I changed mine a lot in the beginning (1000, 3000, 6000, 10000... ). I enjoy doing it (when the weather's nice), and don't really worry too much about the extra money. I feel good about getting the early stuff out, but there have been some posts about break-in fluid put in by the factory, that should be left in place for a while. Don't know whether this was ever confirmed, you may want to search for the posts. Maybe someone will chime in.