초록

Lubricating oil compositions exhibititing improved low temperature valve train wear performance with a lowered phosphorus content, which contain a reduced amount of a metal hydrocarbyl dithiophosphate, a molybdenum compound, a metal-free friction modifier and a phosphorus-free antioxidant.

대표청구항 ▼

1. A lubricating oil composition comprising a major amount of oil of lubricating viscosity, an oil soluble molybdenum compound in an amount providing from about 50 ppm to about 350 ppm, by mass, of molybdenum to said composition, an amount of metal hydrocarbyl dithiophosphate providing said composit

1. A lubricating oil composition comprising a major amount of oil of lubricating viscosity, an oil soluble molybdenum compound in an amount providing from about 50 ppm to about 350 ppm, by mass, of molybdenum to said composition, an amount of metal hydrocarbyl dithiophosphate providing said composition with no more than 600 ppm, by mass, of phosphorus, an effective amount of at least one metal-free friction modifier and an effective amount of at least one phosphorus-free antioxidant.