So after about 15 mins of driving I notice an oil smell in the cabin. I did add oil a few weeks ago but this smell was before that. There are no leaks that I see or spots on the ground. What could be the issue? I thought possibly an exhaust leak at the header but that is unlikely as I would smell exhaust. I am thinking maybe a vacuum tube leaking some burnt oil? Its going to drive me nuts if I cant figure out how to fix it. Anyone have some ideas?