Mine was at least at the top of the sight glass when I got it. I figured it was close so I didn't get too worried about it. I drained, rocked and everything else at 600 miles. It ended up taking almost all of a gallon to fill it to the top mark on the sight glass. My owner's manual does not say 3.4 quarts, it says 3.9, which is 3.7 liters.
2010 Vulcan 900 Classic LT, 2007 SeaRay 185, nine children, one wife.