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💧 Stop leaks before they stop you — keep your engine cool and in control!
LIQUI MOLY Pro-Line Radiator Stop Leak K is a powerful 250 ml additive designed to seal small leaks in vehicle cooling systems quickly and effectively. Suitable for up to 40 liters of coolant, it works within 10 minutes of engine operation, preventing coolant loss without causing blockages or discoloration. Trusted by professionals and everyday drivers alike, it’s compatible with a wide range of vehicles including cars, commercial trucks, and buses.





| ASIN | B004FPUUSS |
| Best Sellers Rank | 6,780 in Automotive ( See Top 100 in Automotive ) 88 in Fillers, Adhesives & Sealants |
| Brand | Liqui Moly |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,878) |
| Date First Available | 28 Aug. 2012 |
| Item Weight | 275 g |
| Item model number | 5178 |
| Manufacturer | Liqui Moly |
| Manufacturer part number | 5178 |
| Model | Pro-Line Radiator Sealer K |
| Product Dimensions | 66.09 x 23.6 x 13.41 cm; 275 g |
| Viscosity | 2T |
A**6
Works as it should
I've used this 3 times now and it's worked every time. Slowly losing coolant and this stopped it dead without discolouring the coolant and causing any blockages. Recommended.
N**X
It worked for me!
Used on Hyundai i40 1.7 cdti that had a very irritating slow leak from somewhere not obvious. I have no intention to plough money into this car.. it's a mobile tip! First time using anything like this as it goes against my inside engineer.... But to be fair, it's been a few months now since adding it and the coolant leak appears to be sealed!
G**D
Great for small discrepancies in your cooling system
Worked for a while but ended up replacing thermostat.
M**N
Highly recommended 👌
Easy to use and work done 💯, Very happy and value for money.
D**N
Does what it says on the tin
Does what it says on the tin
D**Z
Ok
Ok
R**Y
good product
good
T**H
Leaking radiator
No waste of time and money made no difference whatsoever ☹️
L**.
Tres efficace ! Simple d'utilisation
A parfaitement colmaté une fuite au radiateur de mon tracteur. Simple d'emploi et efficace. Je recommande.... si vous avez une fuite dans le circuit d'eau bien sûr !
A**D
coolant leak fixed
i have coolant leak more than month , but now leak get fixed , i recommend to anyone have coolant leak to use this product it very good and reliable
H**3
ممتاز
منتج ممتاز انصح به لتسكير اي تهريب ماء في شبكة ماء المكينه
T**N
Süper ürün
Kesinlikle işe yarıyor 2003 model Peugeot 206 su eksiltiyordu devamlı tamamen kesti sızıntıyı
V**.
ottimo prodotto
ottimo.
Trustpilot
1 month ago
2 weeks ago