abstract |
The present invention provides a lubricating oil composition that is used in a friction system between a metal coated with a DLC coating and a metal and has a low coefficient of friction and excellent wear resistance. A lubricating oil composition for use in a sliding portion between a DLC coating member and a metal member, comprising: (A) an organic Mo compound, (B) a Ca sulfonate, a Ca phenate, and a lubricating oil base oil. At least one overbased Ca salt selected from Ca salicylates is blended, and the perchloric acid method base number of the overbased Ca salt is 150 to 500 mgKOH / g. [Selection figure] None |