I also have a 2000 S, currently with 26,000 miles. It burns very little oil...I have to "top off" the oil once or twice between 6,000 mile oil changes (less than a quart of oil added in total). If it's not leaking on the ground then it will have been burned during the combustion cycle or leaking into the cooling system. No clouds of smoke? Oil clean (not the color of coffee)? Just thinking out loud here...
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