Lately I have found a oil spot on the garage floor under my lotus. It looks like it leaks for a bit and then stops. Maybe only after the car was driven. Now the strange thing is the location. It is on the passenger side halfway between the rear wheel and the door. When I look underneath, there is the underbody there and in the center it does have oil on it. The oil is clear, and I checked the engine oil which is fine. Any idea where this is coming from?