LUBRICANT OIL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a lubrication oil composition for an internal combustion engine reducing a frictional coefficient without deteriorating heat-oxidation stability and improving cleanliness.SOLUTION: Provided is a lubrication oil composition for an internal combustion engine in the components of a) to e): a) a lubrication base oil with a kinematic viscosity (100°C) of 2 to 12 mm/s by independently using or plurally combining API group 2 or 3 base oil having a viscosity index of 95 or more, a sulfur content of 0.03 mass% or lower and %C1 or lower; b) a nitrogen-containing ashless dispersant in which the value in terms of a nitrogen content is 0.01 to 0.3 mass%; c) a metal containing calcium and/or magnesium, in which the value in terms of an alkaline earth metal content is 0.05 to 0.3 mass%; d) zinc dialkyldithiophosphate in which the value in terms of a phosphorous content is 0.05 to 0.13 mass%; and e) a specified oil soluble semi-polar organic boron glycerin ester compound in which the value in terms of a boron content is 0.015 to 0.030 mass%.SELECTED DRAWING: None