The aFe MagnumFLOW Air Filters OER P5R A/F P5R BMW X5 xDRIVE 35d 09-11 L6-3.0L (td) is a direct replacement air filter designed to provide superior airflow and filtration for your BMW X5 xDRIVE 35d 09-11 L6-3.0L (td). This air filter is constructed with a four-layer synthetic media which provides maximum filtration efficiency and superior flow. Its Pro 5R oiled media is designed to increase air flow up to 45% over stock filters, providing improved performance and fuel economy. Additionally, the filter is designed to last up to 50,000 miles before cleaning is required.