How often should the air filter and cabin air filter be replaced?
3 Answers
Air filters should be replaced approximately every 15,000 kilometers. In cases of severe haze or willow catkins, the replacement interval should be shortened. Cabin air filters should be replaced every 10,000 to 20,000 kilometers or about once a year, depending on the vehicle's usage, driving environment, and air quality. If the environment is particularly poor, humid, dusty, or in a fog-prone city, the replacement interval should be appropriately shortened. The air filter, fully known as the air filter element, is located on the side of the engine under the hood. Some air filters are cylindrical and are also called air filter cartridges. They are used to filter the air entering the engine, removing dust particles to provide clean air for the engine's combustion chamber, primarily to protect the engine. The cabin air filter is generally located behind the glove box on the passenger side, though in some models, it is under the windshield's air deflector. It filters the air entering the cabin through the air conditioning system, removing external dust when the system is in recirculation mode, mainly to protect the vehicle's occupants.
I've been driving for over 20 years and feel that paying attention to the timing of air filter and cabin air filter replacement is crucial. The air filter mainly affects engine air intake – if left unchanged for too long, dust buildup can restrict airflow, leading to increased fuel consumption and reduced power. I usually inspect it every 15,000 to 20,000 kilometers, replacing more frequently in dusty urban traffic conditions. The cabin air filter impacts in-car air quality, especially during heavy AC use in summer. Unchanged filters accumulate dust mites and emit odors that may trigger allergies. I recommend replacing the entire set annually or every 20,000 kilometers – don't wait until the engine sounds abnormal. In areas with poor air quality like industrial cities, more frequent replacements protect your vehicle and save on repair costs.
As an off-road driving enthusiast who frequently tackles mountainous terrain, replacing these two filters depends on the landscape. When driving on dirt roads with heavy dust, the air filter might need replacement every 10,000 km—otherwise, clogged intake can suffocate the engine. The cabin air filter follows a similar logic; if off-roading leaves a musty smell when turning on the AC, replace it early for fresh air. On highways, intervals can stretch to 20,000 km but never exceed three years. Note that filter materials vary in cost—I opt for OEM parts for affordability and durability. Regular swaps prevent breakdowns and reduce allergy risks, especially for families with kids.
