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  #1  
Old 04-26-2005, 02:28 PM
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Premium Unleaded?

Do I have to use premium unleaded in my '05 X5 or can I use regular unleaded?
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Old 04-26-2005, 02:30 PM
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I think the minimum you can use is 91... I think people HAVE used lower octane ratings, but I don't think it's good.
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Old 04-26-2005, 02:44 PM
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None of the BMWs I've owned have ever run properly on anything but premium.
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Old 04-26-2005, 02:47 PM
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All BMW's are optimized for high octane (premium) gas, that includes the sotware (the chip) that runs your car. Putting lower octane in your car won't break it, but your car wil not run as well, and you could void the warranty. Also keep in mind that you won't save money on gas as well since your overall milage will go down as well... Cheaper gas= Lower milage (if your car is optimized for higher one, of course).
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Old 04-26-2005, 04:44 PM
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There is some discussion In This Thread as to whether lower octane gas is good or bad for the X5.
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  #6  
Old 04-27-2005, 09:56 PM
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Actually the octane level does not effect gas mileage. Additionally, your engine management software will adjust detonation for the lower octane level.
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Old 04-27-2005, 10:03 PM
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"Additionally, your engine management software will adjust detonation for the lower octane level."


If that is the case then why bother stating in the manual to use min 91?
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Old 04-27-2005, 10:55 PM
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Because that is what the software is optimized for from the factory... It will adjust though. Pre engine management software cars would not be able to adjust and you would get knocking in the engine because the detonation wasn't executing correctly.. Modern cars adjust... It would be better of course to use the 91 octane - but of course with what gas prices are...
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Old 04-27-2005, 11:09 PM
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I see. Thanks for the explanation...makes sense I guess. But can you tell me why it would be better to use the 91
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  #10  
Old 04-28-2005, 10:36 AM
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Quote:
Originally Posted by bimmerfan
...knocking in the engine because the detonation wasn't executing correctly..
I don't get this, can you explain.
Jes
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