Okay, I have a 2006 with the 5.9L CTD. Last night I used the AC and I noticed that when I would take off from a light there would be a little grayish/white smoke. So at the next light I figured might as well clear this out so I gave it a little more throttle when leaving the light and just smoked the guy in the convertible next to me out (was kinda funny,not for him but just sayin). It will only do it under load. Several days earlier I had noticed just a tiny puff when putting it in reverse to back into my parking spot which when backing up is on an incline. Again under load. Could this be injectors ? Also I have only been using it around town lately....no towing , no extended use. Maybe it needs to get run out on the highway a little ? Never mind I towed with it last weekend and had in on the highway for about 6 hours. I did fill up at a place that probably does not use a whole lot of diesel though ? Any thoughts or suggestions. Truck is completely stock.

 

Mine blew some white one time when I had bad fuel, even went into limp mode, new fuel filter and new fuel cleaned it out and code went away.

 

Pull the oil dipstick and see if its overfull or smells like diesel fuel. If so, leaking injector, overfueling while running.

Dave