How do you change oil in weedeater push mower?

Usually on any push mower you can drain the oil through the dipstick tube by turning the mower on its side and draining into a pan. Then flip it back up and refill to the full mark. I'm guessing that it is a 3-6 hp Briggs engine, meaning that it will take approximately a half quart of 10W-30 or 30 SAE oil.