PREDILUTED ANTIFREEZE AND COOLANT: Phosphate-free formula is compatible with all heavy duty vehicle cooling systems, protecting against corrosion and scale buildup system metals or other components. This item contains a bittering agent called Denatonium Benzoate. INCORPORATES NITRATE: Provides a wet sleeve liner protection against cavitation and damage in your engine SUPPLEMENT COOLANT ADDITIVES: Equipped with the necessary SCAs to make your initial fill and refills easier with a lowered risk of mixing errors CONTROLLED CONDITIONS: Grants optimal continuous protection against freezing and boil over LONG-LIFE: Designed to last the entire life of the engine when maintained with a high-quality SCA filter system