Accord 4cyl sedan. Honda service manager told me first oil change for V6 was 4000 miles...5000 miles for the 4 cyl. He said Honda uses a special conditioning oil in their new engines and not to change it until the specified mileage. I drive a stretch of freeway to and from work everyday so I drive anywhere from 65 to 80 mph. Took a 200 mile trip the day after I picked up the car and drove at normal highway speeds. I avoided full throttle starts and took it easy on the brakes for a few hundred miles. Other than that no special break in. At 4700 miles the car is running quiet and smooth and I average about 34 mpg.