Gas-fuelled engine lubricating oil compositions
AssigneeInfineum International Limited
InventorsKeith Strickland, Laurent Chambard
Life of this patent
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Abstract
A gas-fuelled engine lubricating oil composition that is substantially free from anti-oxidant additives. The gas-fuelled engine lubricating oil composition exhibits good resistance to oil oxidation and nitration and improved corrosion resistance. The composition includes: (i) an oil of lubricating viscosity; (ii) a detergent composition including at least one calcium salicylate having a TBN in the range from 70 to 245; (iii) 0 to 0.2 mass % of nitrogen, based on the mass of the oil composition, of a dispersant; and (iv) a minor amount of one or more co-additives.
Claims14
A gas-fuelled engine lubricating oil composition including from 0.01 to 1.3% of sulfated ash according to ASTM D-874, which comprises or is made by admixing:
- (i) a major amount of oil of lubricating viscosity;
- (ii) a minor amount of a detergent composition comprising at least one calcium salicylate having a total base number (TBN) in the range from 70 to 245 according ASTM D-2896;
- (iii) 0 to 0.2 mass % of nitrogen, based on the mass of the oil composition, of a dispersant;
- and
- (iv) a minor amount of one or more co-additives;
- with the proviso that the oil composition is substantially free of an anti-oxidant additive.
A concentrate for a gas-fuelled engine lubricating oil composition, the concentrate being substantially free from an anti-oxidant additive and comprising:
- (ii) more than 40 mass %, preferably a major amount, of a detergent composition comprising at least one calcium salicylate having a TBN in the range from 70 to 245 according to ASTM D-2896;
- (iii) 0 to 0.5 mass % of nitrogen, based on the mass of the oil composition, of a dispersant;
- and
- (iv) a minor amount of one or more co-additives.
Dependencies are inferred from the claim text.