The engine air filter keeps debris and particles out of the engine's intake air.
A clogged air filter can restrict airflow to the engine, which may affect performance and efficiency. Replacement intervals are usually defined by mileage or time, whichever the manufacturer's schedule specifies.
Driving in dusty conditions can shorten the useful life of an air filter compared to typical paved-road driving, which is why some manufacturers list a separate interval for special conditions.
Your vehicle's applicable interval is shown on its own maintenance schedule once sourced from manufacturer documentation.
This page explains the service in general terms. It does not state a mileage or time interval, because the correct interval depends on your vehicle's manufacturer, model, year and configuration.
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