Can oil-based hazer liquid be used in the X-310D?

I bought one used and while cleaning it I realized there is oil residue evident on certain areas of it, particularly the container. I thought this was only a water-based fazer. Does it have a heater/compressor in it and is it safe for them to have done that? I was only planning on using the green water-based stuff with it for a variety of reasons, chief among them not wanting to mess it up.
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