LIQUID COOLANT COMPOSITION FOR INTERNAL COMBUSTION ENGINES AND OPERATING METHOD FOR INTERNAL COMBUSTION ENGINES

摘要

This invention provides a coolant composition for an internal combustion engine that can improve the energy efficiency of an internal combustion engine and a method for operating an internal combustion engine using such coolant composition. The coolant composition for an internal combustion engine of the invention has kinematic viscosity of 8.5 to 3,000 mm 2 /sec at 25°C and 0.3 to 1.3 mm 2 /sec at 100°C. The method for operating an internal combustion engine of the invention is carried out with the use of such composition.