Mine will take about 2.6L after an oil and filter change. I usually start by pouring 1.9L (2 quarts) into the tank, then running it for a couple of minutes until I see that the return line is happily bubbling. At that point, oil is added to bring it up to the "Lo" mark on the stick. The manual may be quoting for a level brought up to the "Full" mark on the stick.
Nathan