am I overthinking this?

[flynrider]

I change mine hot, so it's thin and drains better. On top of that I usually find something else to do for an hour or so while it drains. At the last change, I filled with 1 gallon and it came out just below the upper fill line in the window.

I'm a bit paranoid about overfilling. On a few occasions over the years, I've miscounted and added an extra quart. This was soon followed by leaking gaskets (and oil in the airbox).