Lubricant compositions which exhibit low degree of haze and methods of preparing same

A lubricating oil composition comprising a major amount of lubricating oil of an SUS viscosity at 100.degree. F. of between about 75 and 300, between about 0.5 and 30 wt.% of an ethylene-propylene copolymer of a molecular weight between about 10,000 and 150,000, a propylene content of between 20 and 70 wt. % and a polydispersity index of less than about 5, and between about 0.005 to 10 wt. % of a neat interpolymeric polyalkylmethacrylate of (A) C.sub.1 -C.sub.15 alkylmethacrylate and (B) C.sub.16 -C.sub.22 alkylmethacrylate having a weight ratio of A:B of between about 90:10 and 50:50, a molecular weight of from 1000 to 25,000 and an average alkyl side chain length of between about 11 and 16 carbons.

A method of producing a single phase lubricating oil of improved pour and viscosity index comprising a major amount of hydrocarbon lubricating oil of an SUS viscosity at 100.degree. F. of between about 70 and 5000, between about 1 and 10 wt. % polyalkylacrylate pour depressant, a neat interpolymeric polyalkylacrylate of (A) C.sub.1 -C.sub.15 alkylacrylate and (B) C.sub.16 -C.sub.22 alkylacrylate having a weight ratio of A:B of between about 90:10 and 50:50, a molecular weight of from 1000 to 25,000 and an average alkyl side chain length of between about 11 and 16 carbons and an ethylene-propylene viscosity index improving copolymer of a molecular weight of between 10,000 and 150,000 a propylene content of between 20 and 70 wt. % and a polydispersity index of less than about 5, comprising admixing the hydrocarbon lubricating oil with said polymeric pour depressant formed under neat conditions and said VI improver.

A method of producing a single phase lubricating oil of improved pour and viscosity index comprising a major amount of hydrocarbon lubricating oil of an SUS viscosity at 100.degree. F. of between about 75 and 300, between about 1 and 10 wt. % polyalkymethacrylate pour depressant, a neat interpolymeric polyalkylmethacrylate of (A) C.sub.1 -C.sub.15 alkylmethacrylate and (B) C.sub.16 -C.sub.22 alkylmethacrylate having a weight ratio of A:B of between about 90:10 and 50:50, a molecular weight of from 1000 to 25,000 and an average alkyl side chain length of between about 11 and 16 carbons and an ethylene-propylene viscosity index improving copolymer of a molecular weight of between 10,000 and 150,000, a propylene content of between 20 and 70 wt. % and a polydispersity index of less than about 5, comprising admixing the hydrocarbon lubricating oil with said polymeric pour depressant formed under neat conditions and said VI improver.