How often does your truck give you a light to regen?

Varies, but usually every 2 to 3 days on the 06 Mack Putz I operate. Depends how long you drive and how long you're running while pumping.

An ‘06 Mack doesn’t regen.  Perhaps it’s an ‘08.   I’ve heard daily or twice daily horrors of ‘08&’09’s.   A little less for 2010 thru 2013.   We have some 2016’s that acccording to the ecu have done a regen twice (once a year).   Depends on use I suppose, but I’ve never seen these ones actually regen.   Perhaps when driving.