I put fresh oil in a lawnmower about two years ago and it has sat unused since. Does the oil need to be replaced even though the engine was not started once? I know there may be some water condensed in there but when I start it up again won't it just burn off in 30 minutes or so? Does anything else occur to degrade the oil if it is not used but is exposed to air that can't be burned off next time it is run? Can I run it this year with the old but unused oil or should I put in a fresh quart before I start using it?
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