I find that hard to believe but shall give you the benefit of the doubt GG
There's always a film of oil on the bores on any engine otherwise recip donks would have a life span of a few hrs at best:-)
Just for the record filling an engine via the normal filling point technically won't necessarily fill the bores if the rings/pistons are in good order. You would have to fill each pot via the spark plug opening.
It would take an inordinate amount of effort to fill an engine completely with oil but would be worth it for extreme long term storage.
Wmk2