This past weekend, I took my 08 450 XC-F out to my local track, and after riding for about an hour, I go back to my truck to refuel and rehydrate and notice a very noticeable amount of oil on the right side of my engine case. At first glance, there was so much oil I thought it was just mud and water from the track, but it was indeed all oil. The oil seems to be coming from the spark plug weep hole. I didnt have my manual with me, but I stopped by my local KTM dealership on the way home and I told him I just replaced the rubber gasket around the spark plug shaft, #9 in the diagram. http://www.motosport.com/dirtbike/oem-parts/KTM/2008/450%20XC-F/?modelyearid=1118&typeid=1&groupId=59019 The guy I talked to said that if I didnt seat that gasket perfectly, that could be why I am leaking oil, but once I cleaned my bike and could see into the sight glass, there was very little to no oil left. In other words, I would say I lost about 90-95% of my oil. Could that gasket really be the problem? I was thinking more like a worn head gasket or seal somewhere. I really dont think I would lose that much oil from that gasket being out of place.