Some thoughts:
1. Check the oilpressure sending unit. Had one go bad and it started leaking.
2. What about oil out of dip stick tube, or valve cover breather? Think it would be easy to see there but maybe not.
3. Can you see if it is running down the side of the block or out at bottom. Could you have just lost the rear main seal?
4. Check dipstick, are you loosing oil? Is the filter on tight? Made this mistake once.
5. You didn't take off the head did you? Are there any bolts in the system recently replaced that were not used with thread sealer?
Hope you find it. Don't know if this will be any help at all. Good luck.
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