Valvoline Cooling System Stop Leak is an instant sealant engineered to provide premium protection against leaks and sealing damage. Thanks to its high-quality leak sealing components, this product is highly effective and able to stop leakage immediately following its application. Moreover, it is designed to stop seal sweating and protect against losses caused by evaporation. Valvoline Cooling System Stop Leak is recommended for all types of cooling systems present in diesel and gasoline engines.

Valvoline Cooling System Stop Leak provides outstanding protection against sealing damage that affects cooling systems and combustion chambers. More precisely, it:

• Stops leakage in a matter of minutes.
• Offers long-lasting results.
• Provides effective protection against evaporation losses and seal sweating.
• Does not leave the cooling channels blocked.
• Enables easy and quick application.
  

Valvoline Cooling System Stop Leak can be used in various cooling systems of both diesel and petrol engines. It is also suitable for use in closed cooling systems.

In addition, Valvoline Cooling System Stop Leak is compatible with all types of coolants and antifreeze and does not cause any damage when applied to plastic, alloys, rubber, and non-ferrous metals.  

Valvoline Cooling System Stop Leak is used to address leaking connections of a cooling hose, hairline cracks that may affect engine block, radiator, and cylinder head, and cylinder head gaskets prone to leakage.