Anything that’s being stored gets either slip 2000 or mineral oil wipes on real light, usually a dot at the pivot too because those always seem to have or get rust. I just work it in then wipe off the excess. My daily drivers I just use, leave open in a safe place to completely dry then back in the leather roll for next time. A couple I’ve had in there unused for extended periods of time with no oil and have had no issues. I live in a pretty mild area, my guess is relative humidity hangs around the 50% percent area most the year.