BMW 745i Sedan 2005 - Manual (Page 189)

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Fuel specification
The engine uses lead-free gasoline only.
Required fuel
Premium unleaded gasoline,
minimum octane rating: 91
Minimum octane rating corresponds to the
Anti Knock Index AKI and is determined
according to the so-called (R+M)/2
method.
Do not use leaded gasoline, as other-
wise the lambda probe and catalytic
converter will be permanently damaged. <
Use high-quality brands
Field experience has indicated significant
differences in fuel quality: volatility, compo-
sition, additives, etc., among gasolines
offered for sale in the United States and
Canada. Fuels containing up to and includ-
ing 10% ethanol or other oxygenates with
up to 2.8 % oxygen by weight, that is,
15% MTBE or 3% methanol plus an equiv-
alent 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 stall-
ing 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.
Failure to comply with these recommenda-
tions may result in unscheduled mainte-
nance.
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