A lubricating oil composition comprising:
(1) 98.6 to 53% by weight of a base oil having a kinematic viscosity of 3 to 20 centistokes as determined at 100°C;
(2) 0.2 to 5% by weight of a sulfurized oxymetal organo-phosphorodithioate represented by the formula (I):
and/or sulfurized oxymetal dithiocarbamate represented by the formula (II):
(3) 0.1 to 7% by weight of at least one zinc dithiophosphate represented by the formula (III):
(4) 0.1 to 20% by weight of a calcium alkylbenzenesulfonate and/or a calcium petroleumsulfonate; and (5) 1 to 15% by weight of alkenylsuccinic acid imide and/or boron derivatives thereof. The present lubricating oil composition is superior in reducing the mechanical friction loss or four-cycle engines, particularly small-sized high power four-cycle engines when used as an engine oil.
一种润滑油组合物,包括
(1) 以重量计,98.6%至 53%的基础油,其运动粘度在 100°C 时为 3 至 20 厘沱;
(2) 0.2%至 5%(按重量计)由式(I)代表的
硫化氧
金属有机
二硫代磷酸酯:
和/或由式(II)代表的
硫化氧
金属二
硫代
氨基甲酸酯:
(3) 至少一种由式(III)代表的
二硫代磷酸锌 0.1-7%(重量):
(4) 0.1%至 20%(按重量计)的烷基
苯磺酸钙和/或石油
磺酸钙;以及 (5) 1%至 15%(按重量计)的烯基
琥珀酸亚胺和/或其
硼衍
生物。本润滑油组合物作为发动机油使用时,在减少机械摩擦损失或四循环发动机,特别是小型大功率四循环发动机方面具有优越性。