LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES Russian patent published in 2019 - IPC C10M139/00 

FIELD: machine building.

SUBSTANCE: invention describes a lubricant oil composition for internal combustion engines comprising the following components: (a) lubricating oil base oil having kinematic viscosity at 100 ºC from 2 to 12 mm²/s, which is one group 2 or group 3 base oil according to API, having a viscosity index of 95 or higher, a sulfur content of 0.03 wt% or lower and a value of %CA is 1 or lower, or a combination thereof, (b) nitrogen-containing ash-free dispersing agent in amount of 0.01–0.3 wt% in terms of nitrogen content of total amount of composition, (c) a metal-containing detergent which contains calcium and/or magnesium as an alkali-earth metal in amount of 0.05–0.3 wt% in terms of the content of the alkali-earth metal of the total amount of the composition,

(d) zinc dialkyldithiophosphate in amount of 0.05–0.13 wt% in terms of phosphorus content of total amount of composition and (e) an oil-soluble semipolar organic compound, which is a boric acid ester of glycerol represented by chemical formula (1), where R denotes a straight-chain or branched alkyl group or a straight-chain or branched alkenyl group containing 7–20 carbon atoms in amount of 0.015–-0.040 wt% in terms of boron content of the total amount of the composition.

(1).

EFFECT: obtaining a lubricating oil composition having a low friction coefficient and good cleaning properties at high temperatures.

5 cl, 2 tbl