The present invention provides an engine oil composition that contains a base oil containing a low amount of aromatic components and can maintain lubricity because an organic molybdenum compound barely decomposes during long-term use without containing high amounts of an antioxidant or a zinc dithiophosphate compound.
In order to achieve this, the present invention provides an internal combustion engine lubricating oil composition containing a base oil that is a hydrocarbon oil containing less than 1% by mass of aromatic components and having a sulphur content of less than 20 ppm by mass; a specific organic molybdenum compound as a component (A) at 300 to 1500 ppm by mass as molybdenum atoms; and a borate ester compound as a component (B) at 100 to 1000 ppm by mass as boron atoms.
本发明提供了一种发动机油组合物,该组合物含有一种芳香族成分含量较低的基础油,并且由于有机
钼化合物在长期使用过程中几乎不会分解,因此能够保持润滑性,同时不含大量
抗氧化剂或
二硫代磷酸锌化合物。
为此,本发明提供了一种内燃机润滑油组合物,其中包含一种基础油,该基础油是一种芳香族成分含量小于 1%(质量分数)且
硫含量小于 20 ppm(质量分数)的烃类油;一种特定的有机
钼化合物,作为组分(A),
钼原子含量为 300 至 1500 ppm(质量分数);以及一种
硼酸酯化合物,作为组分(B),
硼原子含量为 100 至 1000 ppm(质量分数)。