The coolant is used in the cooling systems of automotive internal combustion engines. It is solution of water and ethylene-glycol with the unique organic additive package which eliminate aggressiveness of the ethylene-glycol to metals and rubber gaskets, ensuring longevity of the automotive cooling system. It guarantees reliable anti-corrosive protection of metals and alloys, inactivity to rubber, neoprene and ceramic parts. It prevents scaling. Alkalinity is less than 10 cm3. The freezing point is not higher than -40°C.