Patent ID: 7776804

Claim:
A lubricant composition comprising: an oil of lubricating viscosity; (A) about 0.05 to about 1.5 percent by weight of a copolymer comprising about 70 to about 79 percent by weight of units derived from ethylene (“E”), having a M w of about 50,000 to about 100,000, M w / M n less than about 3, density (“D”) of about 860 to about 896 kg/m 3 , and a melting point (“T m ”) of about 15° C. to about 60° C., wherein E and T m fulfill the expression 3.44 E− 206≧ T m ; and (B) about 0.05 to about 1.5 percent by weight of a block copolymer comprising a first block which comprises a vinyl aromatic comonomer and a second block which comprises a diene comonomer, the diene monomer-containing block being hydrogenated, wherein vinyl aromatic monomer content of the block conolymer (B) is about 10 to about 60 weight percent; wherein the weight ratio (A):(B) is about 20:80 to about 60:40, wherein the block copolymer (B) comprises at least one homopolymer or homo-oligomer segment of the vinyl aromatic monomer, and wherein the block copolymer (B) is a star polymer.