HD COOL TEK is a ready to use cooling liquid, anti-corrosion and anti-freeze, based on monoethylene glycol and glycerol, using organic and Silicates technology called Lobrid Si-OAT additives technology.ADVANTAGES : Optimal protection for all engine metallic parts. High performance additives protecting against freezing, overheating, corrosion and scale. Long lasting anti-corrosion properties on all engine components thanks to the Lobrid Si-OAT technology. Reinforced aluminium protection at high temperature. Eliminates the risk of scaling and deposits in the cooling system. Avoid cavitation and increases water pump lifetime. Compatible with gaskets, hoses, and plastic components. Nitrite free / amine free / phosphate free / borate free.