dont freak out yet, i had the same issue and the oil on mine turned out to be from the gas splashing out of the carb. its worth a check before tearing into it.
I just bought a nice Renthal R-1 chain (520) for my 2007 Rev 3 and now the chain rubs on the rear brake pedal. I've tried to adjust the brake with no luck and have moved the masterlink to the inside. The old chain didn't rub to the best of my knowledge. Any advice would be greatly appreciated.