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A pour point depressant works by

  • A.raising the oil's viscosity index
  • B.altering the shape of the wax crystals
  • C.dissolving the wax completely in the oil
  • D.removing the wax from the oil chemically

Answer: B

Co-crystallising with the paraffin prevents the plate-like crystals from interlocking into a gel, so the oil still flows though wax is present. It does not lower the cloud point, which is why the two figures diverge in a treated oil.

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