Sassy here, I fully understand what your saying about the 6.0 will try to find a 7.3 but I think they are beyond the yrs Dunham is requiring -Had a terrible time even finding a Diesel Ford in my Area.At the time the purpose was towing RV. Hence it's at 60K miles about now. Pretty pampered huh!
Do keep up With Diesel Power Mag/forum.Do service /mait regularly
and Change Oil way before the recommended 10,000 miles.
I realized at the Expo I am not the only one that runs around with Spare Parts and replaces everything based on mileage whether it's ready or not(LOL)
I am learning Diesel , I imagine I will learn a whole lot more!