The oil smell is probably a small oil leak falling on something exhaust related.
I'm at 120k on stock turbo (lasted twice as long as the engine!) ,and it looked solid at 90k mi. ~4000mi OCI with synthetic (this is based on blackstone UOAs). I don't think the type of synthetic matters much (though I use 5w40 because it holds pressure better at track temps than 5w30), but it does seem to handle high heats better than dino juice. The 7500mi dino oil recommendation you see in the manual has been revised by subaru to 3750mi.
Oh and banjo bolt removal.
The most important is to check your damn oil frequently. These cars can burn oil quickly and irregularly due to blowby. Some oil starvation is due to the banjo bolts, but you'll also seem failures on cars where the banjo bolt was removed but the owner didn't check their oil. I check every fillup. It takes 2 minutes. Cheap insurance.
Last edited by nm+; 12-24-2012 at 06:21 PM..