Re small oil drip

[Ron61]

I have a small oildrip in my 428SJC that has been there from when I bought the car new. After a major rebuild and everything it is still there. I have tried every method I know of to trace the source and no luck. Drip falls from the clutch bracket mounting which is behind and above any oil bearing part of the engine. Also some right at the left side of the inspection plate which is also above the oil pan. This is being blown back by the wind and the only other place I have ever found a wet spot weas on the 4th oil pan bolt on the left side, but nothing around it is even damp. Block is very clean and I can't find even a light film of oil anywhere on it and the leak is always on the left or drivers side. I first suspected it may be out of the adapter for the oil cooler but that is bone dry. Just leaks a drop or so a day for a week after I drive it. And always from the two spots mentioned above. The oil gets in behind the bracket and cover and takes time to all seep out. Not a big thing, but I think I have heard of a dye that you can put in the oil to look for this kind of minnute leak. If so, will it work with the Mobil 1 Synthetic 15/50 racing oil? Or did I just imagine that I have heard of such a dye? thanks for any help or ideas.

Ron