My '21 GTR just hit 10,000 miles. Between 5800 (my second oil change) and 6900 miles it used almost a full quart and the warning light was on. I was doing a very long trip to Florida, 900 miles at highway speeds (70 +mph) and A/C. I topped it off and the light went off. There was no noticeable usage on the return trip (highway speeds, but no A/C this time). Bothersome. I have an appointment for the valve stem seal repair, however...
Just changed the oil (and filter, of course) and refilled with about 4.8 quarts. Waited an hour because oil drains into the pan very slowly in this car. The dip stick reads in the middle. That's curious because in the two previous oil changes it always read full. I interpret that to mean it's down a half quart. Added the last .2 quart in the jug and it still reads in the middle. So, 5 quarts added and it's not full. Any ideas?