Why is maintaining regular oil changes important for emissions control?

Maintaining regular oil changes is crucial for emissions control primarily because it promotes optimal engine function. When engine oil is fresh and clean, it effectively lubricates the engine components, reducing friction and enabling the engine to run more efficiently. This efficiency translates to better combustion processes, which leads to lower levels of unburned fuel and harmful emissions being released into the atmosphere.

An engine that operates optimally has a more complete burn of fuel, minimizing the production of hydrocarbon emissions and other pollutants. Regular oil changes also prevent the buildup of sludge and contaminants that can hinder engine performance, further supporting a cleaner, more effective operation.

The other aspects mentioned may contribute to engine performance, but they do not directly aim at emissions control as effectively as ensuring that the engine runs at its best capacity through proper lubrication.