E60 Discussion Anything and everything to do with the E60 5 Series. All are welcome!
View Poll Results: What octane of gas/pertol do you put in your e60?
The lowest grade available
2.03%
The middle grade
9.46%
I always use the highest grade available
84.46%
Whatever I feel like at the time
4.05%
None, I can't affort to drive my E60 anymore
0
0%
Voters: 148. You may not vote on this poll

The octane you put in your E60

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Old 09-17-2005, 01:42 PM
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We're pretty much stuck with 91 in California... Drives me mad
Old 09-17-2005, 02:21 PM
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Originally Posted by yogibear458' date='Sep 17 2005, 05:34 PM
94 Sunoco - makes a big difference on hot and humid days
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Yup i always fill up when i see a Sunoco, it's too bad there aren't many around.
Old 09-17-2005, 02:22 PM
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Originally Posted by yogibear458' date='Sep 17 2005, 05:34 PM
94 Sunoco - makes a big difference on hot and humid days
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My Sunoco dealers near me are all at 93 Octane for their "Ultra".
It used to be 94 but several years ago they all went to 93.
Not sure if it's my local market or a US thing.
Either way I'd use a higher octane if I could get it.
Old 09-17-2005, 07:59 PM
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Originally Posted by LowOrbit' date='Sep 17 2005, 01:02 PM
I heard somewhere that higher octane gives you better fuel economy, thereby offsetting the cheaper price of lower octane.? Does anyone know if this is true?
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Higher than recommended octane will not give you better fuel economy. The recommended octane is based on the engine's compression ratio. Octane is the component of gasoline that is most compressable. If you use lower than recommended octane, the gas/air mixture in the cylinder will explode too early from the pressure - before the spark ignites it. This used to casue "knock" but today's more sohisticated engines can adjust to prevent this. but you will still lose performance and efficiency. Higher than recommended octane is a waste. It only makes your gasoline more compressable than is required for the engines's compression ratio.
Old 09-18-2005, 01:57 AM
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98 octane or 100 octane here in Europe
Old 09-18-2005, 05:15 AM
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Originally Posted by robg' date='Sep 18 2005, 05:59 AM
[quote name='LowOrbit' date='Sep 17 2005, 01:02 PM']I heard somewhere that higher octane gives you better fuel economy, thereby offsetting the cheaper price of lower octane.? Does anyone know if this is true?
[snapback]171710[/snapback]
Higher than recommended octane will not give you better fuel economy. The recommended octane is based on the engine's compression ratio. Octane is the component of gasoline that is most compressable. If you use lower than recommended octane, the gas/air mixture in the cylinder will explode too early from the pressure - before the spark ignites it. This used to casue "knock" but today's more sohisticated engines can adjust to prevent this. but you will still lose performance and efficiency. Higher than recommended octane is a waste. It only makes your gasoline more compressable than is required for the engines's compression ratio.
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This is not proven right.

There are two groups of people. One say it does, the others say it doesn't.
It's simply WRONG to say that it does or it does not.

A proven fact is, that higher octane is not damaging the engine. And with a possibility that it is better for the engine, it's allways better to use the higher octane fuel... Unless one day somebody can PROVE it doesn't do anything better than the lower octane fuel.

Old 09-18-2005, 07:07 AM
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91 here. It's the highest available octane where I live. :\
Old 09-18-2005, 07:25 AM
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Iceman -

Given the science behind it and why octane is added (for compressability) it just does not make sense to me that higher than recommended octane can do anything.
Old 09-18-2005, 02:11 PM
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Originally Posted by robg' date='Sep 18 2005, 05:25 PM
... it just does not make sense to me that higher than recommended octane can do anything.
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Well, there are experts who work in the industry and believe in it. They also have their reasons to believe in it.

I am NO expert, so it's needless to discuss it.

But since there are two groups of people and both have good valid points... I am using the highest available.


And believe it or not, it feels like it really helps.
Old 09-18-2005, 06:35 PM
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It does... throw in some 100 octane aki and see how that feels.
Attached Thumbnails The octane you put in your E60-img_4968.jpg   The octane you put in your E60-img_4973.jpg   The octane you put in your E60-img_4974.jpg  


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