Patent ID: 6048826
Filing Date: 2000-04-11
Classification: C10M,C10N

Abstract:
A lubricating oil composition, which comprises a base oil containing a viscosity index improver, and additives of (A) from 0.05 to 1% by weight, relative to the total weight of the composition, of a dithiocarbamate compound and (B) from 0.05 to 2% by weight, relative to the total weight of the composition, of a condensate of a branched chain fatty acid having from 8 to 30 carbon atoms and an amine selected from the group consisting of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethyleneheptamine, heptaethyleneoctamine, dipropylenetriamine, tetrapropylenepentamine, hexabutyleneheptamine, monoethanolamine and diethanolamine, and wherein said base oil combined with a viscosity index improver and has a viscosity index of not lower than 160, and wherein said composition has an initial .mu.1/.mu.50 ratio of less than 1.0 according to JASO M349-95, wherein .mu.1 is the coefficient of friction at a sliding velocity of 0.006 m/sec, and .mu.50 is the coefficient of friction at a sliding velocity of 0.030 m/sec, and wherein upon aging said composition in accordance with JIS K2514, the time within which said ratio reaches larger than 1.0 according to said JASO M349-95 is at least 192 minutes.