Thing is a lot of people believe or buy into that BS, before I retired we got a new 125' hi-line truck that we did barehand hot work out of, everyday we would shutdown an hour early to send 1 man in it to go put it on the interstate so it could be run wide open down the interstate to possibly stand a chance of keeping it out of limp mode so we could work the next day, in all my years prior to that we had diesel trucks with no DEF and no problems or rare problems, the company lost a lot of money in lost man hours alone by shutting down an 8 man crew an hour early everyday, so I like you have to laugh when I see the reliable and robust comments, and while I do believe they are getting better this thing has put many reliable manufacturer's of diesel engines out of business, they saw the handwriting on the wall.