Fuel question

heart_doctor · 03-07-2015, 05:08 PM

I have a 2011 e92 m3. I have noticed that there have been gas stations in my area that have started to offer ethanol free 91 octane gas. I've currently been using 93 octane 10% ethanol. Which would be better for my car?

Helmsman · 03-08-2015, 07:31 AM

The higher octane the better bro. No reason to force knock if possible to avoid.

Cheers

///Mvy · 03-08-2015, 10:32 AM

Quote:

Originally Posted by Helmsman

The higher octane the better bro. No reason to force knock if possible to avoid.

Cheers

+1

OneSickM · 03-08-2015, 11:43 AM

What is the problem of having 10% ethanol anyways?

heart_doctor · 03-08-2015, 11:46 AM

That's my question. From what I understand ethanol reduces gas mileage, destroys rubber components of your engine and causes water to accumulate in gas tank. I use 93 octane 10% ethanol fuel now but more and more gas stations are offering "pure gas" but it's octane rating is only 91. I know some parts of California only offer 91 octane and people with m's use it all the time. Was just wondering what is the best long term option for an e92 m3.

Amirsm3 · 03-08-2015, 12:17 PM

Most modern cars can accommodate up to 10% ethanol. We're talking software and the components that the ethanol comes in contact with.

Bagelfast · 03-08-2015, 01:37 PM

93 octane with 10% eth /thread

BzsBimmer · 03-08-2015, 03:43 PM

I'll play. 91 octane without ethanol

///M Power-Belgium · 03-08-2015, 04:12 PM

Quote:

Originally Posted by BzsBimmer

I'll play. 91 octane without ethanol

Detonation and knock is the big problem , please read # 2334 on this page => http://www.m3post.com/forums/showthr...92838&page=107

BzsBimmer · 03-08-2015, 05:19 PM

Ethenol is crap additive. Ill take pure gas any day of the week.
Someone show me that you get knock with 91 when BMW designs with 91 min. Sure it'll run slightly better with higher octane but theres a slight tradeoff with running corny

03-07-2015, 05:08 PM	#1
heart_doctor Lieutenant 320 Rep 581 Posts Drives: 2017 M2 Join Date: May 2011 Location: USA iTrader: (0)	Fuel question I have a 2011 e92 m3. I have noticed that there have been gas stations in my area that have started to offer ethanol free 91 octane gas. I've currently been using 93 octane 10% ethanol. Which would be better for my car? __________________
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03-08-2015, 07:31 AM	#2
Helmsman Major General 4482 Rep 7,122 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	The higher octane the better bro. No reason to force knock if possible to avoid. Cheers
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03-08-2015, 11:43 AM	#4
OneSickM Captain 122 Rep 750 Posts Drives: M3 Join Date: Jul 2014 Location: --- iTrader: (2)	What is the problem of having 10% ethanol anyways?
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03-08-2015, 11:46 AM	#5
heart_doctor Lieutenant 320 Rep 581 Posts Drives: 2017 M2 Join Date: May 2011 Location: USA iTrader: (0)	That's my question. From what I understand ethanol reduces gas mileage, destroys rubber components of your engine and causes water to accumulate in gas tank. I use 93 octane 10% ethanol fuel now but more and more gas stations are offering "pure gas" but it's octane rating is only 91. I know some parts of California only offer 91 octane and people with m's use it all the time. Was just wondering what is the best long term option for an e92 m3. __________________
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03-08-2015, 12:17 PM	#6
Amirsm3 Brigadier General 514 Rep 3,482 Posts Drives: 2011 Space Grey e90 M3 Join Date: Feb 2014 Location: Williams/Flagstaff, AZ iTrader: (3)	Most modern cars can accommodate up to 10% ethanol. We're talking software and the components that the ethanol comes in contact with. __________________ 2011 e90 M3 Space Grey DCT ZCP- eAs, BMW Performance, Agency Power, Macht Schnell, iND, Milltek, Volk, Challenge, Stoptech, Ohlins BMWCCA:518970
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03-08-2015, 01:37 PM	#7
Bagelfast Lieutenant Colonel 125 Rep 1,546 Posts Drives: BMW Join Date: Sep 2008 Location: USA iTrader: (0)	93 octane with 10% eth /thread
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03-08-2015, 03:43 PM	#8
BzsBimmer Major General 3287 Rep 6,729 Posts Drives: '23 G80 FO M3, M3 & MY Tezzy's Join Date: Mar 2006 Location: Nor. Cal iTrader: (32)	I'll play. 91 octane without ethanol Last edited by BzsBimmer; 03-08-2015 at 03:58 PM..
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03-08-2015, 05:19 PM	#10
BzsBimmer Major General 3287 Rep 6,729 Posts Drives: '23 G80 FO M3, M3 & MY Tezzy's Join Date: Mar 2006 Location: Nor. Cal iTrader: (32)	Ethenol is crap additive. Ill take pure gas any day of the week. Someone show me that you get knock with 91 when BMW designs with 91 min. Sure it'll run slightly better with higher octane but theres a slight tradeoff with running corny
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