Synthetic polyolefin lubricant blends

A lubricant mixture having enhanced viscosity index comprising:

• low viscosity C.sub.20 -C.sub.60 lubricant range liquid comprising substantially linear hydrocarbons prepared in at least one process step by shape selective catalysis of lower olefin with medium pore acid zeolite catalyst to provrde C.sub.20.sup.+ hydrocarbon lubricant range basestock, said lubricant range liquid having a kinematic viscosity of about 2-10 at 100.degree. C.;
• and
• a viscosity improver comprising at least one poly(.alpha.-olefin) having viscosity of at least about 20 cS and viscosity index improvement properties.

A lubricant mixture having enhanced viscosity index comprising:

• a) a major amount of low viscosit C.sub.20.sup.+ lubricant range liquid comprising hydrocarbon moieties prepared by shape selective catalysis of lower olefin with medium pore acid zeolite catalyst to provide C.sub.20.sup.+ hydrogenated lubricant basestock, said lubricant basestock liquid having a kinematic viscosity of about 2-10 cS at 100.degree. C.;
• and
• b) a minor amount of hydrogenated poly(o-olefin) having viscosity of at least about 20 cS and viscosity index improvement properties, said poly(o-olefin) having a number average molecular weight of about 300 to 30,000, weight average molecular weight between 300 and 150,000, molecular weight distribution between 1.00 and 5, viscosity index greater than 130 and pour point below -15.degree. C., wherein the weight ratio of components b:a is about 1:20 to 1:2.