A lubricating composition comprising an oil of lubricating viscosity and a copolymer obtained/obtainable by either: a process comprising the steps of: reacting (i) an α-olefin and (ii) an ethylenically unsaturated carboxylic acid or derivatives thereof or derivatives thereof to form a copolymer; esterifying the copolymer of step with a primary alcohol branched at the β-or higher position to form an esterified copolymer; and reacting the esterified copolymer of step with an amine in an amount to provide the esterified copolymer with 0.01 wt % to 1.5 wt % nitrogen, wherein the primary alcohol branched at the β- or higher position has at least 12 to 60 carbon atoms; and wherein the copolymer of step has a reduced specific viscosity of up to 0.08cm 3 /g; or a process comprising the steps of: reacting (i) an α-olefin and (ii) an esterified carboxylic acid or derivatives thereof, wherein the esterified carboxylic acid or derivatives thereof has ester groups derived from a primary alcohol branched at the β- or higher position, to form a product; reacting the product of step with an amine in an amount to provide the esterified copolymer with 0.01 wt % to 1.5 wt % nitrogen, wherein the primary alcohol branched at the β- or higher position has at least 12 to 60 carbon atoms; and wherein the copolymer has a reduced specific viscosity of up to 0.08cm 3 /g; wherein the reduced specific viscosity is measured by the formula RSV = (Relative Viscosity - 1)/Concentration, wherein the relative viscosity is determined by measuring, by means of a dilution viscometer, the viscosity of a solution of 1.6 g of the copolymer in 100 cm 3 of acetone and the viscosity of acetone at 30 °C. a process comprising the steps of: reacting (i) an α-olefin and (ii) an ethylenically unsaturated carboxylic acid or derivatives thereof or derivatives thereof to form a copolymer; esterifying the copolymer of step with a primary alcohol branched at the β-or higher position to form an esterified copolymer; and reacting the esterified copolymer of step with an amine in an amount to provide the esterified copolymer with 0.01 wt % to 1.5 wt % nitrogen, wherein the primary alcohol branched at the β- or higher position has at least 12 to 60 carbon atoms; and reacting (i) an α-olefin and (ii) an ethylenically unsaturated carboxylic acid or derivatives thereof or derivatives thereof to form a copolymer; esterifying the copolymer of step with a primary alcohol branched at the β-or higher position to form an esterified copolymer; and reacting the esterified copolymer of step with an amine in an amount to provide the esterified copolymer with 0.01 wt % to 1.5 wt % nitrogen, wherein the primary alcohol branched at the β- or higher position has at least 12 to 60 carbon atoms; and reacting (i) an α-olefin and (ii) an esterified carboxylic acid or derivatives thereof, wherein the esterified carboxylic acid or derivatives thereof has ester groups derived from a primary alcohol branched at the β- or higher position, to form a product; reacting the product of step with an amine in an amount to provide the esterified copolymer with 0.01 wt % to 1.5 wt % nitrogen, wherein the primary alcohol branched at the β- or higher position has at least 12 to 60 carbon atoms; and wherein the reduced specific viscosity is measured by the formula RSV = (Relative Viscosity - 1)/Concentration, wherein the relative viscosity is determined by measuring, by means of a dilution viscometer, the viscosity of a solution of 1.6 g of the copolymer in 100 cm 3 of acetone and the viscosity of acetone at 30 °C.