| 摘要 |
The present invention provides a lubricating oil composition, which is capable to maintain sufficient low-friction (i.e. fuel saving performance) even when the lubricating oil is contaminated with soot and metal abrasion powder, which is excellent in durability with regard to anti-wear property and detergency, as well as oxidation stability, and which is capable to lower the ash content and to sufficiently maintain the performance of exhaust-gas after-treatment device for a long term. The lubricating oil composition comprises a lubricant base oil containing a base oil (X) of which % C<SUB>P </SUB>is 70 or more, % C<SUB>A </SUB>is 1 or less, viscosity index is 115 or more, and CCS viscosity at -35° C. is 3000 mPa.s or less, wherein the lubricant base oil, to total mass of the composition, contains following components (A)~(D): (A) 0.01~10 mass % of ashless friction modifier; (B) 0.01~0.2 mass % of phosphorus-containing anti-wear agent as phosphorous content; (C) 0.01~1 mass % of metallic detergent as metal content; and (D) 0.01~0.4 mass % of ashless dispersant having 3000~20000 of weight-average molecular weight as nitrogen content.
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