Break-in is important to ensure correct engine performance and life. Even though many of us have stated in the forum that you can run the engine at full throttle after five minutes, the official answer is to follow the procedure listed in the Engine Operation, Maintenance and Warranty Manual which usually states don’t run at full throttle for the first 2 hours, then only briefly until 5 hours and always vary the throttle level during operation the first ten hours.
Generally, for the first two hours, we recommend avoiding extended idling, sustained periods of wide open throttle, or holding the engine at one speed for extended periods of time.
Use 87 or higher octane, 91 or higher for the performance engines.
Change your oil, lubricate all drive points and check the belt tension at 20 hours. This is the single most important thing you can do for your engine and drive.