When we stored our Honda S2000 for a few years, after changing the oil, we filled the tank with non-ethanol fuel that we found at a local boat marina and Stabil. Had a friend enter the storage space and ran the engine about once a month. Placed rags in the exhaust pipes so that open valves could not get fresh air into the cylinders.
Coming out of storage, we again changed the oil, and filter. No problems,other than sticky throttle linkage.
Our diesel boat engine was always stored with a full tank with a bioside added. A full tank keeps the freeze thaw cycle from condensation making water and algea.
I like the idea of closing down the exhaust pipes to keep fresh air from entering...... good suggestion. I also am inclined to agree with the idea of keeping the tank full so that condensation isn’t an issue.