To find out about a smoking turbo(leaking turbo seal), let it idle for about half an hour and see if any white smoke is coming from the tailpipes. It’s a combination of blown turbo seals and a bad setup for the PCV system. If you can get record from the previous owner on oil changes and whatnot, then you might be able to get good will, or free, replacement should something happen.
Link to a copy of the turbo TSB