My 2005 60,500 mile Subie just blew the turbo. Under similar circumstances with the other posts, it happend when my 'check engine' light came on and it turns out that the AVLS cams were being starved of oil. Right before the check engine light came on I heard a pop in the ebgine area and lost a lot of power. It has been maticulously maintained and serviced. and the oil was clean when this happened.
Becasue it was barley over warranty subaru graciously covered the cam work but the blown turbo cost is unfortunatley mostly on me, I guess becasue they discovered that after the fact.
My advice to anyone else is that when that oil screen/cam posisition sensor warning comes on have them deal with the turbo too. They are apparently related.
I hope this helps in your data gathering