The present invention provides a lubricating oil composition comprising a lube base oil comprising a mineral oil and/or a synthetic oil; (A) an alkenylsuccinimide or an alkylsuccinimide and/or a boron-containing derivative thereof in an amount of 0.01 to 0.14 % by mass based on the composition in terms of the nitrogen content as an ashless dispersant, wherein an alkenylsuccic acid monoimide or an alkylsuccinic acid monoimide and/or a boron-containing derivative thereof in the ashless dispersant is 0.05 % by mass or less in terms of nitrogen content; and (B) a dialkyldiphenylamine compound in an amount of 0.3 to 5.0 % by mass and a hindered phenol compound in an amount of 0 to 2.5 % by mass based on the composition as an antioxidant, and (C) a sulfated ash of the lubricating oil composition is 1.2 % by mass or less.
The lubricating oil composition suitable for internal combustion engines has excellent oxidation stability despite low ash content, exhibits small increase in viscosity and acid number, and can prolong the interval (distance or time) required for changing lubricating oil.
本发明提供了一种润滑油组合物,该组合物包含由矿物油和/或合成油组成的润滑油基础油;(A) 烷基琥珀
酰亚胺或烷基琥珀
酰亚胺和/或其含
硼衍
生物,作为无灰分散剂,其用量为组合物中氮含量的 0.(A) 烷基琥珀
酰亚胺或烷基琥珀
酰亚胺和/或其含
硼衍
生物,以氮含量计,其质量百分比为 0.01 至 0.14%,作为无灰分散剂,其中烷基
琥珀酸单
亚胺或烷基
琥珀酸单
亚胺和/或其含
硼衍
生物在无灰分散剂中的质量百分比为 0.(B) 作为
抗氧化剂的二烷基
二苯胺化合物的质量分数为 0.3 至 5.0 %,受阻
酚化合物的质量分数为 0 至 2.5 %,以及 (C) 润滑油组合物的
硫酸盐灰分的质量分数为 1.2 % 或以下。
适用于内燃机的润滑油组合物尽管灰分含量低,但却具有极佳的氧化稳定性,粘度和酸数的增加很小,并能延长更换润滑油所需的间隔(距离或时间)。