Problem: Explain why the viscosity of multigrade motor oils is less temperature dependent than that of single-grade motor oils.

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Viscosity is a measure of a fluid's resistance to flow.  It also corresponds to the informal concept of thickness of liquids. 

Multigrade motor oils are composed of polymers which coils at low T but unwinds at high T. This particular polymers are highly compressed at low temperature. They do not contribute very much to the viscosity of the liquid because of their compact shape

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Problem Details

Explain why the viscosity of multigrade motor oils is less temperature dependent than that of single-grade motor oils.