Chemical Process
Viscosity index improver (like polystrene or polyisobutylene) is added to lubricant to

Increase its viscosity
Reduce the variation in its viscosity with temperature
Increase the variation in its viscosity with temperature
Reduce its viscosity

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Chemical Process
Unsaturated oils compared to saturated oils have

Higher melting point & higher reactivity to oxygen
Lower melting point & lower reactivity to oxygen
Lower melting point & higher reactivity to oxygen
Higher melting point & lower reactivity to oxygen

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