Why a Dirty Air Filter May Not Hurt Engine Performance
The Air Filter Replacement Myth: Why a Dirty Filter Might Actually Imp
2. What air filters actually do
3. The surprising truth: dirty filters filter better
4. The airflow difference: one to two percent at most
5. The marketing myth that created the panic
6. The carburetor exception that no longer applies
7. The sensor effect: why computers hide the filter
8. The turbocharged complication
9. The visual trap: what dirty really means
10. The correct replacement interval
11. The one exception: dusty environments
12. The final verdict: stop replacing, start inspecting
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Every oil change, the service advisor offers the same recommendation. "Your air filter looks dirty. We should replace it. It"s cheap and it will improve your engine"s performance." The recommendation seems perfectly logical. A dirty filter must restrict airflow. Restricted airflow must reduce power. Clean air is essential for combustion. Therefore, a clean filter must be better than a dirty one. This logic is so simple, so intuitive, that almost no one questions it. The logic is also wrong.