Why is it essential to regularly change the air filter in a vehicle?

Regularly changing the air filter in a vehicle is essential to ensure optimal airflow to the engine. The air filter plays a critical role in filtering out dirt, debris, and contaminants from the air entering the engine for combustion. When the air filter becomes clogged or dirty, it restricts airflow, which can negatively affect the engine's performance.

Optimal airflow is necessary for the engine to maintain the correct air-to-fuel ratio, leading to more efficient combustion. If airflow is reduced, the engine may struggle to draw in enough air, resulting in poor fuel efficiency, reduced power, and possible long-term damage. Additionally, a well-maintained air filter contributes to lower emissions, as it helps the engine operate more cleanly.

In comparison, the other options do not accurately reflect the primary purpose of the air filter. Overheating of the engine is more related to cooling system issues, tire performance depends on tire condition and pressure, and buoyancy is unrelated to vehicle function. Thus, maintaining a clean and efficient air filter is critical to preserving engine health and performance.