How to Change Engine Air Filter: 1986 BMW 520i 1.6L 4 Cyl.

The engine air filter in your 1986 BMW 520i cleans the air that enters your engine. You should change the filter on your 520i 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 520i 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 520i and how to change it!In addition to improving the fuel economy of your 520i, 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 520i, you can easily swap it for a new one if it is dirty). Be sure to adhere to a recurring schedule for your 1986 BMW 520i replacement.