

🛠️ Fix leaks fast, drive worry-free—because your engine deserves the best!
The Award Winning Steel Seal is a cutting-edge engine cooling system additive designed to permanently repair side leaks in cylinder head gaskets and engine blocks. Compatible with all water-cooled engines, it uses a unique thermochemical bonding process to seal leaks without disassembly, preventing coolant loss and engine damage. Its filler-free formula protects against blockages, offering a quick, durable fix trusted by thousands of drivers worldwide.











| ASIN | B004BU44H0 |
| Best Sellers Rank | 19,750 in Automotive ( See Top 100 in Automotive ) 200 in Fillers, Adhesives & Sealants |
| Brand | Steel Seal |
| Customer Reviews | 4.0 out of 5 stars 514 Reviews |
| Item Shape | Round |
| Manufacturer | STEELSEAL |
| Material | Alloy Steel |
| Shape | Round |
A**N
Highly recommend
This stuff worked for about 6-7 months when I contacted the seller (steal seal) they where more than happy to stick to there policy of lifetime guarantee and after I sent in proof of purchase and a claims form they sent out a new bottle. I will recommend this product to anyone in a sticky situation and needs a quick fix for there head gasket. My
A**S
Almost worked
I wasn't sure if this would work as I was losing about 170ml of coolant a day and had water in the oil. I used this product as directed, took it for a few miles drive, let the engine cool and topped up with water to the fill line. I checked the coolant level after a few days and it was ever so slightly below the fill line. I can still smell exhaust fumes inside the cabin when idling which suggests that exhaust gases are seeping into the heater matrix so it hasn't fixed it fully but I think it may have bought me a little time. I'm scrapping the car soon anyway I just need it to survive another few months until I can afford another car.
L**R
It works
I looked specifically for this item as I’ve come across this before & found it the best remedy
D**Y
Didn't work
I had a leaky head gasket and was hopeful Steelseal might fix it. I followed the instructions fully and even tried the additional instructions for when you have coolant baj pressure. Nothing worked even a little. Total waste of time and money.
M**E
Worked!!
Empty your coolant out and flush with water then fill with water pour in steel seal and let it get upto temp so thermostat opens then after 30 mins turn off and leave it till next day then start car go for drive and it should work!
D**S
Not sure if it’s achieved anything ?
Not sure if it’s done anything, still losing water, still got gas in the expansion bottle.
M**E
My car is still running!
I had a leak and my mechanic told me to purchase this - so far so good no more leak and the car is still running
M**D
it seemed to work on my Jag v6 diesel
it seemed to work on my Jag v6 diesel Would be five stars if it wasn't so aggressively priced. I did some research and there would be no problem for them to make the chemical more concentrated and not required two bottles. £80 As it is the chemical that is not at maximum saturation point otherwise they wouldn't be able to dye it yellow. The money back guarantee has more get out clauses than budget car insurance 🤑 Nonetheless the crux of it is the product seemed to work
Trustpilot
1 week ago
2 days ago