LUBRICATING OIL COMPOSITIONS COMPRISING BIODIESEL FUEL AND ANTIOXIDANT

摘要

PROBLEM TO BE SOLVED: To provide lubricating oil compositions that are oxidatively stable, and use methods thereof.SOLUTION: A lubricating oil composition contaminated with at least about 0.3 mass% of a biodiesel fuel based on the total mass of the lubricating oil composition, comprises: a) a major amount of base oil of lubricating viscosity; and b) a diarylamine compound, where the amount of the diarylamine compound is at least about 0.1 mass% based on the total mass of the lubricating oil composition.