GTSSportCoupe
2LTE abuser
Usually blow-by is a issue with the rings/cylinder bore. It's possible if the valve guides/seals were shot some pressure could get into the crank case that way, but from my experience with these motors, I'd say it's unlikely.
I think the question should be, why do you think your turbo needs rebuild/replacement? If it's just oil in the intake, then more likely as Nas90tdi said, it's just the oil from the PCV breather. However, if the oil is coming out the turbine into the exhaust, then as Dougal said, it could very well be from blow-by. When I ruined my old 2LTE shortblock and it had lots of blow-by, it was pushing oil out the turbine seal into the exhaust even though the turbo was in fine condition.
Make sure you clean the surface of your block really really well when you do your cylinder head job. Scrape/scrub it meticulously clean. Also, clean the head bolt holes with brake clean and blow them out with compressed air. Follow the factory repair manual when you torque the head down (do the multiple passes in the right sequence with the right torque - put oil on the threads and under the bolt heads too). If you're not careful about this part, you can end up with headgasket issues in the future. It's a multi-layer-steel gasket that normally will never let you down...but it also has no tolerance for imperfect surfaces.
I think the question should be, why do you think your turbo needs rebuild/replacement? If it's just oil in the intake, then more likely as Nas90tdi said, it's just the oil from the PCV breather. However, if the oil is coming out the turbine into the exhaust, then as Dougal said, it could very well be from blow-by. When I ruined my old 2LTE shortblock and it had lots of blow-by, it was pushing oil out the turbine seal into the exhaust even though the turbo was in fine condition.
Make sure you clean the surface of your block really really well when you do your cylinder head job. Scrape/scrub it meticulously clean. Also, clean the head bolt holes with brake clean and blow them out with compressed air. Follow the factory repair manual when you torque the head down (do the multiple passes in the right sequence with the right torque - put oil on the threads and under the bolt heads too). If you're not careful about this part, you can end up with headgasket issues in the future. It's a multi-layer-steel gasket that normally will never let you down...but it also has no tolerance for imperfect surfaces.