Green OEM Approved Coolant is a GENUINE GLYSANTIN G48, Original Equipment Manufacturer (OEM), Fully Licensed and Warranty Approved, Type 'A' Ethylene glycol, Anti-Freeze Anti-Boil as used in initial manufacturer factory fills. It uses a technically advanced HYBRID (HOAT - Hybrid Organic Acid Technology) based inhibitor system that is Phosphate, Amine and Nitrite free. The extended long-life inhibitor formulation prevents rust, corrosion, cavitation and degradation of the cooling system. It is available in both concentrate and premix formulations.