| 摘要 |
A lubricant composition comprising an oil of lubricating viscosity; (A) 0.05 to 1.5 percent by weight of a copolymer comprising 70 to 79 percent by weight of units derived from ethylene ("E"), having a {overscore (M<SUB>w </SUB>of 50,000 to 100,000, {overscore (M<SUB>w</SUB>/{overscore (M<SUB>n </SUB>less than 3, density ("D") of 860 to 896 kg/m<SUP>3</SUP>, and a melting point ("T<SUB>m</SUB>") of 15° C. to 60° C., wherein E and T<SUB>m </SUB>fulfill the expression <?in-line-formulae description="In-line Formulae" end="lead"?>3.44E-206>=T<SUB>m</SUB>;<?in-line-formulae description="In-line Formulae" end="tail"?> and (B) 0.05 to 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 the weight ratio (A):(B) is 20:80 to 60:40; exhibits good low temperature performance and durability.
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