I left my Swiss Champ in my fishing tackle box for a couple of years and never used it. When I did, it was hard to open the accessories, especially the blade, but fortunately, I had bought two bottles of Victorinox Multi Tool Oil when I bought my Swiss Champ XAVT and after a wash with warm water, drying and a few drops of Multi Tool Oil on the moving parts, everything eased up and now the accessories open nice and smoothly, just like it did when it was new I also put a drop on every moving part on my XAVT, even though it's still like new after having had it for about six years now.
Although they are referred to as Swiss Army Knives, I rarely use the blades. I use the magnifyer, nail file, scissors and screwdrivers more than anything else. But a word of warning:
Always have a pouch on your belt for your knife, attached to a chain that can be unclipped when you need it, in case someone takes a fancy to it and tries to nick it. There is nothing more embarrassing for a thief than to get caught red handed with your knife in their hands, attached to a chain to stop them walking away with your property. If you don't have a knife attached to a chain in a pouch, I suggest you get one and when you have finished using it, clip it on the chain asap. You wouldn't want to lose a tool that cost you a lot of money, would you?