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💥 Stop leaks fast, drive worry-free!
LIQUI MOLY Pro-Line Radiator Stop Leak K is a 250 ml additive designed to seal small leaks and cracks in vehicle cooling systems. Compatible with cars, commercial vehicles, and buses, it treats up to 40 liters of coolant and works within 10 minutes of engine operation. Trusted globally for premium automotive care, this product prevents coolant loss and costly repairs with a simple, effective formula.






| Asin | B004FPUUSS |
| Best Sellers Rank | 8,021 in Automotive (See Top 100 in Automotive) 116 in Fillers, Adhesives & Sealants |
| Brand | Liqui Moly |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,970) 4.5 out of 5 stars |
| Date First Available | 28 Aug. 2012 |
| Guaranteed Software Updates Until | unknown |
| Item Model Number | 5178 |
| Item Weight | 275 g |
| Manufacturer | Liqui Moly |
| Manufacturer Part Number | 5178 |
| Model | Pro-Line Radiator Sealer K |
| Oem Part Number | 0 |
| Product Dimensions | 66.09 x 23.6 x 13.41 cm; 275 g |
| Viscosity | 2T |
User
Excellent
Worked a treat on leaking at a joint with radiator rubber hoses
User
Works
Works
User
Great for small discrepancies in your cooling system
Worked for a while but ended up replacing thermostat.
User
Good stuff
I had a small leak from somewhere. Added this stuff and although I still get the odd drip it’s vastly improved. From it, might fail mot to, it should pass now.
User
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.
User
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!
User
Does what it says on the tin
Does what it says on the tin
User
Leaking radiator
No waste of time and money made no difference whatsoever ☹️
User
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 !
User
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
User
يبرد الخاطر
ممتاز و يبيض الوجه
User
Ottimo
Usato per sigillare una micro perdita praticamente impossibile da trovare. Sembra aver fatto il suo lavoro egregiamente. Il contenuto di 250ml è sufficiente per 40l di liquido refrigerante. Il mio circuito (una Matiz) contiene circa 4,2 litri di liquido, quindi dovrebbero essere sufficienti circa 30ml di prodotto. Io ne ho versati 50ml. Il prodotto va immesso a circuito freddo. Dopodiché si mette in moto, si accende il riscaldamento al massimo (così da consentire al prodotto di circolare anche nel radiatorino del riscaldamento abitacolo) e si guida normalmente per 10 minuti (io ho fatto 20 minuti). Molto semplice.Dopo una settimana di utilizzo dell'auto il livello non è sceso, quando prima ogni settimana dovevo aggiungere 2/300ml. Segno che ha funzionato.
User
Süper ürün
Kesinlikle işe yarıyor 2003 model Peugeot 206 su eksiltiyordu devamlı tamamen kesti sızıntıyı
Trustpilot
2 months ago
2 months ago