Abstract: The IC Engine used oil coolant, its NO_x emission is more than water cooling engines, since tempurature of the combustion chamber is increased. With internal cooling of water was employed in the engine, the NO_x emission as well as is reduced. To add GDS-2 additive to oil coolant, the freezing-point decreaced from-12℃ to-42℃. The method of the oil cooling finds wide use in the coid area.