| 摘要 |
A lubricating oil composition comprising a major amount of mineral lubricating oil and at least a viscosity index-improving amount of an oil- soluble, saturated ethylene copolymer, preferably an oxidatively and mechanically degraded ethylene copolymer, having an ethylene content of 26-79 wt. % (35.85 mole %), a C3 to C18 higher alpha-olefin and from 0.05 to 3.0 wt. % of 2,5-norbornadiene and preferably at least a pour point depressing amount of a lubricating oil pour point depressant, e.g. an alkyl fumarate/vinyl acetate copolymer, whereby superior low temperature viscometrics is provided to said lubricating oil composition as compared to the same formulation using an ethylene copolymer not containing 2,5- norbornadiene. |
