Hi Eric,
Apologies, I should have included in my first post that I did check the dip stick. It is halfway between what I assume are the cold and hot fill marks on the dip stick. There is no visible sign of leaking around the oil filter, oil fill tube, or dip stick. I will check the drain plug tomorrow. I would think if it were the drain plug it would be a constant leak, not just a momentary leak when I shut the engine down that is maybe a cup or 2 in volume and then stops. Am I missing something?