How Often Should Air Filters and Cabin Air Filters Be Replaced?

[FaithLynn]

According to the vehicle maintenance manual, the air filter should generally be replaced every 10,000 to 20,000 kilometers or during every other maintenance service, while the cabin air filter should be replaced every 10,000 kilometers or approximately once a year. It is recommended to inspect both the air filter and cabin air filter during each maintenance service. The location of the air filter varies depending on the intake design and engine structure, but it is typically housed in the air cleaner assembly connected to the engine intake pipe. The cabin air filter is usually located beneath or inside the glove compartment on the passenger side, though some models may position it below the windshield in front of the passenger seat. The cabin air filter and engine air filter serve distinct purposes and are not interchangeable. Air Filter: This is a filtration device, also known as an air cartridge, air cleaner, or air element. It is primarily used in engineering vehicles, automobiles, agricultural machinery, laboratories, sterile operating rooms, and various precision workspaces. During engine operation, large volumes of air are drawn in. Without filtration, airborne dust particles entering the cylinders would accelerate wear on piston assemblies and cylinder walls. Larger particulates entering the piston-cylinder gap can cause severe cylinder scoring, particularly in dry, sandy environments. Automotive air filters come in two types: dry (made of paper or organic materials) and wet (made of metal mesh). Their primary function is to remove particulate contaminants from intake air, ensuring sufficient clean air reaches the combustion chambers while preventing dust ingestion that accelerates engine component wear. Cabin Air Filter: Installed in the vehicle's HVAC system, this filter captures fine particulates, reduces respiratory irritation, minimizes allergen exposure, and protects the cooling system. Without filtration, these particles would contaminate the HVAC system, degrade cooling performance, and pose health risks including allergic reactions, lung irritation, ozone-induced discomfort, and unpleasant odors—all compromising driving safety. There are two main types: standard cabin filters (typically white single-layer constructs of processed, pleated eco-friendly material) and activated carbon variants (comprising non-woven fabric layers sandwiching granular activated carbon). Clogged Air Filter Consequences: A severely dirty air filter restricts engine airflow, causing incomplete fuel combustion that leads to unstable operation, reduced power output, and increased fuel consumption. The air cleaner assembly—comprising one or more filtration components—removes harmful airborne particulates to prevent premature wear of cylinders, pistons, rings, valves, and seats. Intake air must pass through this filtration before entering cylinders. Excessive contamination can cause poor engine performance, abnormal fuel consumption, and engine damage. If inspection reveals light dust accumulation, cleaning with compressed air (blowing inward to outward) may suffice; otherwise, replacement is necessary. Clogged Cabin Air Filter Consequences: A dirty cabin filter obstructs airflow, diminishes AC cooling efficiency, increases fuel consumption and noise levels, and shortens HVAC system lifespan. Accumulated contaminants foster bacterial and mold growth, potentially causing health issues for occupants, including serious illnesses in severe cases.

[Toby]

I drive quite a lot, so I usually replace the air filter and cabin air filter every 15,000 kilometers or annually. If you don't change the air filter for a long time, it can clog the intake tract, affecting engine breathing and fuel consumption. Last time I forgot to replace it, not only did the car accelerate noticeably slower, but fuel costs also shot up. The cabin air filter needs even more regular attention—it filters out dust and pollen, protecting the air quality inside the car. Otherwise, over time, turning on the AC might produce weird odors or the airflow won’t feel fresh. Once I got lazy and delayed replacing it, and my family in the back seats kept complaining about itchy noses. Changing these filters yourself isn’t hard—you can buy one online for a few dozen bucks, remove the old one, and slot in the new one. If you’re unsure, just spend around a hundred at a shop to get it done. Remember, in dusty environments like construction sites or cities with heavy smog, replace them every 10,000 kilometers—don’t skimp on these small costs and risk damaging your car’s heart.