If owned a car that had a fuel dilution issue I would fill the oil to a bit below the full mark at each oil change, to allow for a rising oil level due to the fuel dilution. How much below the full mark would depend on how bad the fuel dilution issue was.
I haven't seen a fuel dilution problem on my particular cars, so I make sure that the cold oil level is never above the full mark, and don't worry about the hot oil level being a bit above that.
I haven't seen a fuel dilution problem on my particular cars, so I make sure that the cold oil level is never above the full mark, and don't worry about the hot oil level being a bit above that.