Filters and airflow
Filters
Engine air, cabin air and fuel filters explained, including how climate and road dust change timing.
Typical interval: Every 12,000 to 15,000 miles
Filters protect two separate systems: the engine's air intake and the air that reaches the cabin. Both fill gradually, so the decline in performance is easy to miss until airflow is noticeably weaker.
A cabin filter announces itself through reduced vent airflow on the highest fan setting and sometimes a musty smell when the fan starts. An engine air filter is a visual check: hold it up to light and look at how much passes through the pleats.
Dust, pollen, gravel roads and construction routes shorten filter life considerably. If your commute includes any of those, treat the mileage figure as an upper limit rather than a target.
What to check
- Compare vent airflow on maximum fan against last season
- Hold the engine air filter to a light source
- Match replacement parts to your exact model year
- Shorten the interval for dusty or gravel routes
Also worth knowing
- Spotting a clogged cabin filter by airflow
- Why dusty routes shorten filter life
- Order of inspection during a service visit
AutoLab Maintenance publishes general vehicle maintenance information. Our guides, checklists and reminders are informational only and do not replace your owner's manual or the judgment of a qualified technician. Always follow the manufacturer service schedule for your specific vehicle.