Molybdenum, sulfur and boron containing lubricating oil composition

A lubricating oil composition, comprising:

• (A) a base oil;
• (B) a molybdenum and sulfur containing composition derived from a basic nitrogen containing compound, a molybdenum compound and carbon disulfide;
• (C) a boron-containing compound selected from the group consisting of:
• (C-I) a borated ester represented by one or more of the formulae
• 10
• wherein in formulae (C-I-1), (C-I-2) and (C-I-3), each R is independently a hydrocarbon group and any two adjacent R groups may together form a cyclic group;
• (C-II) at least one borated epoxide comprising the product made by reacting a boron reactant with one or more epoxides represented by the formula
• 11
• wherein in formula (C-II-1) each R is independently hydrogen or a hydrocarbon group and any two adjacent R groups may together form a cyclic group, with the proviso that when a single epoxide is used the total number of carbon atoms in the R groups does not exceed about 12, and when a mixture of epoxides is used the average on a mole basis for the total number of carbon atoms in the R groups for the mixture does not exceed about 12;
• and
• (C-III) mixture of (C-I) and (C-II);
• and
• (D) optionally a phosphorus containing compound, provided the phosphorus content of the lubricating oil composition does not exceed about 0.10% by weight.