| 摘要 |
As a lubricant oil composition which has excellent NOx resistance, antioxidative properties, base value-maintaining properties and cleaning performance and can be used particularly suitably as a lubricant oil for an internal combustion engine, a lubricant oil composition is provided, in which a lubricant oil base oil comprises (A) a 2,2,6,6-tetraalkylpiperidine derivative and (B) an organic molybdenum compound and/or an organic tungsten compound. The lubricant oil composition preferably additionally contains (C) a hindered phenol-type antioxidant agent and/or an aromatic amine-type antioxidant agent or (D) at least one compound selected from the group consisting of a phosphorous compound and a metal or amine salt thereof. Also provided is a method for lubricating a sliding material while preventing the elution of copper and/or lead from the sliding material, said method being characterized in that the sliding material is brought into contact with a specific lubricant oil composition as mentioned above. |
