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Oil is mixed with the fuel in a two cycle allowing proper amount of oil into the cylinder for lubrication, which is where the gas to oil ratio becomes so important to two cycle engines. Four stoke engine have no oil in the fuel for lube, they have an internal lube system. Some engines have oil pumps, others have slinger type systems. Has the oil is moving around in the engine in lands on the cylinder walls giving them lube. The oil ring is in place to insure only a small amount of oil is left in place for proper lubrication, as the piston goes up and down.

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Q: Why do 2-stroke pistons not have an oil control ring?
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