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4130Higher Octane Issues

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  • ldsports808
    Jan 29, 2006
      Hello all!

      I recentley put 89 octane(US) in my 528e when I normally use 87 octane
      (US). I noticed that my idle dropped from around 900 rpm to around
      650. It kind of feels like it wants to shut off. It is a kind of

      Since I filled the car up with 89 I am just waiting to refill it with
      87 to see if it makes a difference. But does anyone have any ideas if
      higher octane gas can cause this.

      Mark (1986 528e)
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