| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricant composition which is excellent in fuel consumption saving and low temperature viscosity, and can satisfy both of the fuel consumption saving and the low temperature viscosity at -35°C while maintaining high-temperature and high-shear viscosity. SOLUTION: The lubricant composition comprises: a lubricant base oil including a lubricant base oil component of which the urea adduct value is 4 mass% or less, the dynamic viscosity at 40°C is 25 mm<SP>2</SP>/s or less and the viscosity index is 120 or more, by 10 mass% to 100 mass% on the basis of the whole amount of the base oil; and poly(meth)acrylate type viscosity index improving agent which is represented by the general formula (1) [in the formula, R<SP>1</SP>presents hydrogen or methyl group, R<SP>2</SP>presents a linear or branched hydrocarbon group of 16C or more] and has the proportion of structural unit of 0.5 to 70 mol%, wherein the dynamic viscosity at 100°C is 4 to 12 mm<SP>2</SP>/s and the viscosity index is 140 to 300. COPYRIGHT: (C)2009,JPO&INPIT |
