Automobile Engineering in ME
The lubrication oil flow in an engine is in the order as

Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan
Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan

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

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