Fuel costs can exceed 50 percent of the total diesel plant’s operational expenditures. To reduce fuel costs, medium-speed engines are now available with improved fuel consumption and ability to burn residual fuels. Part II of this paper reviews characteristics of lubricants suitable for use with distillate, residual, and blended fiels in medium-speed engines. Examples are shown of how lubricants and their additives control engine wear, deposits, and oxidation, and how fuel consumption is affected by viscosity. Control of insolubles and the purification of used lubricants are discussed.

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