Quote:
Originally Posted by vtknight
With the M5 it would not be a slight difference in power/performance going from 93 to 91 octane. The increased boost in the F90 would not survive 91 and the computer would retard timing significantly to save itself. There was recently a 991.2 Turbo S versus the newest 992 GT3 and they were almost equal as the Turbo S was on 91 - that is a major performance hit. So - and I doubt it - IF the magazines have been using 91 instead of 93 - the F90 is going to run mid 10's at 132+ MPH lol.
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I think RON 95 / AKI 91 gas is acceptable at least on the F10 M5, according to the
S63B44 technical training document. I haven't seen any evidence that this would change in the T4 revision of the engine.