Fuel specifications – BMW 525i Sedan 2004 User Manual
Page 171
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169
Fuel specifications
The engine uses lead-free gasoline only.
Required fuel:
Premium Unleaded Gasoline,
min. 91 AKI.
AKI = Anti Knock Index.
Do not use leaded fuels. The use of
leaded fuels will cause permanent
damage to the system's oxygen sensor and
the catalytic converter.
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