The only way I can think to describe it. Not every time, but some times when I accelerate hard I get some gray/dusty looking smoke. It's not black, white, or blue. Kind of a combination I guess. This is an '07 5.9. I notice it better at night. Normal?

Thanks in advance!

 

Mine does it.

It is more of a haze on mine and only when I hammer on it.

 

It is called "unburned fuel" no engine uses all the fuel it gets at WOT. Check out the pipes on a Top Fuel Dragster or Funny Car when it is going down the 1/4 at night, flames three feet out of the pipes, unburned fuel.

 

Very Normal.