Changed the stock crap out today, just as has been written here before, the "oil" had turned to thick gooey sludge and there was some dime sized corrosion spots on the thin damper piston tube. (towards the top 1/3 so I think I'm OK). Took awhile to get the old stuff out it was so deteriorated. This is on a 2004 bike with less than 700 miles on it. If you have a XR-650 and have not changed the factory fork oil you are wrong! I used AMSOIL medium weight suspension fluid and the forks seem much more plush.