| abstract |
(57) [Summary] [Purpose] Developed a lubricating oil composition that has excellent oxidation stability and at the same time excellent sludge formation prevention properties, and can be applied to equipment where oxidation stability at high temperatures is important. To do. [Composition] Lubricating base oil (A) based on the total amount of the composition 0.3-3.0% by weight of p-branched alkylphenyl-α-naphthylamine represented by the following general formula (I) And (B) phenyl-α-naphthylamine 0.05 to 1.0% by weight, and the weight ratio of the contents of the component (A) and the component (B) is 3: 1 to 20: 1. [Chemical 1] |