Quote:
Originally Posted by clarknova
I drove a 2015 school bus with a Cummins 6.7 for two years and I never once saw the regen light turn on. Probably because I drove a rural route. I don't recall if the oil was black in that one.
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Enabling the engine to run for a longer time at higher RPMs decreases the soot buildup at the DPF, so there are fewer and shorter regen cycles. On a sidenote, I guess those rural routes didn't have any of those no-idling policies.