| abstract |
A lubricating oil composition comprising a major amount of mineral oil of lubricating viscosity 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, optimally 0,8 to 2.5 wt. % of 2,5-norbornadiene and preferably at least a pour point depressing amount of lubricaitng oil pour point depressant, e.g. an alkyl fumarate vinyl acetate copolymer, whereby superior low temperature viscometrics is provided to said lubricating oil composition, compared to the same formulation using an ethylene copolymer not containing 2,5-norbornadiene. |