Look in the intake side for oil residue. If you can remove the turbo itself and look for caked on oil exhaust down pipe. Make sure your turbo drain line isn't kinked or blocked. does it smoke on start up then go away after a few minutes? This is a typical valve seal trait. Does it smoke only after it warms up? This would tend to be more of a turbo seal or drain situation. Just my two cents. good luck! Let us know how you make out. sorry after rereading the original post is sound a lot like Valve seals.
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