Features & Benefits Concentrated SI-HOAT coolant based on ethylene glycol for year-round cooling system protection. Provides excellent antifreeze protection while helping protect metals and alloys against corrosion. Suitable for compatible petrol and diesel engines using cast iron, aluminium or combinations of both materials. Compatible with cooling systems containing aluminium and copper alloys. Good compatibility with commonly used cooling system elastomers and plastics. Nitrite, phosphate and amine-free formulation. High chemical stability with a recommended service duration of up to 3 years. Concentrated formula allows the coolant/water ratio to be adjusted for the required level of frost protection. Mixing & Protection 1/3 Motorex M5.0 + 2/3 water: Protection down to appr.