This Swinger 1 lead a life of mystery before I got it so I'm not sure what oil was run in the past. I suspect it was run dry at least a couple of times because this side cover leaks quite happily (fingers crossed motoseal fixes it for the track day). I've run standard type F.
I think I may just grab a new clutch from Treats since I need to order headset stuff anyways.
Thank you very much for responding! Especially about the bearing!