[V6-12v] Very Mysterious Oil Leak

[Mancubus]

  Hi All.  I fixed my CEL problem which turned out to be a loose wire on the
passenger side O2 sensor.  Thanks to those of you who pointed me in the
right direction.

 

Now for my next problem:


I am experiencing a very strange oil leak.   When the car is parked on a
slight slope with the nose pointing downward, I come back to my car and find
a puddle of oil.  I.E. a grape fruit sized spot is obtainable in just a 1
hr. period.  If I park the car with the nose facing uphill there is no oil
leak whatsoever.  I can leave the car parked for days and not experience a
single drop.  If I turn the car around it will start dripping immediately.
I've tried to take a look to see where the oil could be coming from but I
don't see any obvious signs.  From under the car, the leak appears to run
off the front of the transmission. There are some dark spots on the engine
block but they appear to be oil mixed with dirt and not the fresh stuff I'm
seeing on the ground.  I've checked the engine oil level and the leak does
in fact affect it.

 

I'm calling on the collective wisdom of this group to help me figure out
this mystery.  Does anyone have any ideas as to what would cause this?
Where I should start looking?

 

TIA!

 

Trevor

'95 Audi 90 Quattro Sport