LUBRICATING OIL COMPOSITION

摘要

A lubricating oil composition having a total base number of more than 15 m g KOH/g, as determined by ASTM D2896, and including at least 40 mass % of an o il of lubricating viscosity; at least one detergent; and at least one compound of the formula (I) and/or formula (II): (see formula I) In formula (I), each Ar independently represents an aromatic moiety having 0 to 3 substituents selected from the group consisting of alkyl, alkoxy, alkoxyalky l, aryloxy, aryloxyalkyl, hydroxy, hydroxyalkyl, halo and combinations thereof; each L i s independently a linking moiety comprising a carbon-carbon single bond or a linking group; each Y is independently -OR1" or a moiety of the formula H(O(CR1 2)n) y X-, wherein X is selected from the group consisting of (CR1'2)z, O and S; R1 and R1' are each independently selected from H, C1 to C6 alkyl and aryl; R1" is selected from C1 to C100 alkyl and aryl; z is 1 to 10; n is 0 to 10 when X is (CR1'2)z, and 2 to 10 when X is O or S; and y is 1 to 30; each a is independently 0 to 3, with the provis o that at least one Ar moiety bears at least one group Y; and m is 1 to 100. In formula (II) , each Ar' independently represents an aromatic moiety having 0 to 3 substituents selected from the group consisting of alkyl, alkoxy, alkoxyalkyl, hydroxy, hydroxyalkyl,ac yloxy, acyloxyalkyl, aryloxy, aryloxy alkyl, halo and combinations thereof; each L' is independently a linking moiety comprising a carbon-carbon single bond or a linking group; each Y' is independently a moiety of the formula Z(O(CR2 2)n')y'X'-, wherein X' is selected from the group consisting of (CR2' 2)z', O and S; R2 and R2' are each independently selected from H, C1 to C6 alkyl and aryl; z' is 1 to 10; n' is 0 to 10 when X' is (CR2'2)z', and 2 to 10 when X' is O or S; y' is 1 to 30; Z is H, an acyl group, an alkyl group or an aryl group; each a' is independently 0 to 3, wit h the proviso that at least one Ar' moiety bears at least one group Y' in which Z is not H; and m' is 1 to 100.