Aenema, Brusk's explanation is correct. The PCV system (it's not just one valve) is not active just at idle and low load. At high load you vent to the intake pre-turbo, which will have a slight vacuum. High load is when you are going to have the most pressure build up in the crank.
I also don't buy that the turbo seals if in good condition are leaking. Once they start leaking the turbos should be replaced. There will be some oil in the turbo compressor due to the pre-turbo PCV vent.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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