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How to Change Your Air Filter. To maximize gas mileage and minimize emissions, your air
filter should be changed every six months or 15,000 miles. To optimize savings, change
it yourself. You will need A flat-head screwdriver and a new air filter. Step 1. Park your car
on a level surface in the shade. Turn off the engine and let it cool down. Step 2. Open
the hood and locate the air filter. In most cars, it's enclosed inside a round or rectangular
plastic case at the top or front of the engine. Step 3. Flip open the metal clasps on either
side of the case. If they're stuck, use the flathead screwdriver to pry them open. In
some older cars, you may need to unscrew the cover. Step 4. Pull the old filter out of
the case. Hold the old filter up to the light—if you can see light through it, it's still in
good shape and can be reinserted. Step 5. Slide in the clean air filter. Step 6. Close
the clasps on the case. Step 7. Close the hood—and breath easy. Now your car can,
too. Did you know In the first episode of the TV show Star Trek: The Next Generation,
Lieutenant Commander Geordi's VISOR was actually a car air filter.