine off. I could hear the coolant boiling in the overflow tank. I let the car cool down and refilled the radiator. I took the car for a short drive and noticed white smoke coming out of the tailpipe and the temp gauge going high again. I knew the head gasket was blown. I stopped at my local Auto Zone and picked up a bottle of K seal. I figured I should at least try it before I gave up on my car. I put the bottle in my cold radiator the next day and ran the car for about 10 minutes. The smoke was still there but much less and the temp was staying in the normal range when it was running. I shut off the car and left it over night. The next morning I got it the car and started it and let it run another 10 minutes or so, This time no smoke and running cool no more boiling etc. I am very impressed with the results from K Seal. I have put on another 500 miles on the car and smooth sailing! Thank you K Seal I am a believer!
Robin Davis
Dec 20,2021Last summer I had a head gasket problem on my 2005 dodge grand caravan.It wasn't at the point of having coolent in my oil.or running roughly.But it was smoking some.Since it is an older vehicle.I decided to try kseal.The parts store man put it in the radiator on a day it was overheating.within seconds the temp went down to normal.Ive been driving it since summer.yesterday it started to over heat.I put in coolent to fill it..It stopped over heating.But after using kseal last summer my a/c does not blow out cold air anymore.what could be the problem.never had problems with a/c until I put the kseal in.Can you help me figure this out.Thanks.
robert
Dec 20,2021i own a 2017 ford escape 2.0 liter turbo. Warning light came high temp. I imeadiately pulled over turned on heater to pull heat from engine. I was luckily at a convient store when i stopped and refilled raidiator overflow bottle after waiting 30 min. I called ford dealership and made an appt (soonest appt. was week and 1/2). I kept an eye on raidiator over flow bottle and prop added an additional 1/2 botlle of coolant. The dealership said i needed a new motor for $6,700 . The vehicle has 140,000 miles on it. I decided to buy a bottle of k seal ultimate head gasket and block repair. I followed directions, and noticed the leak seamed stopped. 2 days later i went ahead and changed the oil and air filter. I took the vehicle out of town with no problems aprox 140 miles round trip. So far so good... It may be a bit early, but so far i am impressed with the product. Especialy with the alternative bill being much higher. Fingers crossed will post update.
paul bunting
Dec 14,2021Used k seal on my vauxhall vaviro 65 reg. Heater matrux blocked Radiator blocked and head gasket has gone. Avoid at all costs. It seals alright everything
David Reynolds
Dec 10,2021My Jeep Liberty started to show signs of a heater core issue with the fogging up of the windows and the smell of antifreeze. I was skeptical because all products make big claims but I bought & used the K-Seal Pour & Go and once the engine was up to temperature it was fine. I am no longer skeptical!
Raymond E. McDonald
Dec 01,2021I had what was diagnosed by my dealer as needing a water pump replacement at the tune of about $2500.00. I decided to look on line and found the K-Seal product with an e-mail address for Colin who resides in the UK. I reached out to Colin and to my surprise within a day I had a lengthy email describing what may or may not happen with my water pump. He explained that there can be excessive vibration that may preclude success. I was given extensive directions to follow which I followed exactly. The first treatment seemed to do the job, sort of. My reservoir no longer was bottoming out but it didn't stay perfectly. Again I communicated with Colin and he had the courtesy to afford me a free 8 oz. bottle to reapply. (Does that ever happen??!!) Again I followed the directions exactly. I followed your directions to a T. I drove the car through the summer months and now into the fall. I checked my fluids on a weekly basis and I can tell you that K_Seal saved me $2500.00 + on a water pump replacement for my 2013 Lincoln MKS. During the summer the air conditioning blew me away and now during the cold fall months I am warm and toasty!! I am a K-Seal fan and would recommend to anyone especially given the customer service and great care in explaining the product. Again many thanks to Colin, his USA staff and K-Seal!!!
M Hassan
Nov 20,2021I am double minded right now. Before using K seal I used to lose water in the radiator without any visible leak so I was told that it could be a blown head gasket. My car would overheat when the radiator gets empty after doing about 500 miles and once the radiator is empty no more water would be sucked into the radiator from overflow and the car would start overheating. Then I would have to directly fill the radiator. Note: I did have Water Pump and Thermostat replaced so that is not the issue. I used K seal and that may seem to have fixed something BUT now the reservoir tank keeps collecting all the water back from the radiator. No water seems to be leaking anywhere now. I have tried to directly fill the radiator aswell but it gets empty and all the water goes to the reservoir and it overflows. I can also see bubbles in the reservoir immediately after driving. The radiator stays empty even when the car is cold and left overnight. When I accelerate hard enough the temperature jumps from normal operating (80 C) to about 90 C very quickly and then drops back, but does not seem to overheat. I am also having issues with cabin heating up properly on cold wintery mornings now. Cabin heats fine when car is driving but seems to lose its heat sometimes during the drive. My question is that if the head gasket leak is potentially fixed with K Seal could it be that the combustion gas is still trapped in the system and the system needs a flush and coolant replacememt?
Darius Thor von Knobelsdorff
Nov 16,2021Outstanding Customer Service!!!
james price
Nov 16,2021There is never a good time to experience white smoke pouring out of your exhaust while looking in the rearview mirror doing 65 mph and the temperature gauge is pegged in the RED, But in my case it couldn't have been a worse time. My dear friend Lisa was scheduled for a biopsy the next day at a Cancer Facility and neither one of us had enough money to replace the radiator which was pouring antifreeze out of about 30 tiny holes in the top plastic part of the radiator next to the fill hole. I tried using a plastic glue for high temp situations with no luck. Out of desperation I went to Walmart and found a 8oz Blue bottle of KSeal, following the application instructions to the letter, I am amazed and delighted to see that the vehicle (a 2001 Infinity Qx4) is now maintaining temperature with no visible leaks after driving it about 120 miles. I am confident that I can get her to that biopsy appointment tomorrow and thank you so much. I didn't know anything about your product but I took a chance and found it to be EVERYTHING the bottle claimed it was. Thank You Thank You Thank You....Jim Price Follow up on my previous post... Lisa and I headed to the hospital at 5am this morning and I am happy to report that I am sitting in the Surgery Waiting Room while she is currently undergoing the biopsy procedure...WE MADE IT HERE WITH NO PROBLEMS.. Cross your fingers and if your so inclined say a prayer for my friend Lisa....Jim Price
Barton Boley
Oct 23,2021Heater core had a steady leak (class 3) at the inlet; so far, K-Seal 8 oz. has stopped the leak. BLJK13
Kristy Hazel
Oct 20,2021I purchased 2 of the K-seal sealants for my truck from our local O'reillys, it was like just pouring water, did not seal anything! I contacted the company and their response was to give it 10 more days to see if the sealant would work... DID NOT WORK, so I have emailed the company 2 more times afterwards with no response. With the guaranteed to work wording on their product, they DO NOT stand by that. Its a waste of time and money!
K SONG
Oct 20,2021One day, I found coolant level was getting low on my 03 Forester. Upon inspection, I found coolant was leaking around the water pump housing. It was like a drop every 3 sec. Replacing water pump was a huge hassle, so I decided to try K-seal and bought one from Walmart. I removed the radiator cap (while the engine was cold), connected a funnel, put some K-seal and started the engine. While the engine was idling, I kept putting K-seal in the radiator directly and checked the leak. In few min, the drop rate started to slow down, like a drop every 5 sec, and after like 30 min, it became like a drop every 20 sec or so. I left the car idle for an hour, and since then, I don't seem to lose coolant anymore (at least it wasn't noticeable) I don't know whether this is a permanent fix, and that's something I will see, but for now, I am pretty impressed.
Dav Singh
Oct 17,2021I've had my 2002 ford focus for over 15 years and few months back changed the timing belt and water pump. Recently i noticed coolant on my drive and it started getting worse where the water would leak on the drive even when the engine was off and it came to a stage where i had to carry water and antifreeze in the boot. I went to holyhead motors in Birmingham and the guy recommended k seal compared to another 5 brands he had available which were cheaper. Honestly speaking, I'm so glad i bought this product, the leak has stopped and the engine management sign on the car dashboard has dissappered. The best £11.99 well spent😂😃
chris kappert
Oct 15,2021FENOMENAAL ! Vier jaar eigenaar van een Rover 75 1.8 connoseur met automaat . Elke week vierhonderd km rijden en in het weekeind meestal 200cc koelvloeistof bijvullen . Een maand geleden K seal in het drukvat gedaan en wat denkt u ? POTDICHT , geen druppel verlies . Topspul!
andy macpherson
Jan 28,2022Golf mk5 had a serious coolant leak A common recognised issue with a lot of mk5s I was topping up every day with 1 to 2 littes to cancel the STOP warning light on the dash After discovering the reason for the leak I decided to dive KSEAL a try before spending £1000+ on a new head which could also fail Followed the bottle instructions and added 1 bottle of KSEAL to my expansion bottle Incredibly it worked instantly with no warning STOP warning Still working 10 years later No topping up and continued regular coolant changes every 2 years I actually bought 2 bottles thinking such a small bottle couldnt possibly work Well it did work and it saved me a lot of money Amazing results for me