Engine Ice is a propylene glycol-based antifreeze and coolant. It provides boil-over protection to 254F and freeze protection to -7F. Engine Ice uses propylene glycol as the base because of its performance and environmental benefits. It is considerably less toxic than ethylene glycol found in many other antifreeze/coolants in the powersports field. The propylene glycol base, combined with additive packages that offer corrosion and wear protection, along with reverse osmosis water exceeding ASTM D3306 standards, produces a superior final product.