Marine engine lubrication
AssigneeInfineum International Limited
InventorLaura Gregory
Life of this patent
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Abstract
A trunk piston marine engine lubricating oil composition for a medium-speed compression-ignited marine engine comprises, in a major amount, an oil of lubricating viscosity containing 50 mass % or more of a Group II basestock, and, in respective minor amounts, (A) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of 5.5 or greater, and (B) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of 2 or less. The ratio of the mass of metal in detergent (A) to the mass of metal in detergent (B) is 10 or less.
Claims7
A trunk piston marine engine lubricating oil composition for a medium-speed compression-ignited marine engine comprising, or made by admixing, an oil of lubricating viscosity, in a major amount, containing 50 mass % or more of a Group II basestock, and, in respective minor amounts,
- (A) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of 5.5 or greater;
- and
- (B) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of 2 or less,
- wherein the ratio of the mass of metal in detergent (A) to the mass of metal in detergent (B) is 10 or less;
- the trunk piston marine engine lubricating oil composition having a TBN (using ASTM D2896) of 20 to 60.
Dependencies are inferred from the claim text.