D16Z6, T4 57 Trim Turbo

I have never noticed this until a couple days ago. I started my car to warm it up one morning and went into the house. Came out about 10 min. later and noticed it was puffing like a dark white smoke. Revved it a little and then noticed that it was a mix of blue and white and it was pretty heavy. But then when I drive it for awhile and reaches fot it goes away. I checked intercooler and no oil. So turbo seals seem fine.
So could it be valve seals?
Or am I just being paranoid, it has forged pistons.

 

valve seals most likely....how many miles on the motor?

 

It has 7000 miles on the rebuilt motor.
But could it also be the catch can? I have only cleaned it once before. (I'm lazy)

 

Up for similar problem
Was told rings smoke all the time and valve seals on startup only