| 摘要 |
PURPOSE:To obtain a lubricating oil composition which, when contaminated with solid impurities such as soot, can be effectively cleaned and can, therefore, suppress the abrasion of a valve mechanism by mixing a base oil with specified amounts of calcium phenate, magnesium sulfonate and alkenyl-succinimide. CONSTITUTION:A lubricating oil composition prepared by mixing a base oil with 1-7wt.% calcium phenate of base value of 60mgKOH/g or above, 0.1-5wt.% magnesium sulfonate of base value of 100mgKOH/g or above and 1-5wt.% alkenyl-succinimide is used as a lubricating oil for a diesel engine. If this composition is contaminated with solid impurities, these impurities are agglomerated during engine run, and the agglomerates are removed through a by-pass filter provided in the lubricating oil circulation system. |
