| 摘要 |
A base oil for an SAE 0W-40 lubricant composition comprises a mineral basestock, a polyalpha-olefin and a synthetic ester lubricant The SA E 0W-40 lubricant comprises the base oil and a viscosity index improver select ed from the group consisting of polymethacylate, olefin polymer, hydrogenated diene, copolymer mixtures of all three or mixtures of olefin polymer and hydrogenated diene copolymer.
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