Our 2008 Monaco Dynasty was the first year of the DPF. Did not have one issue with it over 7.5 yrs. and almost 70,000 miles. We had a regen about once every 8K-10K miles.
Now, with the new 2015 and 24,000 miles, no problems with the DPF and using DEF. It has gone through 2 regeneration cycles.
Brother bought a new 2014 Tiffin 1.5 yrs. ago with DPF that also has DEF, no problems there either.
Another brother bought a new 2015 RAM diesel last October to pull his travel trailer and no problems.
Luck? I don't know.
MM.
