Patent ID: 6511947
Filing Date: 2003-01-28
Classification: C10M,C10N

Abstract:
A lubricating oil composition comprising:(a) a base oil consisting of a composition selected from: (i) a mixture of a polyphenyl ether having 4-5 aromatic rings and/or its hydrocarbon substituted group with a polyphenyl thioether having 3-5 aromatic rings represented by the following general formula [I] or (ii) a polyphenyl thioether having 3-5 aromatic rings represented by the following general formula [I]wherein R1, R2 and R3, which may be the same or different, each represents hydrogen atom or a hydrocarbon group having 1-24 carbon atoms, x, y and z, which may be the same or different, each represents an integer of 1-4, and m represents an integer of 1-3; (b) an amine antioxidant: 0.1-0.8 mass %, on the basis of the total mass of the lubricating oil composition; (c) a phosphate: 2-3 mass %; and (d) an amine salt of acid phosphate: 0.07-0.15 mass %.