max fill line prevents a pump from scavenging.
the extremes such as cold, pumping molasses.. doesn't get back to the pan before the pump never stops pumping...(maine is famous for it- keep those pressure reilefs clean..)
and another source is high rpms in longevity, regardless of weather, can cause a scavenge. A common read for this is backyarders making a hot rod out of thier old engine.. big oil pump included...(it could be the number 1 error)
hence some get even bigger oil pans and more oil... it is not to be an anti-ecomodding hog, it is to keep safe, and for a much longer time.. that cycle of more oil lasts longer...common sense.
too low on oil is like taking a bath with a tablespoon of water.
