| 摘要 |
A low SAPS lubricating oil composition having up to 0.3 wt.% sulphur, up to 0.08 wt.% phosphorus, and a sulphated ash content up to 0.80 wt.% comprising at least one nitrogen-containing dispersant, the dispersant providing to the oil a nitrogen content of at least 0.075 wt.% nitrogen, the dispersant having a polyalkenyl backbone, which has a number average molecular weight range of about 900 to 3000; and an oil soluble or oil dispersible source of boron, which is a boron containing dispersant, present in an amount so as to provide a ratio of wt% nitrogen to wt% boron in the oil composition of about 3:1 to 5:1. These dispersants are in admixture with a major amount of an oil of lubricating viscosity.
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