The Cummins wrist pin problem is for the ISL #46543077 - 46603939 for the 2005- 2006 years. Guess you could try and negotiate a lower price on a MH with one of those engines but by now it would have failed if it was going to IMHO.
The average DP use/year is 5-8K miles and at 10 years I'm at 68K miles. I plan on keeping my 04 Dynasty for another 10-15 years and doubt I'll have any major drive train expense... OK tires but I got 10 years out of the first set and with care and careful inspection plan to do that again.
From my reading the engines using DEF appear to get slightly better fuel mileage but when you add the cost of the DEF it appears to be a wash.
