| abstract |
[PROBLEMS] To provide a lubricating oil composition having extremely excellent base number maintenance and high temperature cleanability at high temperatures. SOLUTION: (A) An alkali metal or alkaline earth metal salicylate detergent having a metal ratio of 2.6 or less is added to a lubricating base oil in an amount of 0.005 to 1% by mass in terms of metal element, (B) Zinc dithiophosphate is 0.1 in terms of elemental sulfur. A lubricating oil composition containing not more than mass%. In addition to the above lubricating oil composition, (C) a phosphorus-containing antiwear agent is added in an amount equivalent to phosphorus element of 0. A lubricating oil composition containing 005 to 0.5% by mass. |