Thankfully I pulled the dipstick the other day before I ran the start-up procedure.
It was bone dry!
The second-to-the-last time the oil was changed was in Long Beach, and besides putting in 5W-30 instead of 10W-30, they used a gasket on the drain plug that was too big, and didn't seal properly. When my son and I changed the oil last fall, I reused the gasket, as it looked "OK" to me. Over the last 10 months, it's been dripping slowly, and lost ALL the new oil we put in. Just happy I had cardboard and carpet scraps under the car, but I'm going to have to pressure wash "my" side of the garage. Since I use the pressure washer to wash the car, I'll give it a try when I have the car out in the next day or so.
Trip to the auto parts store got me a selection of new gaskets, AND a magnetic oil drain plug, which I was going to use. With the magnet on the new plug, it goes into the oil pan far enough to hit the oil pickup, meaning I can't tighten it, meaning I can't use it.
Oh, well.....One of the gaskets in the kit fit the OEM plug, so that went back in, with the new gasket.
It's been holding a pan full of oil for about four hours now, and not a sign of a drip. I'll run the car tomorrow, and check again after I shut it down to see if it dripped any after warm up.