Prime® Extended Life AMAM 50/50 is compatible with ANY antifreeze/coolant in ANY vehicle with aluminum or other cooling system metals. The formulas have a blend of long-lasting inhibitors to guard against temperature extremes and the effects of rust, corrosion, and premature water pump failure. Top-off your cooling system with Prime Extended Life AMAM 50/50, which is a blend of 50% antifreeze and 50% demineralized water. Prime 50/50 meets or exceeds ASTM D3306 and D4985 for corrosion protection for cars and light duty trucks, while providing reliable freeze-up and boil-over protection.