FIELD: chemistry.
SUBSTANCE: invention can be used in internal combustion engines such as petrol engines, diesel engines and gas engines. The combination for improving oxidation resistance contains: (A) at least one compound selected from disulphide compounds of general formula (I): R1OOC-A1-S-S-A2COOR2 (I), and disulphide compounds of general formula (II): R7OOC-CR9R10-CR11(COOR8)-S-S-CR16(COOR13)-CR14R15-COOR12 (II), (B) an organic molybdenum-containing compound, and (C) a phenol antioxidant and/or an amine-based antioxidant. The lubricating oil composition contains base oil and a combination for improving oxidation resistance with molybdenum content less than or equal to 2000 ppm. Sulphur content of the composition is less than or equal to 0.3% and sulphate ash content is less or equal to 1%.
EFFECT: improved oxidation resistance while simultaneously reducing friction and meeting environmental regulations.
7 cl, 2 tbl, 8 ex
