CPC C10M 143/04 (2013.01) [C08F 210/06 (2013.01); C10M 169/041 (2013.01); C08F 2800/20 (2013.01); C10M 2203/003 (2013.01); C10M 2205/024 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2040/25 (2013.01)] | 25 Claims |
1. A lubricant oil composition comprising:
a major amount of a lubricant base oil; and
a minor amount of a viscosity index improver comprising a syndiotactic propylene-based ethylene-propylene copolymer comprising:
a) 2 to 20% by weight of ethylene
b) 80 to 98% by weight of propylene;
c) 50 to 99% rr triads; and
d) Mw (LS) of 10 to 250 kg/mol.
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