it can be a few things....
could be turbo... when it boosts it will blow oil past the seals.... if it was your valve seat seals you wouldnt have much comrpession if it was bad it would only puff out a likl when you first rev it then nuffin .... it could be ya rings are warn out or ont heyre way or blowby .. symptons of blowby is warn out rings or blocked pcv valve can be one of those