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I recall reading something (might have been the owner's manual) that spoke to the variations of oil level over time. It said that frequent short trips cause fuel dilution of the oil, which would increase the level or mask the degree of oil consumption. It went on to say long high speed trips burn off (vaporize) the fuel dilution and make it appear that the oil was consumed on the trip.
Personally I don't worry about oil too much unless I see a leak or smoke out the tailpipe. A continuing pattern of 500 miles/qt would get my attention though. My recently acquired 2000 S doesn't appear to use much if any oil and it has over 100k miles on the odometer.
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