Lubricating composition containing a self-assembling polymethacrylate block copolymer and an ethylene-α-olefin copolymer

A lubricating composition comprising

• (a) an oil of lubricating viscosity;
• (b) 0.1 wt % to 1 wt % of an ethylene-α-olefin copolymer, wherein the ethylene-α-olefin copolymer is grafted with a polar moiety, wherein the polar moiety comprises an acyl group and wherein the acyl group is provided by 1.5% to 3.5% by weight of an ethylenically unsaturated acylating agent based on the total weight of the ethylene-α-olefin copolymer plus the acylating agent;
• and
• (c) 0.25 wt % to 15 wt % of a poly(meth)acrylate polymer wherein the poly(meth)acrylate polymer comprises a block or tapered block copolymer (P) comprising a first block (B1) having a Hildebrand solubility parameter greater than 18 (J/m3)1/2 and a second block (B2) having a Hildebrand solubility parameter of 14 to 18 (J/m3)1/2, wherein the poly(meth)acrylate polymer forms a self-assembled colloidally stable particle in the oil of lubricating viscosity,
• wherein the first block (B1) comprises at least 50 mol % at least two of C1, C2, C3 or C4 (meth)acrylate derived units and the second block (B2) comprises at least 50 mol % of at least two of C12, C13, C14, C15, C16, C17, or C18 (meth)acrylate derived units.