Automobile Engineering in ME
The engine oil level should be checked

While the engine is running at high idle speed
Immediately after the ignition switch is turned off
While the engine is running
A few minutes after the ignition switch is turned off

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Creates swirl
Increases the combustion temperature
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Maintains a seal and prevents the fuel leakage

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