Getting back to Engines 101 TYPICALLY smoke can be labeled as such:
Blue: oil, as simple as an o-ring or valve seal
Black: fuel, as in rich/soot. HOWEVER, both times I stuck an injector, the last thing it did was blow grey smoke from the excessive fuel being dumped into the cylinder and not burning.
White: coolant

My input is this: coolant (leftover from running with a bad EGR cooler) + soot could look like oil.

But, that you went through four quarts of oil in four days does point at an oil leak. Before I kicked out the $ for a new turbo, I'd pull it off, clean it up internally (great how-to vids on you tube) and replace the seals.

 

I will try new seal I can do the work I don't know how to diagnose diesel .

 

Well I put new turbo in took care of smoking.......now turbo spools up slow then starts too pulse...any feed back would b good....thank u