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E90/E91/E92/E93 (2006 - 2013)
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Old 05-11-2012, 06:16 PM
The X Men The X Men is offline
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2012 535i, 89 octane min requirement

I notice that the 2012 535i has a min octane requirement of 89. Does anybody use 89, 91 or 93. Does the engine have more power and get better gas mileage using the 91 or 93 octane gas.
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Old 05-11-2012, 06:56 PM
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tturedraider tturedraider is offline
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The engine is designed to give optimum performance with 91 octane.
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Old 05-11-2012, 11:25 PM
BMW220i BMW220i is offline
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Quote:
Originally Posted by tturedraider View Post
The engine is designed to give optimum performance with 91 octane.
Is this true or just to make Californians feel better as most can only get 91 octane, at most.

Will optimal performance be achieved with 93 octane, which is close to the 98 octane found in many European countries (which uses a different way of measuring octane, hence the higher number)?

High octane often results in better gas mileage but not enough to completely justify the higher cost in terms of fuel economy. Octane requirements are lower with cold weather so it may make sense to use 89 octane in the middle of winter, particularly if there's a lot of snow of the ground making fast driving dangerous. Of course, that might only be 2-3 tankfuls so one would save only $5 at most.
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Old 05-12-2012, 12:15 AM
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tturedraider tturedraider is offline
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It's not just to make Californians feel good.
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Old 05-12-2012, 07:47 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by The X Men View Post
I notice that the 2012 535i has a min octane requirement of 89. Does anybody use 89, 91 or 93. Does the engine have more power and get better gas mileage using the 91 or 93 octane gas.
Yes to both.

It's a matter of ignition advance....the higher the octane [rating], the more advance engine software will provide. Correctly done, more advance = more power per quantity of fuel; better mileage is a result. Limit of advance is set by the knock sensor or max allowed. Can be chemically achieved, and/or simply by cooling turbo compressed air.

Tuners change parameters, sometimes taking the user out of emissions compliance. Thus, some are officially recommended only for offroad use. I want to see a chipped 3 config'd for offroad use....
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Old 05-12-2012, 10:53 AM
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need4speed need4speed is offline
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IMHO you save enough in fuel running 93 to make up the price difference on buying 89. Plus the motor is working to it's full potential. N4S
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