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Which deposit indicates oil reaching the combustion chamber?

  • A.A tan deposit
  • B.A grey ash deposit, which is left by the additives within the oil after it has been burnt during combustion
  • C.A wet black oily film on the electrodes
  • D.A dry black sooty deposit, which is produced by the excess fuel burning incompletely within the cylinder

Answer: C

Wet oil fouling points to worn rings, valve stem seals or a failed turbocharger seal. Ash deposits genuinely come from burnt oil additives too, which makes the last option a real related observation. Dry soot indicates rich mixture. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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