It seems like it could be a blown seal in the turbo, stuck PCV valve or bad valve seals.
However I had this same problem with my dad's Porsche and it turns out that it was just too much oil in the engine.
__________________
| Akuma | Motordyne | Z1 | NST | CNT | Stillen | Avant Garde | RJM | Performix | Tint | LED | GTR | Nissan |
|