The lubricating oil composition of the present invention comprises at least one species of aromatic constituent selected from the following (a1) to (a5):
(a1) a lubricating base oil comprising a polycyclic aromatic content of 0.01 % by mass or more based on the total amount of base oil
(a2) a lubricating base oil comprising a total aromatic content of 20 to 100 % by mass based on the total amount of base oil
(a3) an aromatic solvent
(a4) at least one species of polycyclic aromatic compound selected from alkyl naphthalene and compounds having three or more aromatic rings, and
(a5) an aromatic compound having a nitrogen atom, an oxygen atom or a sulfur atom;
and an organic molybdenum compound.
本发明的润滑油组合物包含至少一种选自以下(a1)至(a5)的芳香族成分:
(a1) 润滑油基础油,其多环
芳烃含量为基础油总量的 0.01%(质量百分比)或更 高
(a2) 总
芳烃含量为 20%至 100%(以基础油总量计)的润滑基础油
(a3) 一种芳香族溶剂
(a4) 至少一种多环
芳烃化合物,选自烷基
萘和具有三个或三个以上芳香环的化合物, 以及
(a5) 具有一个氮原子、一个氧原子或一个
硫原子的芳香族化合物;
和一种有机
钼化合物。