Protects Enginge Block From Rust/Corrosion,Prevent Boiling of Cooling water in most severe conditions,Application Area: It is desirable to flush the cooling system with water and cooling system cleaner before changing with wuerth radiator coolant.Care Instruction: Ensure engine is cool before opening the radiator cap.. Add wuerth coolant concentrate to water (1:2) I the radiator.Change Radiator Radiator Coolant every 30,000Km or two years whichever is earlier