I just bought a 99 WR400. I love the bike, it's got balls. It has been 5 years since i've ridden. The last bike was an 83 XR500. I would just put gas in it and go. I just read the owners manual for the new bike and the maintenance required is insane. Does anyone have any recommendations for motor oil types, oil filters, how often in between changes, etc.? What about air filters? It has a foam filter right now. Should I buy an after market filter? How often should it be cleaned and lubed? Any advice you can give me will be appreciated. I don't race, but I ride very hard when I go out. I also live in a very hot, dry dusty climate. Pahrumped Nevada. 99 WR400, FMF Pipe, DMC Header, Renthal bars, Moose fender bag, Baja Designs Light kit, Accerbics brush guards, Scott's Stearing dampner, IMS clear 4.1 gal. tank. Still learning about all the mods.