The 6.0s and the 6.4s really left me bitter.
You give 100% to the repair and honestly think you've repaired the vehicle, only to have it come back with a different problem.
There have been too many times where I put an injector in a van, only to have another one go out on a road test. And, it don't pay to another one in!
Being certified at the dealership ment you get all the crap work, while the noncertified guys are doing all the gravy work. Used to be that the gravy work would sustain you while you tackled all the "tough" jobs.
I'll get off my soap box.