My Honda VTR bike calls for the first oil replacment at 600 miles and then every 7,500 miles. My Honda Civic calls for its' first replacement at 7,500 miles and then every 7,500 miles. Well, I don't follow directions too well so my first oil change was at 250 miles. The next at 1000 miles, then 2500 miles. Looking back I'd say I wasted a bunch of oil and a couple of filters. But why is there such a large difference between the bike and car on the first oil change?