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you would need to be pushing a lot of crankcase pressure to exceed turbo pressure, wouldn't you?
even with a check valve, it seems dodgy.
I think that is why they go pre-turbo in the stock configuration, that's the closest thing to "vacuum" that you find in the intake system.
if you filter the oil out of the crankcase vapors, it should be pretty clean air. Maybe traces of unburnt fuel, but only traces.
This is a guess. I don't know the answer.
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