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What are viscosity index improvers?

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What are viscosity index improvers?

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Viscosity index improvers (VII), also known as viscosity modifiers, are specially developed polymers that are used to change the viscosity characteristics of the oil, specifically to provide the low temperature flow properties in combination with high temperature viscosity required to produce multigrade oils. Nearly all multigrade engine oils will contain viscosity index improvers, monograde oils do not contain these additives.

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