always mix your fuel with your oil before adding it to any machine.
It all depends on you. 4 cycle trimmers do not require mixing of oil and gas. The gas that you use for your lawn mower or tractor is the same gas for your trimmer. They also provide more torque than a 2 cycle trimmer. 2 cycle trimmers require mixing of fuel and gas and are generally lighter in weight than 4 cycle trimmers.
4 cycle mower.... gas is separate from oil!
Look at the engine on your lawn mower. If the engine has an oil filler tube or a "hole" with a cap on it where oil is added to the engine, it is a 4-cycle (4-stroke) engine. If there is no oil filler tube or place to add oil to the engine, then it is a 2-cycle (2-stroke) engine and the oil has to be added to the fuel.
Four-stroke lawn mowers have a tube where you add oil to the engine. On two-stroke engines, oil has to be added to the fuel. (Four-stroke and two-stroke are also called four-cycle and two-cycle, respectively).
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a Mexican without a lawn mower is unemployed
No for your lawn mower you will just need regular lawn mower oil.
Two-cycle lawnmower engines are rare.
The spark plug gap for 2 cycle lawnboys is 0.025
If you put it in for engine oil you will have a major problem. If you put it in with the fuel then you will notice the mower smoking a lot and possibly fouling the spark plug.
Four stroke engines such as lawn mowers etc need only straight fuel. Either leaded or unleaded (depending on age and availability). no oil or other mixing is required
on the fuel line running from the tank to the carb.