A/C Compressor Swap

Sorry for the late reply (not really a conversation forum like Snapchat). I am sure someone has used HC refrigerant in an RV2 compressor. I have used HC for decades in my 65 Newport which still has the York compressor as-bought (common retrofit, dealer?). That is also a 2-piston compressor. Indeed, all compressors I have seen have pistons and flapper valves (Sanden, R4, ...), so same basic compression technology. Even if not, I have no idea why that would matter. HC is compatible with all oils, including the factory mineral oil. I would drain out any PAG oil (used w/ R-134A) since it absorbs moisture (to cause corrosion). Hella's PAO 68 is the best oil choice today, for any refrigerant.