Filters are the unsung heroes under your hood, trapping dirt that would otherwise grind, clog or burn critical parts. Knowing what each filter does—and when to replace it—keeps engines healthy and wallets happy.

1. Engine Air Filter

• Purpose: Removes dust and debris before air enters cylinders.
• Change Interval: 15,000–30,000 miles, sooner on dusty roads.
• Symptoms of Clogging: Reduced power, lower MPG, black smoke from exhaust.
• Quick tip: Hold the filter up to sunlight; if little light passes through, it’s time for a new one.

2. Cabin Air Filter

Though not engine‑related, this filter cleans air entering the cabin. Replace every 15,000 miles or once a year to cut allergens and bad odors.

3. Oil Filter

• Purpose: Traps metal shavings and soot in engine oil.
• Change Interval: With every oil change—usually 5,000–7,500 miles for conventional, up to 10,000 miles for full synthetic.
• Skipping it can send grit back into freshly poured oil, shortening engine life.

4. Fuel Filter

• Purpose: Stops rust, dirt and water in fuel from reaching injectors.
• Change Interval: 30,000 miles for older cars; many newer models house long‑life filters inside the tank, rated for 60,000 miles or more.
• Clog Signs: Hard starts, stalling under load, slow acceleration.

5. Transmission and PCV Filters (Bonus Round)

Some automatic transmissions use a replaceable filter when fluid is serviced. The PCV (positive crankcase ventilation) valve also acts like a filter; checking both during regular maintenance prevents hidden wear.

Small filters defend big parts. Stick to recommended intervals—or ask our techs for a quick check—to keep airflow pure, oil clean and fuel steady. Your engine will thank you with smoother miles.