I think everyone has gone through this.Even my new billet one was leaking.Oil slowly flowing down the ridges on top of the valve cover. Try tightening up the gasket between the tube and the cover. Either a new and maybe thicker one, or what I did since mine was new but just didnt seal good was cut out a washer from some very thin plastic. It was thin enough to install, yet thick enough to tighten up the fit and seal better. Good luck, youve got to be innovative with these cars.