| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent or inhibit asphaltene precipitation in a lubricant composition caused by a contaminant heavy fuel oil.SOLUTION: A trunk piston marine engine lubricant comprises a major amount of (A) an oil of lubricating viscosity that comprises an oil-soluble ester basestock, or that comprises greater than 0.1 mass% and less than 90 mass% of an oil-soluble basestock and, as 50 mass% or more of the remainder of the oil of lubricating viscosity, a high saturates basestock; (B) a minor amount of a metal alkyl salicylate detergent; and (C) greater than 0.1 mass% and less than 10 mass% of an oil-soluble polyalkenyl-substituted carboxylic acid anhydride, where at least one polyalkenyl group is derived from a polyalkene having a number average molecular weight of 200 to 3000.</p> |
