Why is it important to check the air filter during an oil change?

Checking the air filter during an oil change is important primarily because it directly influences engine performance and fuel efficiency. The air filter's role is to prevent dirt, dust, and other contaminants from entering the engine's combustion chamber. A clean and functional air filter allows for optimal airflow, which is essential for the engine to operate efficiently. When the air filter is clogged or dirty, it restricts airflow, resulting in a richer fuel mixture that can lead to poor combustion, reduced power output, and increased fuel consumption.

Regularly inspecting and replacing the air filter as part of routine maintenance, such as an oil change, helps ensure that the engine receives the right amount of air for combustion, thus maximizing both performance and fuel efficiency. This preventative measure not only contributes to smoother operation but also extends the engine's longevity by reducing the likelihood of damage from contaminants.