If you are unsure what type of engine your lawn mower has, you can check the owner's manual or look for the oil fill cap. If there's a single fill cap, then you have a 4-stroke engine, which uses regular motor oil. If there are two fill caps, one for the engine and one for the transmission, then you have a 2-stroke engine, which uses a mixture of gasoline and 2-cycle oil.
2-cycle oils are specially formulated to provide adequate lubrication for the engine and also to ensure fuel and oil reach all the nooks and crannies of the engine.
It's important to use the correct type of oil in your lawn mower to ensure it runs properly and lasts a long time. If you have a 2-stroke engine, be sure to mix the gasoline and oil in the correct ratio according to the instructions in the owner's manual.
