Lubricating oil composition for hybrid vehicles

A method for reducing corrosion and/or rust in a hybrid engine, said method comprising lubricating and operating a hybrid engine with a lubricating oil composition comprising:

• a. a major amount of an oil of lubricating viscosity;
• b. one or more compounds containing a carboxylic-acid functional group, ester functional group, or anhydride functional group represented by formula (I) or (II),
• where each R1, R2, R3, and R4 is independently a hydrogen radical, hydrocarbyl radical, or hydrocarbylene radical, each R5 and R6 is independently a hydrogen radical, hydrocarbyl radical, or hydrocarbylene radical, where at least one of R1, R2, R3, and R4 is a hydrocarbyl or hydrocarbylene radical;
• and
• c. a polyalkoxylated hydrocarbyl phenol represented by formula (III) or (IV):
• where each R7 is independently a hydrocarbyl or hydrocarbylene radical of 1 to 250 carbon atoms, each R8 and R9 is independently a hydrogen radical, hydrocarbyl radical of 1 to 6 carbon atoms, or hydrocarbylene radical of 1 to 6 carbon atoms;
• R10 is a hydrogen radical, hydrocarbyl radical of 1 to 24 carbon atoms, hydrocarbylene radical of 1 to 24 carbon atoms, or acyl radical represented by —C(═O)R11, R11 is a hydrocarbyl or hydrocarbylene radical of 1 to 24 carbon atoms, R12 and R13 are independently a hydrogen radical, hydrocarbyl radical of 1 to 24 carbon atoms, or hydrocarbylene radical of 1 to 24 carbon atoms, n is 1 to 3, m is 1 to 50, and p is 1 to 50.