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I wouldn't worry about oil consumption, there would be other obvious symptoms long before that happened. PCV systems are an oily, sticky mess even when functioning properly. Check the inlet tube post-MAF for oil residue, or after the air cleaner for some models. You can also put a separate air filter on the rear inlet tube to the PCV if you want to get creative. Not technically correct, but most PCMs can compensate for the small difference in airflow metering. Consider a catch-can in line from valve to intake as well. PCV systems over time will still gum up parts of the upper intake, and in some cases allow uneven air and vapor distribution to each cylinder.
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