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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 04-19-2013, 01:55 AM
bmw777 bmw777 is offline
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Exclamation 89 octane gasoline

is it good using 89 octane gas yes or no?
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  #2  
Old 04-19-2013, 02:23 AM
Klamalama Klamalama is offline
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89 octane gasoline

In my experience, it's ok if you blend it (1:1) with 93 octane. I notice a slight loss in mileage and performance with less than 91. Anyway, you did by a BMW. By the way, some Sunoco stations have the 91, besides 89 & 93, and priced in between.


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Old 04-19-2013, 02:50 AM
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Well, if you are actually in L.A. and 93 isn't available then you have a limited choice. 91 is there.
I know in Flagstaff Arizona area the highest available is 89, at least when I was there 2 years ago. The cars knock sensors take care of business to run correctly. Performance will not be as advertised, but 91 should be used whenever possible.
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Old 04-19-2013, 03:14 AM
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is it good using 89 octane gas yes or no?
What do you mean by 'good'?
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Old 04-19-2013, 04:35 AM
gpburdell gpburdell is offline
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Originally Posted by bmw777 View Post
is it good using 89 octane gas yes or no?
What are you going to use it in, and what's the minimum and recommended octane ratings for what you're using it in?

IMHO if you value what you're putting the gasoline into, use what's recommended. If you're in a pinch, then use a lower octane but dont go below the minimum listed by the manufacturer.

You might wish to try a search. "What octane to use" is a very common question and there are MANY threads on the topic. There's even one discussion going on right now: http://www.bimmerfest.com/forums/sho...d.php?t=690119

Last edited by gpburdell; 04-19-2013 at 04:37 AM.
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  #6  
Old 04-19-2013, 06:01 AM
Ml3456 Ml3456 is offline
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You should have bought a Camry if the $2-3 fill up difference is such a big deal after buying a high performance car!
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  #7  
Old 04-19-2013, 08:47 AM
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is it good using 89 octane gas yes or no?
For what car?
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Old 04-19-2013, 08:49 AM
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Old 04-19-2013, 04:35 PM
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Old 04-19-2013, 05:12 PM
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is it good using 89 octane gas yes or no?

Lending perspective: Compared to what?

Somewhere deep in memory is another post, maybe more, posing just this question. Perhaps I will SEARCH for it.....I'm noticing now that very word next to a small downward pointing triangle....I wonder what that means?

Yes. SEARCH. I'll try that soon.
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Old 04-19-2013, 05:19 PM
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You should have bought a Camry if the $2-3 fill up difference is such a big deal after buying a high performance car!
Is all we need in this thread is "Lexus is just a rebadged Toyota"' and we'll have a complete collection of cliches.
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Old 04-19-2013, 05:30 PM
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is it good using 89 octane gas yes or no?
For a 325 It might be the recommended fuel what's the tank placard say?
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Old 04-19-2013, 07:57 PM
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Is all we need in this thread is "Lexus is just a rebadged Toyota"' and we'll have a complete collection of cliches.
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Old 04-25-2013, 07:44 PM
dexterp652 dexterp652 is offline
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Originally Posted by bear-avhistory View Post
For a 325 It might be the recommended fuel what's the tank placard say?
Both my 2011 e90 and 2009 e92 328s recommend 91. My 97 e36 on the other hand recommends 89 as well as the F30 loaners I had.
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Old 04-25-2013, 08:05 PM
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I have two 89's & two 91's
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Old 04-25-2013, 09:40 PM
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NOT AGAIN
It never ends.
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Old 04-26-2013, 07:06 AM
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NOT AGAIN
Quote:
Originally Posted by cruisingbimmer View Post
It never ends.
Again, please reference my "Pantene Theory of Forum Topics"

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...This conversation will go on, either in this thread or another new one in the future, as long as BMW puts 91 in their owner's manuals as it has. I have developed, and am currently looking for my PhD, on the "Pantene Theory of Forum Topics" (that's right folks, you heard it here first!). The theory states, "Much like on a bottle of Pantene Shampoo: Wash, Rinse, Repeat is the process of re-hashing a dead topic to gain zero additional insight into an issue and repeating ad infinitum. This endless loop process is often found on forums and shampoo bottles."

While Bear-avhistory might be banging his head, I am gaining crucial data to support my theorem.
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Old 04-26-2013, 08:11 AM
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is it good using 89 octane gas yes or no?
There is a wonderful resource inside your car which should answer most of your questions and is a good idea to read through:

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Old 04-26-2013, 09:13 AM
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NOT AGAIN
I agree. Let's just strike
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Old 04-26-2013, 09:20 AM
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Old 04-26-2013, 11:41 AM
jburke4689 jburke4689 is offline
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Originally Posted by boramkiv View Post
Well, if you are actually in L.A. and 93 isn't available then you have a limited choice. 91 is there.
I know in Flagstaff Arizona area the highest available is 89, at least when I was there 2 years ago. The cars knock sensors take care of business to run correctly. Performance will not be as advertised, but 91 should be used whenever possible.
Flagstaff is at 6,900 ft of elevation. The higher the altitude, the lower the octane requirement. That applies to any car.
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Old 04-26-2013, 12:32 PM
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Flagstaff is at 6,900 ft of elevation. The higher the altitude, the lower the octane requirement. That applies to any car.
Why would this be the case? Is it harder to burn gas (and hence greater compression possible) at higher altitudes?
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Old 04-26-2013, 12:49 PM
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The natural PSI at high altitude is lower so its lowering your effective compression ratio in the engine. The lower the CR the lower the octane requirement. Super/turbo chargers can screw this up but they still provide less boost at altitude. So generally speaking in a pure stock environment you might be able to drop the gas octane number in a boosted car.

I know some high altitude states sell 85 as regular, but don't fill up then go down the mountain.
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Last edited by bear-avhistory; 04-26-2013 at 12:51 PM.
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Old 04-26-2013, 12:52 PM
jwaggz82 jwaggz82 is offline
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If you are running a stock tune, filling up with premium and then filling up again at half tank with mid grade is 100% going to not cause any issues (the octane is still going to be plenty high enough). I am not going to flame the thread and am giving you an honest answer. Pretty much once you start filling up with premium you don't even think about the extra few dollars its costing. If your tuned, I wouldn't mess with putting anything less then premium.
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Old 04-26-2013, 02:53 PM
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Originally Posted by bear-avhistory View Post
The natural PSI at high altitude is lower so its lowering your effective compression ratio in the engine. The lower the CR the lower the octane requirement. Super/turbo chargers can screw this up but they still provide less boost at altitude. So generally speaking in a pure stock environment you might be able to drop the gas octane number in a boosted car.

I know some high altitude states sell 85 as regular, but don't fill up then go down the mountain.
Very interesting.
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