| abstract |
(57) [Summary] [Problem] When combined with black dyeing treatment, there is no unevenness in color, no seizure of brownish sludge, etc., and a heat treated oil composition excellent in rust prevention performance, and in addition to the above, repeated use in addition to the above. A possible heat treated oil composition is provided. A lubricating base oil comprises (a) at least one metal compound selected from a zinc thiophosphate compound, a molybdenum thiophosphate compound, a zinc thiocarbamate compound and a molybdenum thiocarbamate compound; and (b) dihydrocarbyl polysulfide. A heat-treated oil composition containing a compound (c) a phosphate compound and a heat-treated oil composition further containing (d) an acid amide compound or an acid imide compound. |