Infineum International Limited

Richard D Bertram

Peter J Dowding

Peter D Watts

Joseph P Hartley

Stuart Briggs

Rajiv Taribagil

Robin Howard Scott

Isabella Goldmints

Bogdan Barboiu

Rajiv R Taribagil

Bogdan A Barboiu

Robin H Scott

Joseph Hartley

Concentrates of linear, block copolymers having a polymer block derived from a monoalkenyl arene, covalently linked to one or more blocks of a hydrogenated derivative of a conjugated diene copolymer, dissolved in highly saturated diluent oil, wherein the size of the monoalkenyl arene block is controlled to provide an optimized level of incompatibility of the block copolymer in the selected diluent.

Viscosity index improver concentrates for lubricating oil compositions

A lubricating oil composition comprising a Group II basestock and a neutral or overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of less than 2.

Lubricating oil composition

Trunk piston marine engine lubrication, when the engine is fueled by heavy fuel oil, is effected by a composition comprising a major amount of an oil of lubricating viscosity containing at least 50 mass % of a Group II basestock, and respective minor amounts of an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent other than such a detergent having a basicity index of less than two and a degree of carbonation of 80% or greater and 5 to 500 mass %, based on the mass of the detergent, of an oil-soluble alkyl-substituted phenol other than a hindered phenol. Asphaltene precipitation in the lubricant, caused by the presence of contaminant heavy fuel oil, is prevented or inhibited.

Marine engine lubrication

A detergent including one or more neutral or overbased alkaline earth metal Cto Chydrocarbyl substituted hydroxybenzoates, in which:

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A method of reducing asphaltene precipitation or 'black paint' in an engine is disclosed. The method includes the step of lubricating the engine with a lubricating oil composition comprising: an oil of lubricating viscosity in a major amount; and, a salicylate detergent system in a minor amount comprising one or more neutral or overbased alkaline earth metal Chydrocarbyl substituted salicylates.

Method of reducing asphaltene precipitation in an engine utilizing a C22 hydrocarbyl salicylate

An overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of less than 2 and a degree of carbonation of 80% or greater is disclosed. The overbased metal hydrocarbyl-substituted hydroxybenzoate detergent reduces asphaltene precipitation or 'black paint' in a marine diesel engine.

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Witney, United Kingdom

Richard D Bertram