The Prestone 50/50 Prediluted Antifreeze/Coolant has the protection of Preston’s Cor-Guard formula and can be used to top off a car’s cooling system. Prestone antifreeze/coolant with Cor-Guard corrosion inhibitors is five times more effective at protecting against corrosion than the leading competitor, according to the company. It reduces the risk of breakdowns and keeps engines running longer. Prestone 50/50 Prediluted can be used in any car or light duty work truck and works with any color antifreeze.