I took it in to the dealer since it was under warranty. They degreased everything, put a florescent dye in the oil, then the next dayused a black light type thing to look for leak sources.
They about crapped their pants. 4 individual sources.
They opened up this little "sight port" between the torque converter and the motor. Clearly could see a substantial leak from the rear main seal. Its a weird little metal door that lets you see between the two. Kinda odd, never seen it in any other car.
The pan gasket seepage was very clear too. Dry everywhere nearby except for about 1" of dampness under the gasket.
Additionally, the gasket between the oil filter adapter and the engine block showed slight seepage, as well as slight seepage on the valve cover.
The motor is spotless (16,500 miles) and so it was easy to see leakge points.
Anyways.... I (and they) were ready to basically put a new motor in it. I needed the car for work, so I made an Appt. to return in 4 days. That night I changed the oil to the "good old" dino stuff I used previously.
Next morning I found just a few drips on the floor. I hosed everything clean with brake cleaner, then the car wash.
By the 3rd day, not a single drip, seep, or slight dampness.
The dealer (and me) are still shaking out heads in disbelief.
We both seem to think I must have got a bad batch of syn. oil or something.... it was just too weird.