LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE Russian patent published in 2022 - IPC C10M169/04 

FIELD: engine building.

SUBSTANCE: invention relates to a lubricating oil composition. A lubricating oil composition for internal combustion engines is described, containing a base oil composition containing base GTL oil as the main component and base oil belonging to a group II according to API classification, and having % of Cn from 14 to 25 and an aniline point in the range from 120 to 126°C, wherein the specified base oil belonging to the group II according to API classification is present in amount from 10 wt.% or more to 50 wt.% or less of the base oil composition; and a viscosity index improver based on comb-like polymethacrylate, having an average-weight molecular weight (Mw) of 400,000 or more, in amount from 2.0 to 8.0 wt.% per the total weight of the lubricating oil composition, wherein sulfur content is 0.3 wt.% or less per the total weight of the lubricating oil composition, wherein % of Cn is percentage of a naphthene carbon number of the total carbon number, determined by an annular analysis method n-d-M in accordance with ASTM D 3238-85.

EFFECT: creation of a lubricating oil composition for internal combustion engines, having a higher viscosity index and capability of preserving oil film.

4 cl, 2 tbl, 9 ex