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• DPFs: What are they and why do they go wrong? (FAQs)
  If complete regeneration is not possible within this period, the regeneration will be interrupted. Question: How does regeneration affect the oil life? Answer: On each regeneration or attempted regeneration, a certain diesel fuel amount is injected into the engine oil which reduces the oil life. If the "INSP" light in the instrument cluster comes on, the engine oil is exhausted and must be changed.