Excellent protection against corrosion, erosion, and cavitation, for aluminium water pumps. Heat transfer remains optimised: fully organic additives allow avoiding any formation of deposits and leave surfaces clean. The additives in COOLELF AUTO SUPRA -37°C give to the coolant: Chemical neutrality (pH 7-8.5). A reserve of alkalinity to neutralise the acids resulting from the combustion gases. Resistance to foaming (mainly instability of the foam that might form). Compatibility with hard water (maximum 40°F). No silicates, phosphates, chromates, nitrites or boron contains. COOLELF AUTO SUPRA -37°C is inert to elastomeric seals and paints.