FIELD: chemistry.
SUBSTANCE: present invention relates to a lubricant composition, that is a lubricant composition having very good oxidation stability. Lubricating composition according to this invention contains (in terms of 100 wt. % of total lubricating composition): from 0.5 to 30 wt. % of liquid olefin copolymer, from 0.1 to 3.0 wt. % of phosphorothioate compound, from 0.05 to 3.0 wt. % of phosphonium phosphate, having structural formula given below, and up to 100 % of base oil.
EFFECT: invention has improved frictional characteristics even in heavy conditions of high temperature and high pressure and, thus, suitable for use in hydraulic oil.
8 cl, 7 tbl
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