I have Cummins ISL 8.9 400 hp that has the dpf an not def. Wondering when refueling or stopping for a quick lunch, is it okay to leave engine idling rather than shutting engine off? Not sure about clogging up dpf filter idling.
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The only time you’d want to keep it running, preferably driving at speed under light to moderate load, would be when the DPF is going through the regeneration cycle. From what I’ve heard, this most commonly occurs just as you reach your destination.