you dont say what 'between changes' equates too or your typical driving pattern, or if its a low or high presure turbo....
my advice (having fought a similar problem on a turbo brick) is to SELL - i recieved similar advice, replaced the turbo and made no diffecnce, the car compresison tested fine etc etc...several $1000 later and i hade exactly the same oil use i did to start...sold the car would have been better to do so straight away.....
BTW tradidtionally if it only smokes on startup and then it goes away its a clasic sign of valve seals....but my experience of bricks sugegst they can ingest one hell of a lot of oil before you get visible smoke.....
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