Question about 1991 BMW 5 Series

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Which octane is best?

I just purchased a great running 1991 BMW 535i. Is is best for this engine to have a 93 octane gasoline or can it work well with an 89?
Are there possiblities of creating problems if I use an 89 otctane?
Your expertise is greatly appreciated.
Thank you.
Tim

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I have the owners manual and I thought it said Premium on all EXCEPT the i. I will double check tonight and post back tomorrow.

Posted on Sep 03, 2008

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I recently used 87 grade gas in my 2001 Infiniti I30 and its putting like a lawn mower. Besides the fact of it being a coil pack issue is 93 grade better to use? I had no problems out of 89 or 93


Hey LeDonta,
The octane rating of the gasoline has nothing to do with the "quality" of the gasoline.. quality is purity, quantity of bad "fillers", quantity of good "fillers", and cleanliness of the transportation tanker and the stations tanks in the ground.
the octane rating is a rating of how fast the gas burns in the combustion cycle... the higher the octane rating the slower the gas burns.. and the lower the octane, the faster it burns.. The compression ratio and ignition timing are the main factors in determining what octane an engine requires. The higher the compression ratio and thus, the more advanced the ignition timing, the higher the octane required. Racing engines (as a rule) require a higher octane...
USE WHAT YOUR OWNERS MANUAL SAYS TO USE!!!.. if it says 87,, use it, .. using 93 is a waste of money!!
Want to learn what is actually in gasoline.. read this:
https://en.wikipedia.org/wiki/List_of_gasoline_additives

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Will the engine from a 1988 BMW 535i fit in a 1990 BMW 535i?


Based on wikipedia...yes. From 1988-1993. I copied and pasted the information below:

M30B35
  • 3.4 liter (3430 cc) SOHC inline-6 cylinder
  • 9.0:1 compression ratio
  • 208 bhp / 211 PS @ 5700 rpm
  • 225 ft·lbf (305 N·m) torque @ 4000 rpm
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Applications:
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3.5 L M90 (3453 cc) Applications:
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Was told to use premium 89 octane gas only this true?


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IDLING PROBLEM


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