JimM68 wrote:
In 2008 / 2009, you get a DPF (diesel particulate filter). Every once ina while it needs to go thru a cleaning cycle (regeneration). No big deal at all unless you are nearly home and approaching your exit. When it goes into regen, you hafta stay on the highway at speed for about 30-40 minutes. It does this maybe twice a year.
In 2010 and up, they have DEF (diesel exhaust fluid) in addition to DPF. So you still have the regen cycles, and also have this little tank of stuff to keep full.
There aren't any more regen cycles. Today's modern engines pretty much regen continuously. Yes, it can happen, but I doubt the typical RVer will ever see a regen light on the dash ever.