I have just had a discussion with the my Honda service department about leaving the orginal oil in until after 5000 miles. Third time I have had this discussion. They are adamant about leaving it in until it is over 5000 miles. The V6 severe change interval is 3750 and they still insist on 5000. It is hard to figure why they don't want my money. My question is does anyone know where Honda gets their information on why this is best?