The main thing I would be concerned about is rust on other components.
Oil will eventually drain down. Turning an over engine periodically may
prevent the pistons and other parts from seizing in the bores, but I've
taken engines down which have developed rust rings in the bores from
where the piston rings stood. That's why I felt the running of the
engine with the starter to replenish the oil in the system might be
prefered.
Another concern is the kind of storage even when inside. Remember the
warnings about keeping fuel tanks full to prevent condensation? It
applies to any closed system. If the engine goes through warm spells in
the winter, condensation can form "sweats" internally. This causes
problems. A work shop periodically heated makes things even worse
especially if heated with a non vented propane or natural gas heater.
That's why changing the oil would remove any moisture that may
accumulate in the sump.
<<<snip>>>
Personally, I would think turning it over by hand once a year is
probably
sufficient. In a moderately dry climate, it could probably just sit in
the
corner of the garage for ten years gathering dust without harm.
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