I picked up an 2006 back in June to be my mileage mule as I wanted to keep the heavy mileage off my 2012 which is actually my first diesel. One of the first things i noticed was that on a cold start (in the summer 20 to 30C) there was a significant plumage of whitish smoke. Although embarassing and smelly I didn't do anything to address the problem. Come fall as the temps dropped (say 6C) it not only smoked but had a few seconds of rough idle. Now in the dead of this Canadian winter (-20 to -30C) I can hardly get it started, some times two or three attemps including several glow plug cycles. Once it actually fires its super rough, barely idling (not sure why it doesn't through a CEL) and super smoky. The idle does smooth out after a few minutes going from hardly running, then dynamic idle kicking in sounding like a bit of a mis, then nearly as smooth as my 2012 all the while smoke disipating as it improves. I don't have a lot of history on the car. I know the engine isn't original, EGR cooler has been deleted and I just swapped the turbo as it was stuck. Any help here would be appreciated. I don't have any diagnostic equipment and I don't really want to needlessly through all kinds of parts at it.