Wynns Professional Formula Cooling System Stop Leak 325ml is an oil-soluble supplement designed to stop and prevent engine oil leaks without dismantling. It effectively stops and prevents leakages in the radiator, cooling, and heating systems, including head gasket leaks. This formula will not harm rubber hoses, gaskets, or other system components and is compatible with all antifreezes and coolants, including OAT coolants. It is formulated to avoid clogging of radiator waterways and temperature sensors, offering enhanced protection against rust and corrosion. Suitable for all water-cooled systems of petrol, diesel, and LPG engines, it can also be used as a preventive agent.