| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition excellent in oxidation resistance and abrasion resistance, thus useful in e.g. turbo engines, by incorporating a base lubricating oil containing a hindered ester, etc., with a diarylamine, a phosphoric ester and a specific polyphenyl thioether at specified proportions. SOLUTION: This heat-resistant lubricating oil composition is obtained by incorporating a base lubricating oil, a mixture of a hindered ester such as neopentyl glycol di(n-butanoate) and a polyphenyl ether such as m- phenoxyphenoxy-m-biphenyl, with, based on the whole amount of the composition, (A) 0.01-10wt.% of a diarylamine such as diphenylamine, (B) 0.5-10wt.% of a phosphoric ester such as benzylphenyl phosphate and (C) 0.05-10wt.% of a polyphenyl thioether of the formula ((m) is 1-3) such as m-bis(phenylmercapto) benzene. |
