I just read the article in the new Snow Tech about Doo switching to the orange long life anti freeze in their new sleds and it got me wondering if anyone ever checked the recommended change interval for the coolant in their sled? I can't say as I've ever changed it just for the sake of changing it because the manual says so,even when I've had a burn down I always try to catch as much as possible to put it back in when the engine goes back together lol.Lets face it the stuff is just too expensive to drain every few years and besides that there isn't any place locally to take used coolant.