To provide a lubricating oil composition that enhances lubricating performance in a diesel engine equipped with an exhausted gas recirculation (EGR) apparatus.
The lubricating oil composition includes a large amount of an oil having a lubricating viscosity, a small amount of at least one high-molecular weight polymer comprising (i) a copolymer of a hydrogenated polymer of a monovinyl aromatic hydrocarbon and a conjugated diene polymer where the portion of the hydrogenated polymer of the monovinyl aromatic hydrocarbon accounts for at least 20 mass% of the copolymer, (ii) an olefin copolymer bearing an alkyl or aryl amine or amide group, a nitrogen-containing heterocyclic group or an ester bond and/or (iii) a derivative of an acrylate or alkyl acrylate copolymer bearing a dispersant group, and a small amount of at least one neutral and/or overbasic metal-containing cleaning agent selected from among a phenate/salicylate mixed cleaning agent, a phenate cleaning agent containing no sulfur and a mixture thereof.
Bansal, Jai G.
Emert, Jacob
Fetterman, Glen P.
Gutierrez, Antonio
Irving, Matthew D.
Locke, Christopher J.
Minotti, Michael T.
