FIELD: chemistry.
SUBSTANCE: present invention relates to a lubricating oil composition containing base oil and as component (a) from 0.5 to 1.5 wt% of mono- or diester of glycerol and straight-chain or branched fatty acid with 6 to 20 carbon atoms, having saturated hydrocarbyl group; as component (b) 0.1–0.5 wt% triazole derivative of general formula (1), where R1 represents hydrogen or hydrocarbyl group with 1–3 carbon atoms, R2 and R3 respectively independently represent hydrogen or hydrocarbyl group with 1–20 carbon atoms; and component (c) from 0.01 to 0.2 wt% in terms of phosphorus mixture of primary zinc dialkyldithiophosphate, alkyl group of which is a primary hydrocarbyl group, and secondary zinc dialkyldithiophosphate, alkyl group which is a secondary hydrocarbyl group; wherein ratio of component (a)/component (b) ranges from 1.5 to 8.
EFFECT: obtaining a lubricating oil, corresponding to environmental standards, as well as with improved effect of reducing friction and corrosion protection effect, with low content of ash, phosphorus and sulphur.
16 cl, 3 tbl
(1)
