Quote:
Originally Posted by Schrade
Working on oil change - and thinking on oil that remains after drain.
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Just spin on a new Oil Filter (after you have changed oil) and fire it up 
I do not concern myself with Oil Not Drained.....as I will get most of that next oil change and more of the older oil after the next next oil change
See Changing Engine Oil
I doubt the engine will suffer at all from running a bit of old old old oil that takes several oil changes to remove.
Now on the Differential.......
I did add the differential drain plug for the simple reason that
NEW Removable Plug is at the bottom of the Differential and much easier to get any contaminants that settle removed by gravity vice sucking wherein you might not be sure where you are sucking from exactly.
See Item #4 LT5 Added Systems