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Which of the following would NOT be a reason to reject a used engine oil?

  • A.the presence of water in the sample
  • B.a black colour from suspended soot
  • C.a high acid or neutralisation value
  • D.a marked fall in viscosity

Answer: B

Blackening shows the detergent-dispersant is holding the soot in suspension where the filter can reach it, which is the additive working as intended. Acidity, viscosity loss and water each indicate genuine degradation or contamination.

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