I bought a new 300EX about 3 weeks ago. I've been able to put on about 8 hours of riding time and have a quick question. How often do most of you guys change your oil? I know the user manual says one change at the 20-hour mark, then 80 hours later. That seems a bit long to me. Both the 20-hour and the 100-hour interval. My oil is a dark brown and the level is a little low (I put in about 1/2 a quart to bring it back up). Not below the bottom mark, but lower them when I first purchased it. This tells me that it's burning some oil. Although I don't see any soot on the back fairing and the oil doesn't feel gritty or smell funny. Is this normal? Any help is greatly appreciated.