I called my dealer and talked with the mechanic. They can't get me in right away and with my schedule, how close to 600 miles can I go over. He stated a few hundred over was no big deal, and they need a weeks lead time to schedule. And he need to look up schedules for the 650 to make estimate. I guess I'm first one they're going to service. Any input on how many miles over 600 is OK?