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


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M30B35
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Was told to use premium 89 octane gas only this true?


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HI! I have a 2005 BMW 525i check engine light is on. Troubleshooting code is (P0011) Engine shaking very bad please help


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Premium 91 or 95


Hello Joshdhorz,

The best fuel you can use on your vehicle is any octane that contains at max 10% ethanol.

Ethanol is an alcohol-based fuel additive made by fermenting and distilling crops that have been broken down into simple sugars.

A 10% blend of ethanol and gasoline will not harm any engine or fuel system component. However, the ethanol has a cleaning effect that will remove rust and other junk from the fuel system. This necessitates frequent fuel filter changes until the fuel system is cleaned out.

Most gas stations in our area are set like so:

87 octane (Up to 10% ethanol)
89 octane (Up to 5% ethanol)
91 octane (No ethanol)

Now we do not have 93 or 95 octane available to us here, so I am currently unsure as to what is in 95 octane fuels. In my opinion, I would use 91 octane (No ethanol) for the majority, while adding 87 or 89 octane (5-10% ethanol) ever so often to clean the lines.

I hope this helps you out,

Shadow

Also if you would not mind taking a moment out of your day and rating my solution it would be greatly appreciated. Thanks in advance!


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IDLING PROBLEM


try replacing your spark plugs

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