Super Tech Extended Life Prediluted 50/50 Antifreeze/Coolant - 1 Gallon is specially formulated with industry-leading additives to provide optimum performance in all makes and models of cars and light-duty trucks. It is ideal for top-off or drains and fills and provides up to 5 years or 150 000 miles of protection. Providing protection against winter freezing and summer boil over it also provides protection against corrosion of cooling systems metals. This high-quality defoamer is non-harmful to hoses plastics or gaskets and is free of phosphate borates nitrites silicates and amines. Give your vehicle superior protection with Super Tech Extended Life Prediluted 50/50 Antifreeze/Coolant.