2009 BMW X5 Owner's Manual - Page 247

Fuel specifications Gasoline engine: required fuel Do not use leaded gasoline, otherwise damage to the catalytic converter will result. Do not use E85, i.e. fuel that consists of 85% ethanol, or Flex Fuel, otherwise permanent damage to the engine and the fuel supply system will result.< BMW X5 with BMW Advanced Diesel: Required fuel Ultra-low sulfur diesel The engine of your BMW is designed for diesel with a low sulfur content: Ultra-low sulfur diesel ASTM D 975-07a. Refuel only with ultra-low sulfur diesel. The percentage of biodiesel in the fuel must not exceed 5Ξ, referred to as B5. Do not refuel with gasoline. If the vehicle has been refueled with incorrect fuel such as gasoline, do not start the engine; otherwise, there is a danger of engine damage.< After incorrect refueling, contact a BMW Sports Activity Vehicle Center. The fuel filling neck is designed for refueling with diesel nozzles. If the nozzle cannot be inserted into the fuel filler pipe of your BMW, please check to make sure that you are refueling with a diesel fuel pump and whether this is equipped with a diesel nozzle.< Super Premium Gasoline/AKI 91 This gasoline is highly recommended. However, you may also use gasoline with less AKI. The minimum AKI Rating is 87. If you use gasoline with this minimum AKI Rating, the engine may produce knocking sounds when starting at high outside temperatures. This has no affect on the engine life. Do not use gasoline below the specified minimum quality, otherwise engine damage can result.< Use high-quality brands Field experience has indicated significant differences in fuel quality: volatility, composition, additives, etc., among gasolines offered for sale in the United States and Canada. Fuels containing up to and including 10% ethanol or other oxygenates with up to 2.8% oxygen by weight, that is, 15% MTBE or 3% methanol plus an equivalent amount of co-solvent, will not void the applicable warranties with respect to defects in materials or workmanship. The use of poor-quality fuels may result in drivability, starting and stalling problems especially under certain environmental conditions such as high ambient temperature and high altitude. Should you encounter drivability problems which you suspect could be related to the fuel you are using, we recommend that you respond by switching to a recognized high-quality brand such as gasoline that is advertised as Top Tier Detergent Gasoline. Failure to comply with these recommendations may also result in unscheduled maintenance.< In order to assure the operational reliability of the diesel engine, during cold seasons, please refuel with winter diesel, which is sold at fuel stations during this time of year. The standard fuel filter heating prevents the supply of fuel from stalling during driving. Do not mix in any additives or gasoline; otherwise, there is the risk of engine damage.< BMW X5 with BMW Advanced Diesel The concept BMW Advanced Diesel reduces nitrogen oxides in the diesel exhaust of your vehicle by injecting the reducing agent diesel exhaust fluid into the exhaust line. In the catalytic converter, a chemical reaction occurs that minimizes nitrogen oxides. 245 Online Edition for Part no. 01 41 2 600 792 - © 09/08 BMW AG Reference Mobility Communications Entertainment Winter diesel Navigation Driving tips Controls At a glance