If it is a Mk1 or 2 then you really don't need to do anything. Old original Mk3's, just turn the drums once a week. Mk3's and L1A1/2's. No need to do anything as they are assembled with graphite grease.
If you live in a tropical part with great humidity you could unscrew the desiccation screw/seal and leave with a desiccation bag in a sealed plastic sandwich tub