4 hp
Depending on model and manufacturer, about 6.5 horsepower.
about as much as a lawn mower
It depends on the size of engine it has
about 5hp
6 HP
Stop feeding it beans!
It may weigh about 75 pounds
1.5 quarts
Go to the drain plug and let some out
More horsepower means a faster mower that cuts better at higher speeds. Lower horsepower is generally better for smaller yards or thinner grass.
Most of these products just varies in their power ratings. Some of the commercial ones are just way bigger and more powerful than the regular ones because they were made specifically for tougher jobs. A commercial lawn mower is much bigger than a regular riding lawn mower. A commercial lawn mower is meant for larger lawns and it generally costs more.