How much is to much oil?

[JMBT]

10.5 gallons puts my CM2250 right in the middle of the hash marks on the stick. I run it there because it doesn’t seem to use any oil at that level. If I put it on the full mark it tends to use a bit. I always try to change the oil myself but for the rare case when I have to use a Speedco, I added a Fumoto valve because they always overfill it and the valve makes it easier to get it right.