Servo Kool HWC is an ecofriendly long life radiator coolant for passenger cars and light commercial vehicles. It is free from amines, borates, nitrites phosphates and silicates. For optimum cooling efficiency 30 parts of the fluid is to be diluted with 70 parts of the distilled water in most of the vehicles .and 50:50 concentration is normally adopted for commercial vehicls. It sustains its performance even when used with 700PPM hardness water. Servokool HWC 50 is a 50 :50 concentration of Servokool HWC and water. Servokool HWC 30 is a 30 :70 concentration of Servokool HWC and water.