That's what I'd do. I'd fill it that much, then check a few days later. If it was "a lot" above F then next time I might try 3.5 quarts instead and see if it winds up just below F--if it did that, then I'd do 3.5 quarts going forward.So, if an engine calls for 3.7 quarts you should be safe using 4 quarts?
Aeration is a fear, sure. But think about this: when the engine is started, the oil level is at its highest. Once started, the oil level drops as it's pumped here and there. If it doesn't aerate at start up then I doubt it would any other time. Dipsticks are not precision measurement instruments, who knows how much slop there is in one, where it mounts and all that.