| 摘要 |
An internal combustion engine crankcase lubricating oil composition has a phosphorus content of not greater than 0.09 mass %, a metal detergent additive system comprising one or more metal salts of organic carboxylic acids, and a viscosity index improver comprising a linear diblock copolymer, one block being derived from a vinyl aromatic hydrocarbon monomer and one block being derived from a diene monomer.
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