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The carbon residue test on an oil measures the coke left after

  • A.complete combustion of the oil in air
  • B.saponification of the oil with alkali
  • C.prolonged storage of the oil at ambient temperature
  • D.destructive distillation of the oil

Answer: D

It indicates how much carbonaceous deposit the oil would leave on hot surfaces such as piston rings and valve stems. A heavy residue makes an oil unsuitable for high-temperature service however good its other properties.

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