I had checked the dipstick after adding a quart following the low level warning on the dash, and found it was still a quart low. So the sensor had triggered, but a bit late so it was replaced. That was at about 310,000 miles. At least you're starting our with 8 when it's full! But I'm more inclined to check the dipstick now. Makes me worry a bit about the CEO's 428i that has no dipstick
2002 X5 3.0 371,000 miles
2014 428i 66,000 miles
2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles
1970 Firebird Under restoration