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Black smoke from the tail pipe means the engine is not getting any air like a dirty air filter. I think your mechanic is telling you is that you need a new turbo. The turbo boost incoming air pressure to the engine and if it is bad then it will not let enough air into the engine causing black smoke from the tail pipe.
It's likely that the bad bearings and resultant oil seepage from the bad turbo caused oil to pool up in the intercooler piping (this is common). With a new turbo in there, you won't have further oil seepage, so the remainder of the oil in the piping should burn off. Over the next little while, you should see the amount of smoke coming out continue to diminish. If it does not, and is still smoking in a week or two, post back up on here and we'll take it from there.