Sealing effect
Sealing effect is one function of engine oil.
In engines, although the cylinder wall and compression rings are
used to seal and compress the combustion chamber, engine oil is
used to block the spaces between the cylinder wall and
compression rings to complete the sealing effect and prevent the
combustion gases from blowing through the crankcase.
By doing so, decreases in engine output and oil deterioration
caused by unburned fuel are prevented.
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