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Old 07-31-2014, 02:45 AM   #17 (permalink)
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If you left the oil in the engine, it would still be good for however long your oil change interval is.
So draining it out and putting it back should have no effect, if you can keep it clean. It just isn't a thing that is usually done, hence the 'natural' reaction is to think of drained oil as the same stuff that comes out at regular oil changes.
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