| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricant composition which is excellent in a wear-preventing property even on the deterioration of such a lubricant as containing soot or worn metal powder, and can sufficiently maintain the performance of an exhausted gas-post-treating device over a long period of time. SOLUTION: This lubricant composition is characterized by containing (A1) 0.005 to 0.2 mass% (molybdenum content) of at least one molybdenum-based, friction-adjusting agent selected from molybdenum dithiophosphate and molybdenum dithiocarbamate, (B) 0.01 to 0.2 mass% (as phosphorus content) of a phosphorus-containing wear-preventing agent, (C) 0.01 to 1 mass% (as metal content) of a metal-based cleaning agent containing at least (C1) a sulfonate-based cleaning agent and adjusted to a metal ratio of≥3.0, and (D) 0.01 to 0.4 mass% (as nitrogen content) of an ash-free dispersing agent having a weight-average mol.wt. of 3,000 to 20,000, on the basis of the total amount of the composition, in a lubricant base oil comprising a base oil (X) having %C<SB>P</SB>of≥70, %C<SB>A</SB>of≤1, a viscosity index of≥115, and CCS viscosity of≤3,000 mPa s at -35°C. COPYRIGHT: (C)2009,JPO&INPIT |
