Automobile Engineering in ME
The function of a second ring is that it is a

Back up oil control ring which will work in place of the bottom ring when it is broken
Back up compression ring which will work in place of the top ring when it is broken
Cushion ring which prevents piston slap and knock
Compression ring and aids the top ring in sealing and cooling

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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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