My oil level light came on yesterday at 6961 miles, 3747 miles from oil change.
What makes my case particularly interesting – I checked the oil level fewer than 200 miles before the light came on, and the dipstick read at the top mark. As such, according to the dipstick – my oil level dropped one quart in fewer than 200 miles. There were no problems with oil level up to that point.
I added one quart of 0W20, and the light turned off after a few miles.