help with L10 issue

Hey guys. So I need some help on what I could be looking at with a smoking issue. Yes, I know its a Cummins. But this truck has been very good with no smoke over its life. It only has 400,000 true miles on it.
So here it is. I start the truck and there is an initial puff of smoke and then clears up to no smoke at all within about 10 seconds. None. So what I have noticed is that after I did an oil change, with oil and fuel filter, it seems to now smoke. But not all the time and not initially. Like I said, I start it up and no smoke at all. I run to the factory where I haul manufactured homes, which is about 80 miles away. When I get there it is smoking pretty good. It seems to be a bluish white smoke. Over the winter before the oil change I do not remember it smoking like this at all. Last time I got home and let it sit about an hour or maybe a little longer. Came out and started and no smoke again. Don't know if this could be a sticking injector or maybe something with the STC or what. Any advice would be appreciated. 1994 Ford L9000 with the mechanical L10 and 9 speed.

 

I will smell it next time I get to the factory and its smoking. Air filter is good. As for the turbo I will have to take a look at it. I replaced that about 4 years ago. Hope that didnt go again.