Lubricating oil compositions comprising a biodiesel fuel and a detergent
AssigneeChevron Oronite Company LLC
InventorAlexander B. Boffa
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Abstract
This invention encompasses lubricating oil compositions comprising a base oil, a biodiesel fuel and a detergent. The detergent can be a metal phenate detergent such as alkaline metal phenates. The lubricating oil compositions can further comprise at least one antiwear agent such as zinc dialkyl dithiophosphate compounds. Methods of making and using the lubricating oil compositions are also described.
Claims22
A lubricating oil composition contaminated with at least about 0.3 wt % of a biodiesel fuel or a decomposition product thereof, based on the total weight of the lubricating oil composition, comprising:
- (a) a major amount of a base oil of lubricating viscosity;
- and
- (b) a calcium metal phenate
- wherein the amount of the calcium from the calcium metal phenate present in the lubricating oil composition is at least about 1000 ppm.
A method of lubricating a diesel engine fueled at least in part with a biodiesel fuel which comprises operating the engine with a lubricating oil composition contaminated with at least about 0.3 wt % of a biodiesel fuel or a decomposition product thereof, based on the total weight of the lubricating oil composition, wherein the lubricating oil composition comprises:
- (a) a major amount of a base oil of lubricating viscosity;
- and
- (b) a calcium metal phenate,
- wherein the amount of the calcium from the calcium metal phenate present in the lubricating oil composition is at least about 1000 ppm.
Dependencies are inferred from the claim text.