Larry's 62,
Back in the mid-70's we had an oil leak on some Kawasaki Z900's. It was driving us crazy because when you put hot oil on an air cooled engine and drive it in the wind...it goes EVERYWHERE! One of us had heard of using Phosphorescence in oil to make it more visible. We tried mixing some into oil and it showed a milky cream appearance under a black light we'd bought from a "head shop". We then went to lunch and checked it again when we returned. The Phosphorescence had settled out and the oil looked as white as paper! We cleaned up the engine well and took it for a short ride and were able to pinpoint the offending area.
Seems they had stopped using thread sealent on some cylinder studs due to galling on installation. The threads were open into the crankcase and the oil was "wicking" it's way up the studs and out at the headgasket level!
Short story long...try cleaning it really well and get a blacklight to see from whence the oil cometh! Some areas sell what they call Scorpion flashlights to find Scorpians. It should work eqaully well on oil leaks!
Hope that helps.