2008 BMW Z4 M Series Owner's Manual - Page 85
2008 BMW Z4 M Series Manual
Page 85 highlights
The fuel tank is full when the filler nozzle shuts off the first time. Approx. 14.5 US gallons/55 liters, including the reserve capacity of approx. 2.1 US gallons/ 8 liters. Do not drive until the fuel tank is empty. Otherwise, the engine may not operate properly and damage could result.< Fuel specifications Do not fill the tank with leaded fuel, as this would cause permanent damage to the catalytic converter. Do not fill the tank with E85, i.e. fuel that contains 85 % ethanol, nor with Flex Fuel, as this would cause damage to the engine and fuel supply system.< Required fuel 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 effect on the engine life. Do not fill the tank with gasoline below the specified minimum grade; otherwise engine damage could result.< Mobility 83 Online Edition for Part no. 01 41 0 014 500 - © 08/07 BMW AG 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. Reference Driving tips Controls At a glance Fuel tank capacity 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 driveability 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.