PRICE FOR 1 UNIT $8.16 As with the Concentrate, ShellZone Multi-Vehicle Extended Life 50/50 Antifreeze and Coolant protects automotive and light truck engines year round from cooling and overheating. Materials protected from corrosion include brass, aluminum, steel, cast iron, copper and solder. The solution is free of borax, nitrate and amine, and in its unused form, is 100 percent biodegradable. To use, mix with a 50/50 ratio of antifreeze and clean water. It protects over a temperature range of -34 degrees Fahrenheit to 265 degrees Fahrenheit with a 15-PSI radiator cap system. Dispose of used antifreeze/coolant in accordance with local regulations.