Lubricating oil compositions
AssigneeInfineum International Limited
InventorsAdrian Dunn, Laurent Chambard, Terence Garner
Life of this patent
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Abstract
A lubricating oil composition suitable for a trunk piston marine diesel engine. The lubricating oil composition comprises an admixture of: (A) an oil of lubricating viscosity, in a major amount; and (B) an oil-soluble complex overbased metal detergent additive, in a minor amount. The composition is substantially dispersant-free or contains 1, or less than 1, preferably less than 0.5, mass % based on the mass of the compositions, of a dispersant. The composition has a TBN in the range of 3.5 to 100, preferably 8 to 100.
Claims8
A lubricating oil composition for a 4-stroke trunk piston medium speed compression-ignited marine engine, comprising an admixture of:
- (A) an oil of lubricating viscosity, in a major amount;
- and
- (B) an oil-soluble overbased metal detergent additive, in a minor amount, in the form of a complex wherein the basic material of the detergent is stabilised by more than one surfactant;
- the composition containing less than 1 mass %, based on the mass of the composition, of a dispersant;
- and the composition having a TBN in the range of 8 to 100.
Dependencies are inferred from the claim text.