Do your bikes get louder and run rougher when an oil change is needed? I've put 2000 miles on the bike since I bought it at the end of June. The previous owner changed it before selling it to me but I don't know how many miles were on it. He used Golden Spectra (not synthetic) It looked pretty clean. I rode 331 miles Monday through the mountains of Vermont & New York so I immigine that was pretty tough on the engine. The oil is dark brown (you can still see through it a little bit) but it idols a little rough and the motor sounds a little louder then usual and it isn't shifting as smooth. I'm assuming an oil change will be the cure. I only have 6800 miles on the bike. And while I'm at it I'm changing the plugs as well. I'm going to try Maxima Maxum 4 synthetic blend and a new stick filter & stock plugs. I'd appreciate any feedback from you guys. Thanks in advance.