Some lawn mowers don't have an oil drain plug.To change the oil in
those, you have to suck it out with a vacuum pump or turn the lawn mower
upside down.It naturally makes more sense to have an oil drain plug on
the bottom.I won't ever buy a lawn mower that doesn't have an oil drain
plug on the bottom.Next time you go lawn mower shopping be sure it has
an oil drain plug on the bottom.
cuhulin