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
| JP2004099900A | 2004-04-02 | |||
| JP2004107645A | 2004-04-08 | |||
| JPH09111275A | 1997-04-28 | |||
| JP2001107074A | 2001-04-17 |
Fumiaki Otsuka
Sadao Kumakura
Nobuo Ogawa
Takayoshi Nishijima
Atsushi Hakoda