There is a fill plug on the side of an RV2 AC compressor. Does the oil in that part of the pump mix with the refrigerant when charged? I know when a system is evacuated and charged oil and refrigerant are added back... just didn't know if there was an isolated oil section for the "bottom end" of the v twin like RV2 compressor or if everything co mingles.... just trying to get a better grasp on the RV2.

If everything co mingles was wondering how the compressors rotating assembly retains lubrication during an evacuation/charge period?