I have big trouble with PCV OCC:
at night it was cold -20C/-4F, in the morning I went on highway about 600 km, during the trip the temperature was a little warmer than the night, at the end of travel smelled strongly of burnt oil, and in the end lighted oil can, about half of the oil squeezed out through the plastic cover over the engine, the all engine has been oil, I add near 3 liters oil.
At the service washed engine bottom, disconnect the OCC, changed the oil.
Now all OK.
PS/we have cold in winter -30C/-22F to -40C/-40F sometime.