Infineum International Limited

Louise Renouf

Philip J Woodward

James Christian Dodd

Stuart A Taylor

Philip James Woodward

An additive concentrate package for a marine engine cylinder lubricant is made by mixing an oil of lubricating viscosity, a metal detergent and an oil-soluble alkoxylated alcohol.

Marine engine lubrication

Trunk piston marine engine lubrication, when the engine is fueled by heavy fuel oil, is effected by a composition of TBN in the range of 20 to 60 comprising a major amount of an oil of lubricating viscosity containing 50 mass % or more of a Group 1 basestock, and respective minor amounts of a calcium alkyl salicylate detergent system providing 40 to 90 mmol of calcium alkyl salicylate per kg of the composition, and 1 to 7 mass %, based on the mass of the composition, of an oil-soluble polyalkenyl-substituted carboxylic acid anhydride, wherein the or at least one polyalkenyl group is derived from a polyalkene having a number average molecular weight of from 200 to 3,000. Asphaltene precipitation in the lubricant, caused by the presence of contaminant heavy fuel oil, is prevented or inhibited.

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Didcot, United Kingdom

Louise Renouf