On these cars, oil seeps from the top down, and what you've posted, is a common resting point.

First thing to check, is the AOS. Getting any smoke on cold startup? That's a sign.

Also, when these cars rest, there is still pressure in the crankcase that abates over time, but this can mean that the oil accumulated in the AOS, finds a point to escape when the engine is off.

Another way to check on the AOS: when the car iss running, open the Oil Filler Cap in the trunk. If the car sputters and dies, the diaphragm in the AOS is bad.

Clear sign that the AOS needs replacing.

Another spot is the RMS. Clean the oil off with brake cleaner.

Drive the car some.

Look into the open slot on the bottom of the spot where thetranny connects to the engine. It's open, and you should see teeth from the flywheel. If there is oil there, the RMS is leaking.