FWIW, just got back from a 4,500 mile "road trip" that took me back and forth (several times) over the Rockies in the US and Canada. My current mileage is 16,767. My Z was broken in according to the manual. I'm running Mobil 1 and a stock Nissan oil filter. The last oil change was at ~10,400 miles. I checked the oil level prior to, during and at the end of the trip - no oil consumption.
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