No expert here but these are my thoughts:

Wipe it down regular gun oil (this takes what? 1 minute) Get the inside of the barrel clean before it sits awhile. Take the thing apart and give it a thorough cleaning...not because it's necessary but because 1. It can't hurt (just don't over oil things so that it get gummed up later) 2. Its good to "get to know your rifle" (however corny that may sound) and three because, again, this will take what? 20 minutes tops. I see it this way...once a year making a 1/2hour investment of time on a product/tool/heirloom that you invested 500+ maybe 1000+ dollars in doesn't sound foolish at all. As to the question about "special" care for stainless. I'm not aware of any special treatment needed.