Prestone, Gallon, 50/50 Pre-Diluted Antifreeze/Coolant, Prestone, Gallon, 50/50 Pre-Diluted Antifreeze/Coolant features an enhanced Cor-Guard inhibitor package that prevents corrosion and helps engines run longer. Prestone 50/50 Prediluted Antifreeze/Coolant with Cor-Guard is compatible with any antifreeze/coolant, regardless of color, and can be used in all makes and models of cars and light duty trucks.