Describe a potential consequence of running an engine with low oil.

Running an engine with low oil can lead to increased friction and potential engine seizure. Oil serves as a lubricant, reducing friction between the moving parts of the engine. When the oil level is low, there is inadequate lubrication, which can cause the metal components to come into direct contact with each other. This increased friction generates excessive heat, which can deteriorate engine parts and lead to overheating. If the situation worsens, it may result in the engine seizing, where moving parts lock up due to the extreme conditions caused by inadequate lubrication.

The other options, such as improved fuel economy, enhanced engine performance, and reduced emissions, do not apply in this scenario. In fact, a lack of sufficient oil typically leads to poorer engine performance and increased emissions due to incomplete combustion and overheating. Therefore, maintaining the proper oil level is critical for the engine's function and longevity.