I'd vote for using a suction gun and pulling the old oil out the fill hole. It's easy, fast and not too messy if you're careful. I'd still do the job on a piece of cardboard, because you'll dribble some. I've been doing it that way for some time.
Using the drain plug on a push mower is a PIA. Tipping it to drain it would be too much work for me and I know I'd make a royal mess with that method.
Using the drain plug on a push mower is a PIA. Tipping it to drain it would be too much work for me and I know I'd make a royal mess with that method.