The PCV system is to prevent harmful emissions from the crankcase breather (mainly piston blow by) being vented to atmosphere, by recirculating them via the inlet manifold. All modern cars have this system.
The crankcase vent is taken from a high point in the crankcase, well above the oil level., so, for engine oil to be burnt at an excessive rate, that oil has to be forced into that vent, With normal oil levels in the crankcase this seems, to me, to be unlikely.to happen. The oil separator is there as a safety precaution, so that in the event of oil entering the PCV system, it will be separated, and drained back into the crankcase.I don't think it's intended to deal with the sort of volumes we're talking about.
In normal operation no oil should come anywhere near the crankcase vent.
If it does, I'd look for the root cause, wrong oil/overfilling etc,
If oil is trapped in the separator, the separator return must be blocked, But even then, that doesn't explain how that much oil got there in the first place..
Mac.