These AF-1204 Permanent Ant-Freeze Coolant contains organic antifreeze, inhibitor, rust inhibitor, corrosion inhibitor and defoamer, it can effectively prevent the tank from overheating or freezing. And have anti corrosion and lubrication function for metal cooling system. It’s suitable for both car and truck. (freezing point：-15℃, -25℃, -35℃, -50℃).