| abstract |
A gas-fuelled engine lubricating oil composition having 0.01 to 1.3 % of sulfated ash,nwhich comprises or is made by admixing:n (i) a major amount of oil of lubricating viscosity; (ii) a minor amount of a detergent composition consisting essentially of at leastnone calcium salicylate, wherein the or each salicylate has a TBN in thenrange from 70 to 245 (iii) 0 to 0.2 mass % of nitrogen, based on the mass of the oil composition, of andispersant; and (iv) a minor amount of one or more co-additives nwith the proviso that the oil composition does not contain an anti-oxidant additive. |