Most "name brand" oils nowadays will work just fine unless you are really pushing the engine (eg, racing). Even the dino-based oils are far superior to the ones from 20-30 years ago. Go with a good synthetic or semi-syn and quit worrying. LOTS of posts on this site about the subject; search is your friend.
Edit: Keep changing it before storing every year. Acids, condensation, etc can build up over time.
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