I live in New Hampshire. My mechanic recommends an oil change in the fall or right before you put it away for the winter. He doesn't like the bike sitting with the old oil for months. I followed his advice for the first year in '08. However, I have been putting the bike away with the old oil for the winter and then first thing in Spring I have the oil changed. I usually find a day here and there to ride during winter anyway. What do you guys say about this? Does it really matter? It probably is better his way. But, the way I am I would change it in the fall and Spring. I think that's probably over kill.