Just like your body, your car needs oxygen to breathe. The job of your BMW 525 Series air filter is to ensure the oxygen your engine "breathes" is as clean as possible. The 525 Series air filter removes impurities and engine grime from the air entering your combustion chambers, where it mixes with your fuel to provide power to your engine.

Of course, your BMW 525 Series air filter will become clogged over time. The nature of the function of your 525 Series air filter ensures that you will have to replace it.

You should install a new BMW 525 Series air filter at least once per year, and more often if it becomes clogged faster. A dirty 525 Series air filter will result in poor engine performance and a decrease in fuel efficiency. Unfortunately, you can't always tell when your BMW 525 Series air filter is clogged just by looking at it. The 525 Series air filter may appear clean or slightly smudged, but still not be performing effectively. One way to test your BMW 525 Series air filter is to blow through it. If there is only minimal resistance, it is still working. However, if air does not pass through your 525 Series air filter, you should replace it right away. You can also invest in a high-performance BMW 525 Series air filter that is washable and reusable. Browse our online catalogue for a wide selection of 525 Series air filters and performance BMW 525 Series air filters.When you place your order through our secure online server or by calling our toll-free customer service number, we will ship your new 525 Series air filter right to your door.