| abstract |
A lubricating oil composition that provides improved soot dispersion properties and at the same time acceptable shear stability. An ethylene α-olefin copolymer having a unit derived from ethylene of 66% by mass or less, at least one block derived mainly from a vinyl aromatic hydrocarbon monomer, and at least derived mainly from a diene monomer A lubricating oil composition formulated with a viscosity index (VI) improver composition comprising a combination with a linear diblock copolymer comprising one block. [Selection figure] None |