LUBRICATING OIL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a lubricating oil composition which gives an improved soot dispersion property and simultaneously gives an acceptable shear stability. SOLUTION: The lubricating oil composition contains a viscosity index (VI) improver composition which contains a combination of an ethylene-α-olefin copolymer having at most 66 mass% units derived from ethylene and a linear diblock copolymer containing at least one block mainly derived from a vinyl aromatic hydrocarbon monomer and at least one block mainly derived from a diene monomer. COPYRIGHT: (C)2007,JPO&INPIT