LUBING COMPOSITION FOR INTERNAL COMBUSTION ENGINE Russian patent published in 2012 - IPC C10M141/08 C10M135/26 C10M133/16 C10N20/04 C10N30/06 C10N40/25 

FIELD: engines and pumps.

SUBSTANCE: proposed composition comprises basic oil, disulfide compound as component A in amount of 0.01 to 0.5 wt % in terms of sulfur, ash-free dispersant not containing boron as component B, and boron-bearing ash-free dispersant as component C. Component A is represented by formula R¹OOC-A¹-S-S-A²-COOR² (1) and/or formula R⁷OOC-CR⁹R¹⁰-CR¹¹(COOR⁸)-S-S-CR¹⁶(COOR¹³)-CR¹⁴R¹⁵-COOR¹² (2). Side chain of component B has alkyl group with average molecular weight of 500 to 3000, or olefin group with average molecular weight of 500 to 3000. Nitrogen content caused by component B makes 50 to 4000 ppm. Side chain of component C has alkyl group with average molecular weight of 500 to 4000, or olefin group with average molecular weight of 500 to 4000. Component B represents, at least, one compound of alkyl succinimide, olefin succinimide, aliphatic amide, alkyl benzylamine and olefin benzylamine.

EFFECT: increased oil replacement interval, higher wear resistance.

1 tbl, 7 ex