K-Seal

4.0 (493 Reviews)

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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

4.0

Out of 5.0

Kyle

May 28,2018

So I was driving my Audi TTS and all of a sudden my coolant light came on, so I stopped and purchased some more put 1L in. Within the next morning it had all leaked out I forgot to check so set off again then it came on again, I was stranded for a couple hours unable to do anything I called AA they wanted £110 to come and help me so then I looked online and found K Seal bit hesitant but out of options I called a friend he purchased it and another bottle of Coolant and so far so good will see how it is tomorrow.

Amy Trivette

May 18,2018

I have a 2005 PT Cruiser and I was having some issues with the cooling system after my sons drained and flushed my radiator there was water leaking from somewhere and I saw this product on the shelf and decided to try it and it's seemed to have really fixed it and I couldn't be happier I am going to buy another bottle just to keep in my car just in case... I actually told my best friend about this and she bought a bottle too and said it fixed whatever was going on with her car so I definitely would recommend to anyone... thank you guys

Tőtős Alpár

May 15,2018

Had a leak somewhere in my cooling system on my 2008 Kia Ceed 1.6 diesel that we couldn't find.Poured K seal in and seemed to solve the problem or at least was loosing much slower.However took it for a pressure test and came back as all good,there was no leak according to the mechanic.However started loosing again very slowly,wondering if I shall give a try to a second bottle??? Anyhow very good product in my opinion.

Dan

May 12,2018

I purchased K-Seal Ultimate Head Gasket Repair and followed the instructions on bottle step by step. But basic logic should have kicked into my head. Engine parts need to move about freely (literally, why it needs oil as a lubricant). This product is a clogger/sealer. The opposite. Literally killed my car from total engine failure. Afterwards, my mechanic had told me it took his whole team to pull and pry the cylinders back open that were "sealed" shut. This product promises miracles, and I should have known better. I would like to see this product removed from store shelves.

Gabriel Figueroa

Apr 30,2018

I have a 2009 Nissan Murano which had a leak in the radiator. I had just replaced it 6 months prior and we were in the middle of a road trip. I kid you not, I read the reviews on K-seal, bought it on a leap of faith in a parts stores we pulled up at and haven't looked back since...This was a year ago today. Still holding strong. Thank you guys for making one of THE best products I have ever used. Made this account just to share this!

Tony Brooke

Apr 25,2018

Used a single bottle of K-Seal "Pour and Go" to repair a 3" long crack in the side of the engine block of my 1960 Massey Ferguson tractor's Perkins P3 diesel engine which was seeping coolant down the outside of the block below the manifold. After 15 mins idling from cold and then topping a 1 acre grass paddock, the leak is completely sealed. What a great product.

Feelander 1

Apr 09,2018

Used K-Seal in my Land Rover Freelander cooling system in August 2017. Began to leak slightly from same place 6 months later. Contacted Kalimex with proof of purchase and they sent me a replacement bottle of K-Seal for free. Added same and leak free again. Great product, great service. Highly recommend.

Michael Delaviez

Apr 07,2018

I had my truck diagnosed with a crack in the timing cover. Two mechanics suggested that I should replace the engine. I contacted K-Seal to ask which product they would suggest me using. Patrick suggested st5501. Two weeks later and not a drop!!!!!! Not only is the product great, the customer service is even better. Thank you Patrick and Colin. K-Seal is indeed the miracle in the little blue bottle. The piece of mind from the quick repair is priceless!!!!!!

Christopher

Apr 01,2018

I had a seriously blown head gasket on an isuzu engined diesel astra.used k seal ultimate and the problem all but stopped.after a week the cooling system began to pressurize again.I called the helpline and spoke to a very knowledgeable guy called colin.who arranged for me to collect a replacement bottle from my local car parts shop within 10 minuets.this totally cured the problem..1500 miles later.no coolant loss and no pressurization of system..and the heater works!..excellent product and awesome customer service

Aric Greco

Mar 17,2018

I don’t know where to start with this awesome company and product. I recently purchased a 2001 Subaru Outback as a second work vehicle. The 2.5 boxster engine was prone to head gasket failure and after having the vehicle certified I noticed a small coolant leak, probably the start of other possible coolant problems. I first did a lot of research online regarding possible stop leaks to use. As you are aware there are many. If you know a little about vehicles and cooling systems then you realize all of the extremely small passage ways that can be clogged up using a product like stop leak. Even the product Subaru coolant conditioner, Subaru actually recalled affected vehicles and ordered this product to be put in because the head gasket issue was so apparent, the product is only a repackaged product by Holts called Radweld, and the particles (chunks) (linseed) are much much larger than K seal and could easily clogged up a heater core or other passage ways. And remember this is a product Subaru put in and sold themselves. So in comparison K seal is a far superior product and way safer in this application and does not clog up any part of the cooling system, a claim made by other products but I have heard they do clog. In all, they way they designed the size of the particles and the way it stops the leak is a lot better than any other product and I really believe in it. I will be keeping a spare little Jug of it and my girlfriends car at all times. Finally, the company itself. I contacted the company via email regarding a question about adding more k seal after a coolant change and within the hour I received a personal phone call and a email detailing my answer. I regard this and the level of caring ness for the customer as some of the best customer service I’ve ever experienced. All I have to say is good things about this company and I hope they continue to Prosper for 2018 and the future. Thank you for saving your customers money and creating a REAL stop leak product. Aric Greco

Jim Geddis

Mar 12,2018

It appears as if this K-Seal product does works, I don't see any leaks going on where I poured the product into the antifreeze area that seemed to have been the place that was leaking. So for the price of the product, I have to say it seems to do what it says it would do. Which would hopefully save me more money in the long run & I am sure it will. Thank you for making this product.

John

Mar 12,2018

Do not buy this snake oil . Thats what it is. It does nothing at all . Waste of time and money. Plus I has to flush sll that crap out of my system . I should have known it would not work at such a chep price , but thats how they sell it. Promis everything and deliver nothing ! So ill repeat myself. DO NOT BUY THIS CRAP ! Im going to try Blue Devil next,hoping for better luck.

Trevor Phillips

Mar 02,2018

Brilliant product, first class customer service. I was extremely dubious having used & failed with similar products, but having researched this product & after speaking with their first class customer service decided to give it a try. Worked brilliantly, only thing I would say is that the product states: works in approx 1 to 5 mins took more like 30 - 45 mins but cured my leak without any problems. Would definitely recommend this product (5 stars all day long) Thank you K-Seal .

Brandon Pegg

Feb 28,2018

After finding out I had a very bad intake leak on my Ford Expedition. I was in the air on what to do. I was loosing coolant as soon as I put it in & could actually see it leaking from the intake. I did not want to do the repair as I was looking at $1500 easy & the truck is older. I was wondering if those (stop leak) products actually worked. or was just a temporary fix. And really good marketing. as I've herd nothing but bad stories From clogged heater cores and rads causing more damage then good. But after watching, and seeing, the amazing results people were having with k seal. I figured I had nothing to loose. After buying K seal. It was extremely easy to use. No messing around. Just shake, pour, and go! I poured k seal in my overflow tank. and let me engine get up to temperature. And drove the truck for about an hour or so. Then Re checked my coolant level. And it was honestly at the same level and no leaks. I figured this was a good sign. But did not hold my breath. on it actually repairing the issue. It's been 40 days now and I'm still completely leak free. I was going threw a big jug of coolant a day. To now adding none. I'm extremely Happy with K seal. and would highly recommended K seal. to anyone thanks again. for making a product that actually does what it says & performs ‎ Cheers Brandon ‎

Ron

Feb 08,2018

Coolant leaks for weeks couldnt find it so recommended K Seal... Boom fixed no leak. Thanks K ;-)

Gerry Victor

Jan 08,2018

Added to my cooling system which looked like coffee and drove so far over 100 miles and at times my heater was over 80 degrees. No issues from the sensors or cooling fan and rarely did my temp go to the middle of the gauge. I plan to back flush the system install a new T stat and add fresh coolant this up coming weekend.