Most likely it won't need anything at all as long as it's out of the rain. I've got a lot of parts, including flywheels, that were stored for many years in an unheated garage, with no damage.
However, I've been experimenting with a product from the folks who make PB Blaster, called "Blaster Corrosion Stop". It's basically just a spray grease with a solvent carrier that evaporates; leaving behind a fairly thick layer of grease. But it is readily available around here (Walmart, Home Depot, etc), inexpensive, and so far seems to work very well even on parts that are stored outdoors.
https://www.blastercorporation.com/Corrosion_Stop.html
I've tried other products from various sources, but so far the Blaster product seems to be winning. YMMV