egr systems are different than other years
they added the urea system to the DPF so its an added fluid that gets put in to help keep the dpf clean.
they have a bad sagging problem when towing due the softer rear springs, this was done to improve the ride from ford. So if he tows a lot it will need air bags.
kind of a small turbo but from stock it spools great, but does seem to run out of air pretty quick when you start tuning them.
there are signs of weak turbos and rods, mine is a early model 11' with 82k on it and has been tuned since 10k and still has stock rods and stock turbo and has been beaten from day one. Rods and turbo soon to change this winter but still on the factory stuff for now.
when they are stock from the factory, mine got great MPGs, was super quiet. 1st diesel i have owned that you didnt have to shut it off when you pulled up to the speaker at the drive thru line. rode great from factory and just all around damn good truck. For someone who works out of them like i do and is behind the wheel alot or does a lot of traveling, hands down its the way to go.