I would agree with the above post. I would wait until 600 miles for the first oil change and not longer than 600 miles for the same reason. Factory oil is usually formulated for engine break in, you should wait until 600 miles to give the rings a chance to seat, etc. you shouldn't wait longer because you want to drain any fine metal particles from the manufacturing and break in. I used conventional oil for first oil change and changed at 1200 miles, to ensure adequate break in time and just to give the new engine a second flush. Then I switched to full synthetic changed again at 4200, afterwards following the recommended 4000 mile interval. I'll take my chances that the manufacturer knows their engines better than others do.