I had a brain fart and put close to 4 full quarts in mine at the last oil change and it too filled the sight glass, wasn't about to dick around and try to drain enough to get level between the sight marks. As has been pointed out, S10 is a dry sump system so I'm not losing sleep if it's a cup-and-a-half over, it's not like oil windage or other wet sump issues are going to be a problem. She's been fine for almost 5000 miles and at last check a few hundred miles ago there wasn't any oil puddled in the air box.