Usually none at all.
It depends if it is a 2 stroke or a 4 stroke. A 2 stroke engine, you mix the gas and oil. A 4 stroke engine, there are separate tanks for the oil and gas.
All natural gas engines are 4 stroke. In a 2 stroke engine the oil is mixed with the gasoline. This is not possible when using natural gas as a fuel.
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.
With a 2 stroke engine, you mix the oil with the gas. With a 4 stroke engine, there are separate tanks for the oil, and the gas.
A gas only engine has a spout where oil is added to the engine. If there is no spout, then it is a gas/oil engine. FYI - gas only engine is a four-stroke (four-cycle) engine and the gas/oil engine is two-stroke (two-cycle).
No you do not put oil in the gas - 4 hp Briggs & Stratton motors are 4 stroke, not 2 stroke in which you do have to add oil to the gas.
There is no oil to change in a two stroke engine. The lubricant is the oil that is mixed with the gas.
That would depend on whether the engine is 2-stroke or 4-stroke (aka 2-cycle & 4-cycle). If the engine does not have an oil filler tube, it is a 2-stroke and oil must be added to the fuel. If it has an oil filler tube, it is a 4-stroke and oil is added through the filler tube.
Usually no.
Yes it will work, but not well. If there is not too much of it,it will just burn blacker exhaust and foul up your plugs.
Two stroke gas is just regular gas with oil added. The oil is usually green in color and therefore tints the gas green. The ratio of oil to gas is specified by the engine manufacturer.
Three ounces of Two-Stroke oil per gallon of gas