Which of the following is NOT a function of motor oil?

Motor oil serves multiple crucial functions in an engine, and one of its primary roles is to lubricate the moving parts. This lubrication minimizes friction and wear, allowing for smoother operation and longevity of the engine components. Additionally, motor oil plays an important role in preventing corrosion by creating a protective film on metal surfaces, thus shielding them from moisture and other corrosive elements.

Another critical function of motor oil is to aid in temperature regulation. It helps to prevent overheating by dissipating heat away from the engine parts, maintaining optimal operating temperatures.

However, motor oil does not fuel the engine. Fuel is a separate component that is necessary for combustion in the engine, while motor oil's function is solely related to lubrication, corrosion prevention, and temperature control. Thus, it is clear that the option referring to fueling the engine is indeed not a function of motor oil.