Lubricating oil compositions
AssigneeInfineum International Limited
InventorsAnthony J. Strong, Philip J. Woodward
Life of this patent
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Abstract
A lubricating oil composition having a sulphated ash content of less than or equal to 1.2 mass % as determined by ASTM D874 and a phosphorous content of less than or equal to 0.12 mass % as determined by ASTM D5185, which lubricating oil composition comprises or is made by admixing: an oil of lubricating viscosity, in a major amount; an oil-soluble or oil-dispersible polymeric friction modifier as an additive in an effective minor amount; and, an oil-soluble or oil-dispersible dihydrocarbyl dithiophosphate metal salt as an additive in an effective minor amount.
Claims15
A lubricating oil composition having a sulphated ash content of less than or equal to 1.2 mass % as determined by ASTM D874 and a phosphorous content of less than or equal to 0.12 mass % as determined by ASTM D5185, which lubricating oil composition comprises or is made by admixing:
- (A) an oil of lubricating viscosity, in a major amount;
- (B) an oil-soluble or oil-dispersible polymeric friction modifier as an additive in an effective minor amount, the polymeric friction modifier being the reaction product of solely:
- (i) a functionalised polyolefin;
- (ii) a polyalkylene glycol;
- (iii) a polyol;
- and,
- (iv) a polycarboxylic acid;
- and,
- (C) at least one oil-soluble or oil-dispersible dihydrocarbyl dithiophosphate metal salt as an additive in an effective minor amount.
Dependencies are inferred from the claim text.