Patent ID: 6613724
Filing Date: 2003-09-02
Classification: C10M,C10N

Abstract:
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.