Thank you
I figured as much, just wanted to confirm.
Quote:
Originally Posted by Kzang
Apparently you guys don't read the manual...
Recommended fuel quality
BMW recommends AKI 91.
Minimum fuel grade
BMW recommends AKI 89.
Minimum fuel grade
Do not fill up with fuel below the specified
minimum quality; otherwise, the engine
may not run properly.◀
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.
Minimum fuel grade
The use of poor-quality fuels may result
in harmful engine deposits or damage. Additionally,
problems relating to drivability, starting
and stalling, especially under certain environmental
conditions such as high ambient
temperature and high altitude, may occur.
If drivability problems are encountered, we recommend
switching to a high quality gasoline
brand and a higher octane grade — AKI number
— for a few tank fills.
To avoid harmful engine
deposits, it is highly recommended to
purchase gasoline from BP or Top Tier retailers.
Failure to comply with these recommendations
may result in the need for unscheduled maintenance.
To answer your question on the advantages... your MPG will be better and your engine performance will be at maximum when using 91 octane or higher. However, using 89 octane will be fine but you will lose MPG.
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