| 摘要 |
A lubricating oil composition comprises a major amount of an oil of lubricating viscosity and a minor amount of an additive combination comprising an ashless dispersant having a polymeric hydrocarbon backbone of <o>M</o>n between 1000 and 4000 and a dialkyl phosphorodithioic acid metal salt, in which of the alkyl groups, at least 70 mole % are secondary having 6 carbon atoms, no more than 15 mole % are primary, and no more than 15 mole % are secondary having less than 6 carbon atoms.
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