Good to hear you cleaned out the flame trap. Some owners/dealerships are known to remove the plastic screen altogether. The logic is that the trap is less prone to get clogged. I personally would purchase the screen and put it back. It's there for a reason (eliminating potential backfire). All hoses leading into the trap should be clear of debris. Replace your air filter and you should see the last of oil getting into the airbox. I clean my trap twice a year, and I always find crap in there. Most folks clean the throttle body at the same time.