K-Seal Avis 

I was pulling a 30' camper with my Hummer H2 when I started loosing antifreeze. Looks like the water pump seal was giving out on me. I stopped at AutoZone and purchased K-Seal and added it to my water reservoir and to my surprise the leak was gone in about 3 minutes! Still 4 weeks later and no leaks and no engine problems! Thank you K-Seal 👍

David Mullinax of Ellijay Ga

I have been in the parts sales field for over 10 years. I have seen K-seal not only seal small but also very large leaks that I thought there was no hope AND IT LASTED months to years....sometimes it outlasted the rest of the vehicle. This is the only product to buy for coolant leaks. Please never buy one of those tar/sludge sealants they will cause you more trouble down the road where K-seal just provides you with more protection down the road!

I used KSeal in my car a Renault Megane, Did everything according to the instructions.. absolutely useless. the car continues to lose coolant. A complete waste of money.
Response to K Seal's reply. ..
The symptoms are air bubbles in the expansion tank, no overheating no smoke, Followed all instructions on the bottle.. it did not work. What more can i say?

Used this on my work runner a small holden barina, to be fair I didn’t expect it to work but was pleasantly surprised hasn’t used coolant since and it has stopped mixing with the oil all though it was only a small leak I was impressed

I had a head gasket leak, my mechanic confirmed it. It was leaking coolant and needed to be refilled about every week and a half but the car ran and as long as I kept adding coolant it work.
But with winter coming up I knew I needed to do something about the issue if i wanted to save my wallet in the future, I read k-seals sight and based on the confidence and seeing no downside purchases some.
Followed instructions ran the car for 8 minutes up to operating temp, turned it off, drive it to the store, all was well, parked it. Wake up the next day, take it out get 20 miles out of the city and boom, engines hot, I step outside and see this trail of coolant behind me and I’m standing in a puddle. Pop the hood the cap blew off and the tank is EMPTY, all gone!
Fill’er back up and think at least I can keep filling it. WRONG under a quarter mile down the road and I gotta stop again, luckily I didn’t get run over but the tank is pulsing up and down and spurting out coolant. Luckily though I don’t have to worry about my other leak, just an engine that has no cooling and runs for a minute at a time instead of a week and a half…

After viewing said reply I have reached out and have not heard a response, will update as they come.

After reaching out a second time purely about a refund I got a reply. Also instructions for k-seal bottle listed 5min ( or had no time constraint and I got the 5 min from the internet ) but even so the engine work for about an hour after adding it and it worked before adding it but after adding it stopped working.

Buy this product!!

When it comes to my vehicle, I am probably the most anxious person ever. So, when I started to lose coolant at a very fast rate, have some smoking, etc. my anxiety skyrocketed. I had many of the warning signs of an impending head gasket issue. I researched what I should do, how I should fix it, and I came across K-Seal. I was skeptical to say the least at first, because I have read horror stories about how people have put sealing products in and then their engine and other vital components get gummed up and end up breaking. I reached out to an absolutely fabulous gentleman that I saw responding to reviews on this website and spoke with him via email about my vehicles symptoms, overloaded him with questions, etc. I felt confident after chatting with him that K-Seal was going to help (and at the very least not hurt) my vehicle.

I followed the instructions on the package (July 2022) for adding the K-Seal and monitored my vehicle like crazy in the following days/weeks. I was nothing short of amazed when I noticed that my vehicle was actually holding coolant and all the issues I was having related to this problem before were not happening anymore! There was only one instance about a month later where I had lost a decent amount of coolant, but I believe it was related to extremely hot weather temperatures since this was the summer (August 2022) and we were going through a heat wave. Once I filled my coolant, there was no loss anymore. I had contacted the same gentleman I corresponded with and he agreed it was more than likely due to the heat, and was kind enough to send me another bottle in the mail to use in the event that I had to. I've not yet had to use it, but if I do then I am confident in putting this product in again!

I have a 2005 Jeep Grand Cherokee, and it is my life. I live in the mountains so there is no public transportation, and I also own my own house cleaning business so I rely heavily on my vehicle and cannot be without it. I cannot recommend this product enough for those who have coolant/head gasket issues. If you are anxious like I was, reach out to K-Seal and talk with them first to see if this will help you - they will respond! It will help to ease your concerns, I promise you.

Thank you, K-Seal, for helping me keep my vehicle running! I will recommend this product to anyone in my situation or similar! :)

-Heather, from New Hampshire, USA

Well nothing worse than that smell of leaking coolant in your car then the warning light and then the sodden mat in the drivers footwell. The cause was a leaking heater matrix on my Ford C Max. Top up and leaked out...garage said £1,000 to fix...what?, no way. After a trawl on the net I came across this product...well time to try I thought. Followed the instructions and waited. Engine on and wait to heat, at first there was leakage but once it reached working temperature it seemed to hold. Only 75 miles in and now no leaks...Happy days and thank you, all for £12.40...result. Update in a week.....

Ok so I haven't tried the K seal yet.
My 2006 Nisaan Xterra was overheating so I took it to Midas (they do all my major auto repairs) They did a compression test and it failed. 😪
Said it will be $4000 usd to repair. This is our only transportation for my family. So I'm praying this works. Stay tuned for the results. Wish me luck Colin!

My 2003 Volvo S60 was losing coolant and I was getting "Turn off engine" warnings. Whenever I turned on the A/C, the coolant would drain. I diagnosed online for what could cause this, and was seeing radiator replacements costing nearly $1,000. Fortunately for me, I came across K-Seal. So easy - I poured it into my half-full coolant reservoir and drove around for 30 minutes. Not only did my A/C run ice cold, but the coolant level remained full! Immediate results and a savings of $1,000! Based on many other reviews, I'm confident I'll get another 10,000 miles or more without any more coolant problems.

I will admit I was a little skeptical, but this product is amazing. I have a 2004 BMW 325ci that was leaking coolant. With it being almost 19 years old I didn't want to put a ton of money into figuring out why it was leaking coolant. I bought the K-Seal Ultimate, put it in about a month ago and haven't lost 1 ounce of coolant. And my car is running better than ever!

Dear KSeal
Good Afternoon! As a Commercial Pilot and Aerospace Engineer; actions speak louder then words. Recently, my 2009 Murano 3.5L AWD with 120K Miles; developed an internal Engine Coolant leak. Originally, using k&W, sealed the radiator. However; failed to repair the internal engine leak. After a two week waiting period; purchased Kseal multi purpose and followed specific instructions. Within minutes; the KSeal Performed as stated and sealed the internal leak. It has only been several days. However; the water level is being maintained. Great Job of saving me thousands in $$.
Regards
Capt. Doug

i have a ford focus 1.0 ecoboost (eco boom) engine , just done 83k , noticed on cold start up a misfire , just thought it needed a service and new plugs as it was over due , on inspection on cold start up misfired and a puff of white smoke , did a compression test and found out cylinder one was down on compression , with these ecoboost engines apparently they are not designed to be fixed and are a throw away engine ? so thought i would try K-seal ultimate bought it off ebay popped it in and wow fair play stopped the cold misfire and no loss of coolant and no white smoke , just done an other compression test and all cylinders now read the same , i am really impressed and thanks to k seal they have save me alot of£££££ , thank you i would recommend it to any one

I just replaced my water pump for the first time (meaning I’ve never done it before). For a couple days after I noticed some coolant on the ground after I parked for awhile. My hunch was that the gasket wasn’t sealing properly. Instead of taking it all apart and starting over, I added a bottle of K-Seal to the expansion tank. I drove for about 45 minutes and the leak was gone. It’s now been 3 days and no leak. This stuff works!

Hi Colin,
I am at GL16 7PB
I have a Transit camper (ex flareside) PJI 9345 2.5L
It has developed a heavy drip coolant leak from back end of engine head,so cannot see it but coolant starts appearing after engine idling 15/20 minutes from cold. No oil in leaking coolant, no water in oil, no white smoke, engine fine. Spotted it the other day with expansion tank low after a short (8 mile) journey. I presume it is a crack. Is this repairable with K-Seal and what chance of permanent success?

I drive a 2000 Chevy S10 with the 4.3 V6 vortec engine. Noticed a leak and sourced it to the upper bypass hose. Replaced it and noticed water pump weep hole was spraying driver side. Went to Advance Auto and bought the eight fluid ounce k-seal. Let the truck cool in the parking lot for an hour and then added it to the radiator after shaking it for 45 seconds. Added water to my radiator cranked it up and drove it lightly home 4 miles away. Parked it in the shade and let idle for 40 minutes with the defrost on heat full blast setting. Appeared not to have any water flow at this point. Truck was out of gas so drove it up the road and put a few bucks in it, then drove it up the road for a few miles. The temperature stayed at 208°. Drive it a few miles back home and parked it. Turning engine off pop the hood and notice a tiny spray hole coming from the water pump, driver side. At this point I don't know what else to do I tried to call the helpline and it is 11:15 p.m. on Saturday so they are not open. I have to work in the morning and it's a 20 mile drive. Got 2 gallons of water in the back, wish me luck.

My 2018 Ford Escape 2.0 T had the beginning symptoms of head gasket failure (actually it looks like a Ford design defect). Rough idle at cold start and white smoke from consuming radiator coolant. Dealer said 'long block replacement' required, an expensive repair. I used k-seal and the engine now idles properly and no more white smoke at startup. Not sure how long it will last but it is impressive that it worked. I really had nothing to lose trying k-seal since the repair costs are close to $10K CAD.

I just used K seal in my 2008 Buick because I had a radiator leak and blown head gasket. It worked great but now a month later, it is running hot. Is it possible I need a new thermostat or to have the radiator flushed or both. I hope I get this problem solved as I don't want to trade cars in this market.

Had a crack in an oil cooler on the turbo, only leaked when engine was cold. Kseal stopped the leak.

Rebuilt a 2019 F150 with 20k miles. After complete, lots of dripping along exhaust pipe led me to believe i had a head gasket leak. The radiator was dry so recovery personnel must have run truck without coolant to overheat the engine. Did my research along with testimonials. Installing K-seal solved all leaks. Cabin heat works normally. Just bought another bottle to fix a 12 jetta. Thoroughly comfortable with product

Ultimate head gasket repair worked 100%. Awful misfire and rattling investigated by garage - camera down showed rusty head gasket due to liquid ingress. Coolant levels down drastically after one drive. I put the k-seal in and followed the instructions and next morning, no misfire, driving fine. That was 3 weeks ago and all is still good!