How to Change Engine Air Filter: 2009 Cadillac STS V 4.4L V8 Supercharged

The engine air filter in your 2009 Cadillac STS cleans the air that enters your engine. You should change the filter on your STS at least once a year or every 20,000 miles, whichever comes first. If you drive in dusty or sandy conditions, you should change your filter more frequently. A dirty air filter will cause your STS to lose 1 - 3 mpg, depending on your driving, you can save 70 - 100 gallons of gas per year simply by changing your filter regularly. The video above, shows you where the engine air filter is located in your STS and how to change it!In addition to improving the fuel economy of your STS, regularly replacing your air filter will put less strain on your engine. These filters are fairly inexpensive, so check out our parts page for great deals and coupons on a new one (tip: buy several, when you go to check the filter on your STS, you can easily swap it for a new one if it is dirty). Be sure to adhere to a recurring schedule for your 2009 Cadillac STS replacement.