Patent ID: 11912955
Assignee: AFTON CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 10:
11. A method of lubricating a hybrid gasoline-electric engine to achieve improved low temperature valve train wear pursuant to the Sequence IVB engine test of ASTM D8350, the method comprising:
lubricating a hybrid electric-gasoline engine with a lubricating oil composition having a viscosity grade according to SAE J 300 of 0W-8, 0W-12, 0W-16, or 0W-20; and
the lubricating oil composition including one or more base oils of lubricating viscosity; about 300 to about 1000 ppm molybdenum from an oil-soluble molybdenum compound; one or more metal-containing detergent providing greater than about 5 TBN to the lubricating oil composition, wherein TBN is measured using ASTM D4739; wherein the at least one of the one or more metal-containing detergent comprises an overbased magnesium detergent providing greater than about 2 TBN to the lubricating oil composition, wherein the TBN is measured using ASTM D4739; and less than about 0.2 weight percent of a polymeric pour point depressant and wherein a weight ratio of magnesium-to-molybdenum in the lubricating oil composition is about 0.8:1 or less.