Specified C.sub.14 -carboxylate/vinyl ester polymer-containing compositions for lubricating oil flow improvement

A lubricating oil composition comprising lubricating oil, and a dual additive composition in an amount and additive ratio effective to improve, relative to the absence of one or more components of said dual additive composition, at least the low temperature flow properties of said lubricating oil composition when also containing a viscosity index improving amount of a viscosity index improver, said dual additive composition comprising, as a first component at least one of (a) low molecular weight polymer of unsaturated carboxy ester having the formula:

• ##STR10## wherein R' is selected from the group consisting of hydrogen and COOR, and wherein R is a C.sub.14 alkyl group, and (b) low molecular weight copolymer of carboxy ester of formula (I), and vinyl ester represented by the formula:
• ##STR11## wherein R.sub.1 comprises an alkyl group containing from 1 to 18 carbon atoms, and as a second component at least one lubricating oil flow improver comprising low molecular weight non-ethylene-containing polymer or interpolymer containing pendent ester groups, having repeating methylene units derived from a mixture of alcohols present within the structure of said pendant ester groups.

The lubricating oil composition of any one of claims 53, 55 or 56 wherein said first component is interpolymer of C.sub.14 -dialkyl fumarate and vinyl acetate.

The lubricating oil composition of any one of claims 57, 59 or 60 wherein said first component is interpolymer of C.sub.14 -dialkyl fumarate and vinyl acetate.

A lubricating oil concentrate comprising lubricating oil, and a dual additive composition in an amount effective to improve, relative to the absence of either of said dual additive composition components, at least the low temperature flow properties of lubricating oil compositions derived from said concentrates, when containing viscosity index improver, said additive composition comprising as a first component, at least one of (a) low molecular weight polymer of unsaturated carboxy ester having the formula:

• ##STR13## wherein R' is selected from the group consisting of hydrogen and COOR, and wherein R is a C.sub.14 alkyl group, and (b) low molecular weight copolymer of carboxy ester of formula (I), and vinyl ester represented by the formula:
• ##STR14## wherein R.sub.1 comprises an alkyl group containing from 1 to 18 carbon atoms, and as a second component at least one lubricating oil flow improver comprising low molecular weight non-ethylene-containing polymer or interpolymer containing pendent ester groups, having repeating methylene units derived from a mixture of alcohols present in said pendant ester groups.

The lubricating oil concentrate of any one of claims 68 to 70 wherein said vinyl ester employed for both said first and second components is vinyl acetate.

A method for improving at least the low temperature flow properties of a lubricating oil composition when containing a viscosity index improving amount of a viscosity index improver, which comprises adding to said lubricating oil composition a dual additive composition comprising as a first component at least one of (a) low molecular weight polymer of unsaturated carboxy ester having the formula:

• ##STR17## wherein R selected from the group consisting of hydrogen and COOR, and wherein R' is a C.sub.14 alkyl group and (b) low molecular weight copolymer of carboxy ester of formula (I), and, vinyl ester represented by the formula:
• ##STR18## wherein R.sub.1 comprises an alkyl group containing from 1 to 18 carbon atoms, and as a second component at least one lubricating oil flow improver comprising low molecular weight non-ethylene-containing polymer or interpolymer containing pendent ester groups, having repeating methylene units derived from a mixture of alcohols present within the structure of said pendant ester groups;
• the amount and additive ratio of said first and second components being effective to improve the low temperature flow properties of said lubricating oil composition relative to the absence of either of said first and second components.