I know a lot of people use after run oil, Marvel Mystery Air Tool oil was my choice but I was still not 100% satisfied with the results, especially with ball bearings or even Fox's with bushings. I'd still get an occasionally stiff or locked up engine, or "crunchy" bearings from dried oils.
So one day my cousin is walking me through some clean and lube on an antique clock of mine and he has me apply mineral oil with the tip of a small pin to some brass gears, and he goes on to explain all the wonderful properties of mineral oil and how it won't absorb atmospheric moisture, etc. Well, the light went on and I decided to experiment.
So, a year ago I put a Fox35 and a ST60 in storage with a few drops of mineral oil in the intake and exhaust, flipped them hard several flips and made sure I got it spread around and stuck them in their factory boxes in a drawer in my hot humid Florida garage.
Took'em out of their boxes today and gave them a few flips, and still nice and free on the Fox, and the ST60 bearings are smooth too.
Anyone else use mineral oil? I'm probably not the first, but I thought I'd share this anyways. Seems to be a winner.
Later,
EricV