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Old 02-25-2005, 09:13 AM   #5
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Join Date: May 2004
Location: Denver CO
Posts: 748
I suspect the oil capacity has something to do with the "integrated dry sump" lubrication system, and constant pressure throughout the system, instead of the oil return being essentially under no pressure as in wet sump systems.
The air cooled 911s had an absolutely enormous oil capacity, with a completely separate oil tank that held about 12 qts, and supposedly if you drained the entire oil system, you ended up with about 16 qts! Of course the engine was about as much oil-cooled as it was air cooled, too.
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