Engen multipurpose antifreeze is a nitrite-, amine-, silicate-, borate- and phosphate-free engine coolant concentrate based on ethylene glycol. Being a concentrate, it must be diluted with clean water before use. It provides excellent corrosion protection to all cooling system metals and alloys used in internal combustion engines as well as protection against freezing for up to one year. It is miscible with other silicate-free and silicate-containing coolants, although mixing is not recommended.