If you have oil in the intake - it can only be caused by a defective CCV system or excessive crankcase pressure. Oil in the intake should not be considered normal and reduced to as minimal amount as possible. From there you should look for other engine problems if still concuming excessive oil.

The CCVs adjust the vacuum accordingly (if they work as designed) - They are vacuum actuated with no outside influence other then crankcase pressure.

The pressure control valves regulate the crankcase pressure to a low 0>30 mbar.
N62 = 22 mbar vacuum
N62 TU = 25 mbar vacuum
20" (Torr) = 26.66 mbar vacuum