hum, I'd be interested to know what happened as well!

 

Internet speculation only gets you so far, have a leakdown test performed at a reputable shop or mechanic. This is a standard automotive test so it doesn't need to be a performance shop. If the results come back good then you'll know it's the turbo.

 

OP, sent you a reply email on the questions asked and posted.

Everything looks correct to me in here, lower the service interval on draining the can so it does not get over filled. Also, doubtful on the head gasket...however you will not know much until you do the tests Kracka mentioned above.