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Supplier details checked 2026-09-23 · Test catalog
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For water based cooling system with or without filters. Safe with aluminum or plastic radiators. One can is sufficient for 10 liters (2.6 gal.) of coolant. Compatible with most types of coolant or anti-freeze. May be used as a preventive.
Radiator Stop Leak
Compatible With Conventional Coolant Water Refiners And Antifreezes
Permanently And Reliably Seals Hairline Cracks And Small Leaks
No Negative Side Effects On The Water Pump Or Heating Circuit
Suitable For Aluminum Radiators
For Preventive Use
Shake well before use. Add contents to the cold cooling system. Start up the heater. Then drive the vehicle for at least 10 minutes. The contents is sufficient for up to 10 liters (2.6 gal.) of coolant.
LIQUI MOLY 250mL Radiator Stop-Leak
LIQUI MOLY Radiator Additive
Radiator Additive
Will immediately seal small leaks caused by external damage, porous solder joints and hairline cracks in cooling systems of all water cooled engines. Coolant is prevented from entering the combustion chamber due to internal leaks from head gasket etc. It does not react with oxygen or heat and will never prevent system flow or cause overheating. Radiator Stop Leak works as long as its in the coolant.
Radiator Leak Sealant
