I recently contacted Mollenhauer directly and asked them how I can determine which models/woods are paraffin impregnated. I received the following reply:
All wood is impregnated before starting to form a recorder. During the manufacturing process the surfaces are cleaned of paraffin and the inner bore is oiled (with some models also the outer surface).
From this, and other informational videos on their site, I gather that the bore of ALL of their recorder woods can and should be oiled, more or less frequently. The outside only required if non-varnished and non-lacquered. varnish looks more like high gloss finish whereas oil looks more like a matte to satin finish.