Look, The oil in the turbo inlet is the final key for me. I had exactly that same problem when my rings were worn down and I had excessive blow-by. It pushes oil into everything. If the pistons are not cracked then the car will be ok for NA driving but it will consume oil. It will not be a "good" car when you sell it as I'm guessing everything is just tired and worn out for any performance stuff. For an everyday beater the engine may be fine for a while.

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black