(1) If it has a dip stick fill it to the full mark.(2) If not usually you fill it to just a bit below the treads under the cap. I you are missing the dip stick from the bottom of the cap unscrew tube and fill same as (2).
If it is a 2-stroke engine, the oil/gas mixture has too much oil. If it is a 4-stroke engine, the oil sump is overfull.
Depends on the size of the mower.
6,250 J
That will vary for each make and model of mower.
It depends on what kind of lawn mower (push or ride). I sell my fixed push mowers usually for $30.
give up and hire a lawn service...
4 hp
10 dollar
about as much as a lawn mower
Check the oil/fuel mix and make sure you have it mixed to the correct ratio. Else, try raising the blade on the lawn mower. If you have the lawn mower blade too low, mowing tall grass, it can make too much work for the mower and will cause it to overheat.
Blue smoke indicates the engine is burning oil. If it is a 2-stroke, the fuel/oil mixture has too much oil. If it is a 4-stroke, there is too much oil in the reservoir or the valve seal are leaking, or the piston rings are worn.
It depends what kind? The push lawn mower about 70 - 80 pounds. The ones that you ride on, those weigh about 200 - 350 pounds!