K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

Well well well, this small bottle of liquid worked perfectly, and months later still no leaks. So happy

This stuff is great and got me home after my radiator sprang a leak on my motorbike

Seemed to be working, naturally the full extent can’t be measured, but didn’t regret the purchase, good value for money, worth a try to be honest, easy to use.

Great product. I had a difficult to locate leak on my cooling system, the tank was empty/below the minimum line every morning. I topped up with new coolant to minimum, added all the KSEAL, then finished topping up with coolant to just above the max line & took the car for a good half an hour drive with the heating cranked up to max for the duration of the drive.Check my levels this morning & I haven't lost any coolant overnight. Perfect product for fixing the job.

This really does work!!! My car has been leaking coolant for a few weeks now and I have been topping it up every few days with coolant until I had a chance to take it to the local garage. Then I found this small little bottle of K-seal and it does exactly what it says. When it was delivered and I saw how small the bottle was I thought oh no! But I shook the bottle and added it to my coolant tank. It’s been one week now and the coolant level is still the same. Not dropped at all. Hopefully I won’t need to buy it again but I will definitely recommend it. Give it a go it’s SO much cheaper than a trip to the garage!!!

I purchased a bargain car that I knew would require some work to put it right. When I purchased the car the engine was lacking power and the idle speed was hunting (going up and down). As the engine oil was ok I thought I'd try cleaning out the fuel & exhaust system first using Injector cleaner, turbo cleaner fuel additives and diesel particulate filter cleaner additive to burn off any soot built up in the exhaust. After I'd tried all of those each one on a full tank of fuel I'd probably done 1,500 miles and the car had more power and the idling had improved. I then noticed the car had started to lose approximately a pint of coolant over 10 miles and I think there was a slight whitish haze in the exhaust smoke which shouldn't be there as the car is a diesel. I wondered whether I'd caused the coolant leak by using the fuel additives as they contain detergents. I suspected the coolant may be escaping via the head gasket or maybe via the exhaust gas recirculation cooler into the exhaust so decided to try K-Seal. At first I thought the K-Seal had fixed the leak but after a couple of days the car started smoking again and the coolant loss was about the same as before I had tried the K-Seal. Unfortunately during those couple of days the K-Seal had made a proper mess inside the coolant header tank and as the header tank is made of white plastic lots of copper particles and gunge can now be clearly seen coating the inside of it above the coolant fill level. I have since wondered whether the previous owners may have already used a leak repair to hide a head gasket problem and if so whether it would have impaired the efficiency of this product but have no way to know if that was the case. I decided to try one more cheap fix before considering a garage repair so purchased a competitors product that was cheaper than K-Seal and does not contain all the copper particles. The cheaper product has currently stopped the coolant loss but it would have mixed in with any remaining K-Seal in the engine block so maybe they are complementing each other now. In conclusion, this probably does work in many cases but in my case, it didn't work. I am pretty sure that in many other cases it probably also makes a proper cosmetic copper splattered gunge mess inside the header tank. In hindsight, I think I'd only try the K-Seal again if I could add it directly into one of the cooling pipes so the whole bottle doesn't start off in the header tank or alternatively I'd add it to a warm system so the thermostat would already be open. Also if there is ever a next time on another vehicle personally I'll try the competitor's product first as it was cheaper and didn't make a mess inside the header tank.

Used this several times in the past works great

Put this in a Citroen DS3 1.6 vti a year ago as it had a small leak on the oil cooler. After a year the coolant has only started to drop again - ordered some more, better than removing the manifold etc!

Great product

Seems to stop leaking from plastic header of the radiator.

The best coolant leak repair product available!I have used it many times on leaking radiators and cracked engine blocks.Really good product,does the job every time.

merhaba aracımda 2-3 günde 50-60 km kullanım sonrasında 500 ml kadar ciddi bir su eksiltme problemi vardı 20 şubat günü ürünü kullanım talimatına uygun olarak yedek depo içinde full antifiriz varken kullandım ilk kullanım sonrası 250 ml kadar bir eksiltme yaptı üzerini max çizgisine kadar tekrar antifiriz ile tamamladım 45 gün kadar oldu her hangi bir eksiltme olmadı şu an için daha önce kulladığım bir çok üründen daha başarılı

It actually worked , saved me $$$ in repair on my 11 year old chevy cruze at 189,000 miles . The coolant was leaking so much - that I had to refill every 2 weeks.