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Which consequence follows from using an unsuitable oil?

  • A.Only cost
  • B.Premature filling of the filter with incombustible residue, shortening its life by a substantial proportion
  • C.Ash accumulates faster and the filter blocks early
  • D.Nothing, since the ash is removed during regeneration along with the soot that has been trapped within it

Answer: C

The wrong oil can halve a filter's life. The last option quantifies the consequence, which makes it a correct and more concrete version. The ash cannot be burnt away. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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