Method of Reducing Asphaltene Precipitation in an Engine
AssigneeInfineum International Limited
InventorsRichard D. Bertram, Peter J. Dowding, Peter D. Watts
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Abstract
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 C22 hydrocarbyl substituted salicylates.
Claims28
A method of reducing asphaltene precipitation (black paint) in an engine, the method including the step of lubricating the engine with a lubricating oil composition comprising, or made by admixing:
- (A) an oil of lubricating viscosity in a major amount;
- and
- (B) a salicylate detergent system in a minor amount comprising one or more neutral or overbased alkaline earth metal C22 hydrocarbyl substituted salicylates;
- with the proviso that the salicylate detergent system does not include an alkali metal salicylate.
Dependencies are inferred from the claim text.