Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Prevents dust and other foreign matter from entering the engine
Prevents rain water from entering the engine
Reduces the engine's air intake noise
Controls the engine's air intake volume

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Automobile Engineering in ME
The function of oil control rings is that it

Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Lubricates the cylinder wall by releasing oil from its hole
Maintains a seal and prevents escape of burned gases and oil leakage
Keeps the cylinder wall lubricated by holding oil in its channel

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