So was it was leaking internally with no visible wetness on the outside? My passenger side turbo has been leaking on the outside for the past year. For awhile I thought it was the gasket for the oil outlet. It was replaced, but the wetness was still there on the next oil change. From above, I can see it is a bit wet on the exhaust side towards the cold side. I don't see any blue smoke, though. It doesn't leak enough to drip to the floor either.
So I wonder if it's a clogged PCV from oil blowby. I might get the PCVs changed out ($12-15 each), and get various things cleaned up since mileage is over 57k.
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