Run the factory oil for 5-7 hours of alternate driving speeds but do not exceed 3/4 throttle for duration of break-in. After break-in change oil using a quality 10W40 or 15W40 V-twin/ motorcycle oil designed for an air cooled engine. The simple reason for this is conventional automotive oil is designed to operate at temps not to exceed 200 degres. Air cooled engines run in excess of 300 degrees. With automotive oil you will have thermal breakdown which will shorten engine life. Doesn't matter if petroleum based or synthetic is used however I am partial to full synthetic, what is important is that you use the correct oil designed for the higher operating temp of the air cooled engine.
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