| 摘要 |
Phosphite-free lubricating oil composition which comprises a) a mineral oil or a synthetic oil or a mixture thereof, and b) a mixture containing at least one aromatic amine of the formula (I), <IMAGE> (I) in which R1, R2, R3 and R3' are as defined in claim 1, and at least one phenol of the formula <IMAGE> (II) in which R4, R5 and A are as defined in claim 1, and the compounds are present in the mixture in a ratio of 2 to 6 parts by weight of the aromatic amine(s) of the formula I to 1 part by weight of the phenol(s) of the formula II. The lubricating oil compositions are highly resistant to ageing and are effective in preventing black sludge formation. |
