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Which component reduces the oil reaching the intake?

  • A.An effective crankcase oil separator
  • B.The air filter, which removes the oil mist from the air before it enters the intake tract of the engine
  • C.Nothing
  • D.A separator in the breather system, which returns the oil to the sump rather than letting it pass to the inlet

Answer: A

A good separator returns the oil to the sump instead of the inlet. The last option explains exactly that function, which makes it a correct and more detailed version. Its failure accelerates fouling markedly. The shared behaviour explains why these belong together and the differences explain why both exist. The order in which the effects act is what decides the outcome, so it is worth establishing first. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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