Information dump, get ready…
The EGR and DPF create unique problems to diesels.
The EGR (exhaust gas recirculator) takes raw exhaust gas and send it back in the intake via a butterfly valve. What they say it does: Reduces SOx and NOx emissions. What it also does: Sends sooty, disgusting air right back into the engine to contaminate your oil, gum up your valves, and mess with your injectors ($$$, let me say it again, $$$).
The DPF (diesel particulate filter) filters out soot and other exhaust contaminants. It uses fuel (old skool, they changed over in 2013 or so) or DEF to assist in “regenerating” the filter when the pressure drop across it gets to a certain value. The problem with idling and the DPF, is that the DPF needs a certain exhaust gas temperature for a certain amount of time in order to regenerate the filter, usually only achievable at highway speeds. If you idle idle idle the way a lot of diesel guys do, the engine never makes that temperature, and the filter gets really gummed up - even if it tries to regen at idle, it won’t do it properly. When it gets boogered up like that, it never regenerates properly again, and you’ll have problems with it forevermore. The temperature required for a burn off is incredible, even with DEF - in the range of 1200-1400F. That’s why the Ford exhaust tips have little flutes at the end of them - if you walk past it while it’s trying to regen in park, you will get severely burnt, so they put the flutes in to draw ambient air and cool the surface temp down.
So, what to do. If you have to smog often and aren’t interested in having to wrench on the truck constantly to put the stuff back on to pass, you’re stuck with the equipment. And for a 12K plus premium for the diesel option, added reliability concerns with the emissions equipment is not welcome - I mean, isn’t that why we’re willing to pay the price, is for a 300k+ mile engine? The emissions equipment totally negates that. Now, I don’t include hotshotters with DOT #s here, because they work the ever loving crap out of the trucks pulling RVs and cars back and forth across country - that allows the trucks to run they way they’re designed. But for us regular joes, who won’t be pulling that hard or that often, it’s a real kick in the pants.
If you don’t have to smog, you have options. Deleting the equipment and overriding the ECM/PCM with a tuner (no one sells outright deleted tuners anymore for on-road use, but there are options, PM me if you want more info) is your best bet. Note that deleting the equipment doesn’t necessarily mean that you’ll be driving a smoking beast - the new engines don’t smoke unless you want them to. I’ve never seen my truck smoke, ever - but I tuned it that way. Smoke is money going out my tailpipe, and I’m not interested in that.
Sorry for the info dump. I can continue on, but will quit there because I get that not everyone is as interested in diesels as I am…