NCWayne, I think you need to do a little more research before you post inaccurate details although you put a disclaimer at the end of your post.
There are two different technologies that you just mentioned. Diesel Particulate Filters with Cooled Exhaust Gas Recirculation (DPF w/ CEGR) and Selective Catalytic Reductiion (SCR). These are very different systems.
You statement that Diesel Exhaust Fluid (DEF) will give problems in extreme cold temps is not true. The tanks on the vehicles are built for expansion and have a heating mechanism built in to thaw the tank out. The way to think about SCR is this, it is basically a Tier 2 engine, with an exhaust after treatment system. The engine is allowed to perform at its peak. (Tier 2 engines were more fuel efficient thant Tier 3) DEF is added after the fact. Nothing is added to the engine, just the exhaust.
Particulate filters would apply to the DPF w/CEGR systems (current Dodge pickups [not cab chassis] and Tier IV John Deere.) These units inject diesel into the filter to burn off particulate matter (regen cycle). These units also pump exhaust gas back into the engine. So, burn of particulates with fuel (more heat) and put exhaust gas back into the engine (more heat). When the DPF becomes plugged (this will happen) you have a serious issue.
SCR is where you will see everything end up where it is feasible to add a catalyst tank for the chemical reaction to occur. On smaller units, you will see DPF systems, but it is based on the number of hours and the total room for putting the emissions package on the unit.
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