| 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 weigh t of units derived from ethylene ("E"), having a weight-average molecular weig ht of 50,000 to 100,000, polydispersity less than 3, density ("D") of 860 to 89 6 kg/m3, and a melting point ("Tm") of 15 ~C to 60 ~C, wherein E and Tm fulfil l the expression 3.44E - 206 >= Tm; and (B) 0.05 to 1.5 percent by weight o f 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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