Yesterday at the handling day I noticed a couple of oil spots in the donut area, and after checking my car saw it was me! The oil was dripping from the bottom of the Apollo tank, so I parked up and gave everything a double check. Oil was not leaking from the unions, the sandwich plate or the temp sender so it had to be sump plug, the that seemed to be nice and tight. After a while, and wiping everything down, I ran the engine to see if I could see where the drip was originating and... Nothing. Couldn't find a thing. Sent my friend off to carry on enjoying himself, and checked every time he came back, and still nothing. Got home after a long drive, nothing. So what could it be? Were the vigorous donuts something to do with it? Did the tank overheat and the sump plug loosen, and tighten as it cooled again? Confused...