K-Seal Reviews 530

I haven’t tried k seal but I will definitely try the ultimate one. Please give me any advice. My problem is that I have small particles of oil on the reservoir I will flush out the coolant I will top off k seal ultimate and fill the reservoir with coolant and let it idle. Can you guys recommend me to do it or pay for engine replacement

Bought a bottle after doing some research, no idea where the leak was from but it wasn’t the hoses. Filled up coolant to correct level and put a bottle in as recommended (shake first) and currently on day 4 with no issues. Was losing about 500ml of coolant a day and now the levels stable. If this sealer lasts I’ll come back and change to 5 stars.

*EDIT* about 2 weeks ago having cooling issues. Water raises in the coolant reservoir and leaks from the top. First thing mechanic asked was if K-seal had been used. Has said that K-seal has caused a blockage and parts will need replacing. It’s alright if you’re in an emergency tbf but other then that best to stay away.

I was 150 miles from home when the 3.5L Ecoboost in my F150 developed a coolant leak. The leak was almost a steady stream coming off the skid plate. I was freaking out as it was a weekend and no one could even look at my vehicle until Monday. I looked online and saw K Seal and after reading reviews decided to give it a try. I went to a closeby O'Reilly Auto Parts. Only needed one bottle for the Ecoboost. Followed the directions and then slowly drove around the parking lot until engine was up to temp. Got out and rechecked the expansion tank and saw the level of coolant was stable. Hit the freeway and drove highway speeds the entire way home with no issues. Temp remained constant as did the coolant level. Great product!a

Long story short I’d been unemployed since 2021. So I hustle doing any kind of job, from fencing to electrical so I need my old 1999 GMC Sonoma to bring income that at least pay for the bills It’s been hard and when the cylinder head of my truck cracked, which I replaced like 4 years ago, I literally cried. Researching K-Seal was the one with most success stories and more affordable than others, I told my wife I will need a miracle or easy $1k in parts and any other damage that the block could’ve suffered. The miracle happened, I was skeptical cause the leak was bad trying to turn the engine on once and the spark plug well will fill with antifreeze.
I poured K-Seal on the radiator crank it on, one minute of the engine stalling and suddenly, the miracle.

It work stopped my leaks and saved me a large amount of money for repairs whoever created this product is a damn genius thanks so much. 10/23/2023 the next day my car started back leaking and in the same position so I may be something too hard for k-seal to handle. Doesn’t mean it doesn’t work because there’s too many people saying it does.

The previous owner of my truck had bypassed the heater core, because it leaked( really bad, as I found out today ). I decided to try a sealant, instead of spending 10 or 12 hours replacing the heater core. I did some research and read lots of reviews and decided to try K-Seal. I hooked the hoses back up, and poured about 1/2 of the bottle in the radiator. It leaked really bad, for about 2 or 3 minutes. Then the leak changed to a steady drip. After the thermostat opened and the coolant started circulating, it stopped dripping, and I was able to pour the rest into the radiator. After getting the air out of the system, I ran the truck about 45 minutes. No leaks, no drips, and GREAT HEAT. I was kinda skeptical before I tried it, but not any more. I will recommend K-Seal to anyone with a leaking heater core. I can't comment on any other leaks, as I didn't have any. But, so far, it is truly awesome! I'll add an update after a while, to see how long it lasts. (I have a Degree in Automotive Systems Technology, formerly ASE certified, 20+ years experience)

Contacted them several times they never sent me form to fill out for my purchase. For refund was lied to and ignored my head gaskets are blown. They didn’t refund my purchase

BMW 330 iperformance hybrid.
Mecanic told me to put 2 small bottles of K seal as coolant was leaking..It worked initially l,leaked stopped,but in few weeks leaked again.Addes 1 more bottle of K Seal,its not leaking anymore but now my car will not give air con and heat,and we approaching cold weather in Uk,Went Bmw,went other mechanics,everything seems to complicated,Bmw said is better to get rid of the car cause they said it will cost me probably more money repairing the car,other mechanics simply have no clue what to tell me,either radiator,either battery or other things,no one knows what this car have..Please help!

Hi. K-seal worked well with my Subaru car a month ago, which had a head gasket leak before. Would my car now be safe to drive for a long distance about 200 miles? Please give your advice.

I had a small leak on top of my car manafolds near the injectors.I ussually don't beliave on these products, but this product does exactly what it says it does. In less than 30 seconds the product started to work the leak stop the engine started to work better I still can't belive that such a small bottle can do so much. I really thought that it wouldn't work, but the product started working rightway.

K seal is for real... Had a leak undercarriage and tried another cheaper product first... NO HELP!!.. ready to give up and about to take my Benz in for service and tried K seal and Boom... No more leak ... Im a believer in K seal

I bought K seal for my van which was losing water couldn’t believe it so far so good 2 weeks in hasn’t a drop I think the key is to read the instructions carefully do a decent run in your vehicle and it should cure it

Brilliant product, does what it says it does, I needed to contact K Seal,I got the best customer service I have come across in years. It may seem more expensive than others ,but this works where cheaper ones in tried didn't. Big Thanks.

I was losing water. The garage fitted a new radiator but this made it worse. There was a bit too much pressure in the cooling system and the header tank wasn't working. Garage said it's a cracked head or headgasket. £4,000 repair and three weeks at least off the road. My other option was to buy a new vehicle £38,000. My vehicle is a taxi and is my livelihood. I used KSeal head gasket repair and it worked. All pressures are good and zero loss of coolant. I can't thank you enough, best £32.50 I've ever spent.
I think there was a crack between the water jacket and the exhaust. Hyundai i800 2.5 diesel.
Thank you 😊

I will update this on if the product worked seeing I just added it a couple days ago.

I just want to commend how incredible the customer service is for this company. Usually with big companies you don't get quick responses or helpful responses. K-Seal exceeded every expectation I have. They were quick to respond, helpful, and gave great advice. I really hope this product works so I can give the full 5-stars

Used it in a 325i bmw. I followed the instructions to the letter and no more leak.

I went out for a ride on my motorbike and came across a road with newly laid chippings. One of which punctured the vulnerable radiator. I used k seal and again the leak is plugged.
2 vehicles, 2 100% successes. I think the secret is to FOLLOW THE INSTRUCTIONS !

I have a Mercedes clk with a heater matrix problem purchased a bottle to put in was extremely thick to pour ? Does not seem to have worked

I BOUGHT THIS FOR MY FORS TRUCK WITH A SIMPLE HEAD GASKET LEAK, IVE GONE THRU 2 BOTTLES AND STILL DOING THE EACT SAME THING...I PUT MY TRUST INTO A FAULTY PRODUCT..IVE BEEN OUT OF WORK FOR ALMOST 2 WEEKS BECAUSE THESE FLAT OUT LIED ABOUT THEIR JUNK, DONT TRUST THESE PEOPLE....DO NOT...I REPEAT DO NOT BUY THIS AND EXPECT IT TO WORK FOR YOU BECAUSE IT DONT...THEYRE LIARS!!!!!

Does this seal a head gasket my car is a 2010 insignia 2.0 eco flex I’ve replaced my clutch gearbox oil cooler and now apparently the head gasket is no good starts but after 10 miniutes of driving the gauge gradually does to max and the fans kick in can anyone point me in the right direction please?

My 2005 Jaguar XK 8 had a cracked thermostat housing and quite a healthy leak. Given it's a discounted part and not one available anywhere on the globe, I tried K-Seal. It has work perfectly. Thank you!!