· Premium Member
So you let it drain for many hours so all the oil in drained out. So the oil galley, bearing and other parts are drained and dry. You then fill it with oil and start a motor that is dry until oil gets pumped thru the motor. Thing that would do more damage than an little left over oil from before the change. When building a new motor many will pump oil thru the motor before starting to prevent dry wear and damage. So people question on letting a motor set for a long time and then starting it as the oil has settled to the bottom.