HDD TRUCK COOLANT BLUE is an advanced heavy duty diesel (HDD) formulation anti boil/anti freeze coolant with nitrate / nitrite chemistry. The product is based on a combination of organic technology corrosion inhibitors with conventional heavy duty chemical inhibitors common to USA technology for compliance with Cummins, Detroit and CAT equipment that contain low silicate, nitrite, nitrate and molybdate. This coolant contains nitrite based technology.