The oil leak on my Puch was from the exhaust. It was black 'oil'...probably burnt gas/oil mix. I snugged up the nuts, but stripped the stud. Put in a fresh thicker gasket, new studs and nuts...all good. Look closely and see exactly where the oil drips from, if it's from the exhaust nuts/studs, it may just need to be tightened...wipe ALL the oil off, make a run and recheck... be careful though. Good luck.