I've had tires that sat and were flat and needed air and held it after I filled them but that is kind of besides the point. Also Freon was more of a general term.
I looked at the condenser and it is black but didn't really have an oil stain on it so I might have to take a closer look at it when I get a chance and look at it more because I don't really need to do anything with it at the moment I was just looking for some info about it for when I do it.