Discussion
Which claim about diesel particulate filters is incorrect?
Answer: D
Correct answer: They need no maintenance or intervention over their life
A filter accumulates incombustible ash from lubricant additives, which regeneration cannot remove. Ash builds up over the vehicle's life and the filter must eventually be cleaned or replaced.
The other three are true: soot is trapped in porous wall-flow channels, regeneration is periodic and necessary, and repeated short cold journeys prevent it and block the filter. The device is maintenance-intensive by the standards of the catalyst it accompanies.
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