Lubricating oil compositions
AssigneeInfineum International Limited
InventorsRobert Robson, Roger W. Glyde, Alisdair J. Brown, Simon S. M. Chung, Stephen Arrowsmith
Life of this patent
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Abstract
A crankcase lubricating oil composition comprises an oil of lubricating viscosity, in a major amount, and, in respective minor amounts, a boron-containing additive and one or more co-additives, wherein the lubricating oil composition has greater than 200 ppm by mass of boron, less than 600 ppm by mass of phosphorus and less than 4000 ppm by mass of sulfur, based on the mass of the oil composition. Such compositions demonstrate provide improved wear performance.
Claims24
A crankcase lubricating oil composition comprising, or made by admixing, an oil of lubricating viscosity, in a major amount, and, in respective minor amounts, a boron-containing additive and one or more co-additives, wherein the lubricating oil composition has greater than 200 ppm by mass of boron, less than 600 ppm by mass of phosphorus and less than 4000 ppm by mass of sulfur, based on the mass of the oil composition.
A crankcase lubricating oil composition comprising, or made by admixing, an oil of lubricating viscosity, in a major amount, and, in respective minor amounts, a boron-containing additive and one or more co-additives, wherein the lubricating oil composition has greater than 300 ppm by mass of boron, less than 900 ppm by mass of phosphorus and less than 4000 ppm by mass of sulfur, based on the mass of the oil composition.
A crankcase lubricating oil composition comprising, or made by admixing, an oil of lubricating viscosity, in a major amount, and, in respective minor amounts, a boron-containing additive, a detergent additive composition and one or more co-additives, wherein the lubricating oil composition has greater than 150 ppm by mass of boron, less than 800 ppm by mass of phosphorus and less than 4000 ppm by mass of sulfur, based on the mass of the oil composition, provided that the detergent additive composition comprises at least two detergents of at least two metals.
A method for conferring wear resistance to a crankcase lubricating oil composition that contains less than 900 ppm by mass of phosphorus and less than 6000 ppm by mass of sulfur, based on the mass of the oil composition, by provision in the composition of a boron-containing additive to provide greater than 50 ppm by mass of boron based on the mass of the composition.
Dependencies are inferred from the claim text.