When I was surprised at my first oil change (200 mile) to get only 3 cups m/l in, I figured it was 'cause I didn't drop the screen. So, next change (400 mile), I measured what came out (still didn't pull the screen). Got 22 oz. Both times the dip stick (not screwed in) showed the level above the halfway point on the grid. I had the dealer do the next oil change with grid removal at 600 mile for the break in checkup. I checked the oil afterward and it was, as before, above the halfway point on the grid. At 1600 mile, changed the oil myself including dropping the screen. Measured what came out. All told, 23 oz. Refilled with 23 oz, and, as before, measured above the halfway point on the grid of the dip stick. Added another 2 oz, and oil spilled over the edge. I don't think it's possible for me to get any more in. Incidentally, my owners manual does not warn against overfilling engine oil or gear oil.
Stopped by the dealer to order a spare air cleaner, and forgot to ask about the oil capacity. Maybe next time I'm there I'll remember. Anyway, thanks to you guys for your attempts to help.