Prestone, Gallon, Yelow, Antifreeze/Coolant, Helps a vehicle's engine last longer with improved extended life technology. Fortified with Cor-Guard Inhibitors, Prestone's patented formula prevents corrosion, helping a vehicle's cooling system run more efficiently. Inhibitors is compatible with any antifreeze/coolant, regardless of color, and can be used in all makes and models of cars and light duty trucks.