I use the Enviro-safe in my Bonnewagon. But it only came in a can with R-134 fittings, so the service fittings needed to be changed from R-12 to R-134. It could be in there, you don't know. The Enviro-safe can use mineral oil, and I left the OEM mineral oil in my system, just topped it off for a new compressor. But R-134 would have had the oil changed to the PAG oil. So if you can identify the oil in your system, you will know what freon is in there.