I swapped mine out at the 5K mark when I did an oil change. I don't think you can go wrong with Bel-Ray Gear Saver Full Synthetic 75-90. I actually swapped it out a second time after some miles to get that nasty factory crap out. By the way, I just did my most recent oil change near the 10k mark getting ready to put the bike away for the winter. My bike doesn't use any oil, but I still think the oil I took out was plenty dirty. I would not do the recommended 10k interval oil changes, as I think that is stretching it out to far.