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Which advice reduces fouling in service?

  • A.Nothing
  • B.Periodic extended runs at higher load, which raise the temperature enough to limit the accumulation of deposits
  • C.Regular longer journeys at sustained load
  • D.Frequent oil changes only, which remove the contamination and therefore prevent the deposits from forming

Answer: C

A regular long run keeps temperatures high enough to limit the build up. The last option explains exactly that benefit, which makes it a correct and more practical version. Oil quality matters too. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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