Honestly... I talked to Ron (my buddy that is a fleet service manager for a large construction company) about the DPF and SCR systems. His response was that they require periodic maintenance and that trucks that are run daily have fewer issues than ones that are run occasionally. He was referring to some of their specialty trucks that sometimes might sit in their yard all winter until they get called out for service in the field again. His comments were relevant because he knows how much / often we get out in our Seneca and he does not consider our Seneca as a vehicle that sits idle much.
His other comments were around regular maintenance, keeping DEF from freezing in our winter climate, DPF cleaning schedules and stuff. They don't have to deal with SCR systems on their Yellow Iron, but they have a lot of trucks that are EPA compliant in Utah, Nevada and California. They have more issues with keeping SCR systems functioning because of the cold.
Steve & Stacy with Jasper (Australian Cattle dog)
2015 Seneca 36FK
Custom 27' flatbed trailer hauling:
07 Toyota FJC & Yamaha Kodiak 400 ATV