Green-Guard Universal HD Antifreeze/Coolant is a top-quality fully formulated conventional engine coolant with proprietary technological formulation of inhibitors. It provides protection against radiator freeze-up down to -33?F and boil-over to 260?F. This low silicate formulation is compatible with aluminum products, allowing use for automotive, light-duty, natural gas, heavy-duty diesel engine applications such as on-the-road truck, off-the-road equipment, and farm equipment. Recommended and suitable for coolant use when a fully formulated heavy-duty diesel is needed. Including but is not limited to, Caterpillar, Cummins, Detroit Diesel, Ford, GM, Freightliner, International Truck and Engine, Kenworth, Peterbilt, Volvo Mack and Western Star. Green Guard does not require an initial charge of SCA (supplemental coolant additives) upon initial fill and is phosphate and amine free. Formulated specially to protect wet sleeve liners of heavy-duty diesel and is coolant filters compatible, hard water, heavy-duty diesel SCA and other conventional fully formulated traditional engine coolants with corrosion inhibited technologies. Delivers exceptional cooling for the summer and exceptional protection in the winter against freezing while defending all common metals in the coolant system.