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Thermodynamics 21 Online
OpenStudy (anonymous):

can anyone pls tell me why does engine oil become black inside the engine ???

OpenStudy (anonymous):

The black substance is mainly carbon and other very small particulate matter. The oil lubricates metal parts that are in contact. Inside the engine, the piston rings make a tight seal and remove some of the oil that has undergone decomposition in the combustion chamber.

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