I could be wrong but if the turbo seal was leaking you wouldn't see it external to the turbo rather, you would notice smoke when you boost. I would go over all your oil lines and trace them for any oil. That is an easy place to start.
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Chris 
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon
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