Quote:
Originally Posted by CaptainG
...... engine seized day after oil change at a quick lube place. Oil is about an inch over full mark on dipstick but I don't see how this could seize engine.......
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The foaming problems possible with really overfilling come in two modes...
First that pumping air along with oil can reduce the actual amount of oil and the pressure it arrives at the bearings.
Second that oxygen mixed into the oil will reduce its ability to lubricate the bearings. They have calculated the ' half life ' of the oil depending both on the temperature it gets to and the amount of oxygen incorporated.. This can happen with transmission oil also... even without overfilling... procedures like having to rock the car back and forth to get out of a hole by moving repeatedly from reverse to forward can reduce the effective life of the trans fluid to a very short time... enough that it should be changed as soon as possible afterwards..
There are charts where the half life , at temperature increments above a certain temperature, is reduced are shown.