I guess oil use is effected by driving style and time between changes. I've had my '09 Z for 3 years and 11,000 mi. and had the oil changed three times now, (every 3,000 mi.). No oil consumption between changes was ever significant enough to be indicated indicated on the dipstick---none. I'm not complaining---just pointing out different situations. I drive pretty gently and I guess that makes a difference.
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