Milidon oil pan

It’s highly unlikely leaking from the pan rail. More probable it’s coming from the pan end seal and/or rear main seal (likely one, not both) and wicking. You gotta drive it, immediately park the car and get under it, degrease the pan rail, block and gasket edges. Let it sit a day or so and check it periodically and see if oil reappears to decipher where it’s coming from. At least that’s how I’d start the investigation