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A viscosity index improver is typically

  • A.a solvent that thins the oil when cold
  • B.a solid powder suspended in the base oil
  • C.a long chain polymer that uncoils as the oil warms
  • D.a metallic soap that thickens the oil when cold

Answer: C

The coiled molecule occupies little volume in cold oil and expands as the temperature rises, offsetting part of the thinning. Its drawback is that shearing in service breaks the chains and the improvement is progressively lost.

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