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Years ago I checked the dash oil level gauge on my '15 911 by refilling at oil change with 7 quarts, driving until the oil was hot and taking a reading (just on the first pip on the gauge). Then add a quart, drive, & take a reading (a little above 1/2 on the gauge). Then add a 9th quart, the factory re-fill recommendation (right on the last pip on the dash gauge).
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