abstract |
The present invention (a) oil of lubricating viscosity; (b) an asphaltene dispersant containing a cyclic headgroup containing a nitrogen atom and at least one other heteroatom; And (c) a lubricating composition comprising an alkylphenol derived detergent, in particular a marine diesel engine lubricating composition. The invention also provides a method of using the composition in the operation of an engine, in particular a marine diesel engine. |