2008 BMW M6 Owner's Manual - Page 203

Fuel specifications Never used leaded gasoline; it will permanently damage the catalytic converter. 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.< Required fuel Super Premium Gasoline/AKI 93 Always use this premium grade fuel to obtain maximum fuel economy and performance. The minimum approved fuel grade is AKI 91. Do not use gasoline below the specified minimum quality, otherwise engine damage can result.< 201 Online Edition for Part no. 01 41 0 014 244 - © 08/07 BMW AG Reference Mobility The use of poor-quality fuels may result in problems relating to drivability and starting, and to a tendency to stall, 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.< Communications Entertainment Field experience has demonstrated 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. Navigation Use high-quality brands Driving tips Controls At a glance