I just got this new truck, so i was reading up on the oil change interval. They have different tiers, from normal to severe duty. I'm kinda shocked by the engineers not knowing how trucks like this are used, but 4x4 use, towing, and "idling over 10 perfect of the time" is called "severe duty" So i always thought diesels idled forever, no problem. So i start looking into it.
Apparently, when a diesel idles, it forms very little heat. In cold weather this is even worse. The cold engine doesn't burn the fuel fully, so you have extra unburned fuel in the cylinder, which does everything from washing lubrication from the walls, sneaking by the piston rings to dilute the oil, and wet stacking, which is blowing unburned fuel in the exhaust. On old school straight pipe stuff, this isn't the end of the world, but on def protected stuff, is obviously very bad.
Ford goes so far as saying any warranty is void if a non ambulance set up vehicle is used for such. Ambulances idle a bunch, and so the ambulance package contains a high idle kit, which burns more fuel but runs everything hot enough to mitigate these problems.
After reading this stuff, I've decided to add a high idle kit, and I've been working on shutting my truck off more. In both summer and winter this is really impractical tho, and on the firing line it's impossible. If they are digging a hole and i can't do anything until they are done, I'm sitting in the climate controled cab, and the firing line you move your truck every 10 minutes. I've also decided that babying the truck isn't helping it, so I'm getting heavier and heavier with the acceleration, because in reality, this motor has so much power with my regular driving style it will never be used more than 40 percent of its power abilities, and diesels like at least 60 percent load. When i idle, I'll occasionally bump up to 1000 rpms, which will burn everything hotter. I'm also gonna send an oil sample to see how much fuel dilution is happening.