I guess that's the difference. I tip my mower on its side and move it around different angles to drain it out. More oil must come out of the nooks and crannies when I tip it.My HRN216 has the GCV170 motor. I changed the oil using the Briggs and Stratton oil extractor. I refilled with exactly 12 ounces of oil. I just checked it again (mower has been sitting for 24 hours) and the oil is to the top of the crosshatch. I’m assuming that’s full