BMW Air Filter E46 325i/330i, X3 2.5i/3.0i, Z4 2.5i/3.0i

Your BMW's air filter is intended to clean the air entering the intake before it gets into the engine. Throughout thousands of hours of operation, the air filter can become clogged up by dust and other debris which will significantly decrease airflow into the engine. In addition, a clogged air filter can also allow smaller particles through into the engine causing additional wear and tear. recommends regular inspection of your engine's air filter and replacement every 30,000 miles. We recommend shorter inspection and replacement intervals in dustier environments.