| abstract |
When heavy fuel oil is refueled to the engine, the trunk piston marine engine lubrication comprises a large amount of lubricating viscous oil containing at least 50% by weight of Group I basestocks, and 40 to 90 mmol of calcium alkyl salicide per kg of the composition. Calcium alkyl salicylate detergent system for providing silates; And small amounts of oil soluble polyalkenyl-substituted carboxylic anhydride, wherein said or one or more polyalkenyl groups are derived from polyalkenes having a number average molecular weight of 200 to 3,000, respectively, by weight of the composition. It consists of a composition having a total base number (TBN) in the range of 20 to 60, inclusive. Precipitation of asphaltenes in lubricants caused by the presence of contaminating heavy fuel oils is prevented or inhibited. |