Patent ID: 7981846

Claim:
A lubricating oil composition comprising: (A) a major amount of an oil of lubricating viscosity; and (B) a borated alkaline earth metal sulfonate detergent prepared by a process comprising (a) reacting (i) at least one of an oil soluble sulfonic acid, an alkaline earth sulfonate salt, or a mixture thereof; (ii) at least one source of alkaline earth metal; (iii) at least one source of boron, in the presence of (iv) at least one hydrocarbon solvent; and (v) from 0 to less than 10 mole percent, relative to the source of boron, of an overbasing acid, other than the source of boron; and (b) heating the reaction product of (a) to a temperature that is above the distillation temperature of (iv) to distill (iv) and the water generated in the reaction; wherein the lubricating oil composition comprises no more than 0.12 wt % phosphorus.