Mobil Coolant Extra is a 50:50 mixture of Glysantin G48 and water. For the preparation of the mixture demineralized water with low electrical conductivity is used, in order to maximize corrosion protection and to minimize hard water scale deposits in the cooling system. Mobil Coolant Extra provides frost protection down to -36ºC. Mobil Coolant Extra was developed to protect engines against corrosion, overheating and frost damage. It gives a high degree of corrosion protection to engine components such as radiators, cylinder blocks/heads, water pumps and heat exchangers, and avoids deposits.