BMW 650i Coupe 2006 - Manual (Page 184)

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Fuel specifications
Never used leaded gasoline; it will perma-
nently damage the catalytic converter.
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Required fuel
Premium unleaded gasoline
The minimum Octane Rating is 91.
If you use gasoline with this minimum Octane
Rating, the engine may produce knocking
sounds when starting at high outside tempera-
tures. This has no effect on the engine life.
Minimum Octane Rating corresponds to the
Anti Knock Index AKI and is determined accord-
ing to the so-called (R+M)/2 method.
Use high-quality brands
Field experience has demonstrated significant
differences in fuel quality: volatility, composi-
tion, 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
problems relating to drivability and start-
ing, 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.
Failure to comply with these recommendations
may also result in unscheduled maintenance.
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