How frequently should air filters be inspected or replaced?

The recommended frequency for inspecting or replacing air filters is typically every 12,000 to 15,000 miles or as needed. This interval allows for the assessment of the air filter's condition based on driving habits and environmental factors, such as dust and pollen levels. As air filters can become clogged with debris, it is crucial to check them periodically to maintain optimal engine performance and fuel efficiency.

Option B emphasizes the importance of both mileage and the specific needs of the vehicle's operating environment, ensuring that the air filter is not neglected or replaced unnecessarily. It reflects a more flexible, condition-based maintenance approach compared to rigid mileage recommendations.

Alternative suggestions such as every 3,000 to 5,000 miles might lead to premature replacements, resulting in unnecessary expenses, while changing the air filter every oil change or once a year could miss the chance to replace a filter that might need attention sooner based on driving conditions or increased dirt buildup.