Quote:
Originally Posted by madrye28
Where exactly do you purchase 98/99 octane fuel? And where did you get this info where it states a loss of hp if you put in 93/94 octane? Never heard of or seen 98/99 octane in any of my local gas stations. With that said, I doubt knock sensors are going off in a car because it’s not filled with impossible octane gas, that would be a ludicrous expectation on BMW’s end, especially in reviewing the owner’s manual in which it recommended 91 or higher for maximum performance.
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Most gas stations here in The Netherlands, give you 2 options;
Standard E5 95 Octane gas
or
Supreme E10 98 Octane gas
If you let you car Chiptune, they also advise to fill up with E10/98 Octane for best engine results and HP/NM gain.