The aFe MagnumFLOW Air Filters OER P5R A/F P5R BMW X3 05-10 / Z4 06-08 L6-3.0L is an oiled air filter designed to provide superior performance and protection for BMW X3 05-10 and Z4 06-08 models with a 3.0L L6 engine. The oiled filter media is constructed with five layers of progressive synthetic media for maximum convenience and efficiency. It is designed to provide maximum airflow for improved performance and excellent engine protection from dirt and other contaminants. The filter is easy to install and maintain, and is backed by a million mile limited warranty.