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Which service life does a filter typically achieve?

  • A.About twenty thousand kilometres, after which it must be replaced as a routine service item on the vehicle
  • B.Indefinite
  • C.A long life given suitable use and oil, since ash accumulation rather than soot ultimately determines its end
  • D.Well over a hundred thousand kilometres if properly used

Answer: D

Filters last a long time when the vehicle is used and maintained suitably. The last option explains what actually limits the life, which makes it a correct and more instructive version of the same answer. 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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