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I know this has been discussed ad nauseum and everyone has their own opinion. But I just came across the below link with a little more info on the subject. I thought others would like to see it as well. IMO, there's no such thing as too much information.
Keep in mind this information is on the main page and is subject to change. So at some point the link will become invalid. If that's the case, just click on the link and look in the articles section for one titled Crankcase Oil Levels.