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Whatever leaks tends to blow back until it hits something, then it drips off and you see it drip, but not the sourse. Rather like a leak in a shingle roof.
You likely have a leaky rear main seal. This is a labor-intensive repair as it requires removing the transmission. BUT, there's a low cost patch.
The crankshaft front and rear main seals are not designed to hold against much pressure, and, in normal operation there isn't any. If the positive crankcase ventilation system becomes clogged, then the normal pressure build-up in the crankcase is not released, and that pressure blows one or more seals. The usual spots are the rear main seal, front main seal, camshaft seal or intermediate shaft seal. Only the rear main seal is a big cost.
SO, check your PCV system. The flame trap and hoses, and the brass ferrule on the intake manifold must be clear for the system to work. There is a test, I call it the palm test. Remove the oil filler cap with the engine running and cover the hole with your palm. You should feel a vacuum pulling in on your palm, at idle speed and at higher engine speeds. Obviously this test is more comfortable is done on a cold engine.
I have experienced that cleaning the PCV system can stop a rear main seal leak if done quickly so the seal damage is minimized. Leaky front seals give another problem. Oil on the timing belt causes it to deteriorate quicker than usual. Check for oil leaks on the front, too.
Good Luck,
Bob
:>)
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