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I believe the only source of that much oil is the turbo oil feed tube. The way to test it is to remove the intake and start the engine. If you have copious amounts of oil coming out of the cold side of the turbo, there is your problem. If you also remove the exhaust downpipe from the turbo, you should see oil there as well (it would not be getting there from the intake). I doubt the valve seals can pass that much oil, and the engine still run. Besides, turbo engines have positive pressure in the intake tract, and the seals try to keep boost pressure out of the crankcase. Bad valve seals in a turbo will cause so much blow-by, that you would notice it. I doubt you need to pull the head. Just my $.02......Rich
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