| abstract |
An object of the present invention is to prevent or suppress asphaltene precipitation in a lubricating composition due to heavy oil contaminants. The trunk viston ship engine lubricant is a large amount of (A) an oil-soluble ester base stock, or more than 0.1 wt.% And less than 90 wt.% Of an oil-soluble base stock, and a lubricating viscosity. An oil of lubricating viscosity containing a high saturate base stock as a residue of 50% by weight or more in the oil, (B) a small amount of a metal alkyl salicylate detergent, and (C) more than 0.1% by weight 10 Containing less than% by weight of an oil-soluble polyalkenyl-substituted carboxylic acid anhydride, wherein the at least one polyalkenyl group is derived from a polyalkene having a number average molecular weight of 200-3000. [Selection figure] None |