Patent ID: 6638897
Filing Date: 2003-10-28
Classification: C10M,C10N

Abstract:
A lubricant oil composition for internal combustion engines, comprising a base oil composed of a mineral oil, synthetic oil or mixture thereof which is treated with (A) calcium salicylate overbased with calcium carbonate and having a total base number of 30 to 350 mgKOH/g at 0.10 to 0.90 wt % ,as calcium, and (B) a succinimide selected from the group consisting of a boron-containing succinimide having a weight-average molecular weight of 3,000 or less at less than 0.03 wt %, as boron derived from the boron-containing succinimide, and a succinimide having a weight-average molecular weight of 2,500 or less at 0.01 to 0.25 wt %, as nitrogen and mixtures thereof, the above percentage being based on the whole composition.