Nothin' like an oil debate to bring out opinions. Visit the gas engine some day and ask about amsoil vs generic 32:1. Heh.

Break in with what you'll fly. If you're really concerned, add an oz or 2 of castor oil to the engine's first gallon to add a measure of protection. I do this for my 1/2a engines, but don't bother with the 25 and ups. More critical is that you don't over-lean the engine, ever, but especially during that first gallon.

Run a tank or 2 or 3 on the ground, and once you get reasonably reliable running, finish the break in in the air, where it'll be done best, at varying RPM's and power settings. Just run a tad rich, and avoid prolonged nose-up situations (avoid hovering!)

Nothin' too it really, have fun! There's a dozen ways to do it, most work well, some are more trouble than their worth. That engine will be killed by the ground or a lean run eons before you wear it out in normal use anyway.

J