Application and instructions : ensure that the engine is cool before opening the radiator cap. For best performance it is desirable to flush the cooling system with water and cooling system cleaner before changing with wuerth radiator coolant. Add wuerth coolant concentrate to water (1:2) in the radiator and change every 30000 km, or two years whichever is earlier or follow the vehicle manufactures recommendation. Periodically check expansion bottle depletion and top us with concentrated wuerth coolant concentrate. Wuerth red coolant can be used for all types of vehicles (indian, japanese, american, european and korean cars)prevent boiling of cooling water in most severe conditions protect radiator from rustprotects engine block from rust/corrosion