So I got my first ever Swiss Army Knife 2 months ago. It’s a Victorinox Huntsman with 14 tools (the one with the saw). I have not used it extensively yet, but I wipe it clean every time I use it.
I’m not aware of when and how often I should oil the moving parts and things like that. I would like to keep this knife in working condition for as long as I can.
Sharpen the blades, clean out the pocket lint and maybe a bit of 3-in-1 oil when things are getting too gummed up.
I’ve had my knife for several decades. I did end up getting it replaced once under warranty early on. But, I blame my taking zero care of it and carrying it up sand dunes on a yearly basis. The sand really jammed up the blades.
I’m also going to replace the scales "soon"TM. Said replacement having been planned as “soon” for the last few years. Ya, ya, I’ll get to it.