Should the water be drained out of the motor after being flushed? If it's empty does that promote rust or does the water staying in the motor keep it from rusting. I usually use salt away everytime I flush my motor. Haven't been able to go out for a month now because working all the time. Just want to make sure new motor isnt sitting idle with rust growing inside her. I know it is anyway but which promotes guicker,in or out?