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

Returns cylinder head lubricating oil to the oil pan at high speed
Removes impurities from cylinder head lubricating oil
Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes
Turns oil into fine mist for spray lubrication

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Returns blow by gases from the crankcase to the intake system
Feeds blow by gases to the exhaust manifold
Mixes fuel with air
Promotes combustion by creating a swirling movement in the air-fuel mixture

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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
Maintains a seal and prevents escape of burned gases and oil leakage
Keeps the cylinder wall lubricated by holding oil in its channel
Lubricates the cylinder wall by releasing oil from its hole

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