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Clean: Oil takes excess carbon and dirt not removed from exhaust and run it through the oil filter until it is time to change.

Cool. Oil takes heat from near the cylinder where spark plug ignites the fuel that generates heat. Some heat is removed via exhaust gases. Some by fins on exterior of cylinder or by water enclosed in special

Lubricate. Lubrication is oils main function. the better the lubrication, the less heat generated by friction which helps fuel efficiency, lengthens engine life. It helps the engine quieter too.

Seal. Oil fills the gap between piston, rings & cylinder wall to help maintain compression so when the spark plug ignites the air fuel mixture it does not lose energy to blow by.

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Q: What are the 4 purposes or functions of oil?
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