Flex-a-lite 50016 Flex-a-Chill Coolant Additive - 12 fl. oz. Provides corrosion protection for aluminum engine parts Contains organic compounds that prevent contaminates such as calcium and magnesium from developing into scales that clog your cooling system One 12-ounce bottle treats 12-16 quarts of coolant with a minimum of 20-percent antifreeze for street applications Improve heat transfer by as much as 20 degrees Fahrenheit Race track surface approved