You can find all sorts of opinions on the subject, and no agreement whatsoever. Use whatever floats your boat, and you'll probably come out OK. Just a comment, though- - - - -"non-detergent" oil isn't approved by the API for use in any kind of engine, regardless of age. If the American Petroleum Institute doesn't like it, I'm sure they won't be impressed by the opinion of a bunch of stovebolters.

Before you try to start that engine, I'd strongly suggest you do a Stovebolt site search on the subject of waking up an engine after a long period of non-use. It's a lengthy process if you do it right.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!