What elements make up the mixture needed for a four-stroke engine to run?

Question

DentroTest · Accepted Answer

Four-stroke engines run on a mixture of fuel and air. The air provides the oxygen that is essential (oxidizer) for combustion to take place in the cylinder during the four phases of the cycle: intake, compression, combustion and exhaust. Unlike two-stroke engines, four-stroke engines have an independent lubrication circuit housed in the crankcase, so they do not need oil added to the fuel. The option that includes oil corresponds to the operation of a two-stroke engine, and it is impossible for an engine to run on pure fuel without air for lack of oxygen.

What elements make up the mixture needed for a four-stroke engine to run?

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