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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 02-12-2013, 06:28 PM
mikesevel mikesevel is offline
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Gassy question

Owners manual for my '08 328i indicates that 91 octane gas is recommended but the minimum octane for the 328i is 87 and 89 for the 335i. Sooooooooo, wada ya tink about using 89 for my 328i?
Mikey
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  #2  
Old 02-12-2013, 06:56 PM
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tturedraider tturedraider is offline
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  #3  
Old 02-12-2013, 07:04 PM
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boramkiv boramkiv is offline
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Quote:
Originally Posted by mikesevel View Post
Owners manual for my '08 328i indicates that 91 octane gas is recommended but the minimum octane for the 328i is 87 and 89 for the 335i. Sooooooooo, wada ya tink about using 89 for my 328i?
Mikey
Why would you do that if the manual and the inside of your gas lid says minimum octane rating 91? All you have to do is use 91 whenever possible.
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  #4  
Old 02-12-2013, 08:19 PM
BashedBarrique BashedBarrique is offline
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I think my 2006 325i requires 93 octane? Am I remembering correctly? I have only filled it up twice since I have only driven it 550 mile.
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  #5  
Old 02-12-2013, 08:20 PM
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The old old over asked octane question rises again
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  #6  
Old 02-12-2013, 10:59 PM
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tturedraider tturedraider is offline
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Quote:
Originally Posted by BashedBarrique View Post
I think my 2006 325i requires 93 octane? Am I remembering correctly? I have only filled it up twice since I have only driven it 550 mile.
No. 91.
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  #7  
Old 02-12-2013, 11:36 PM
BashedBarrique BashedBarrique is offline
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Originally Posted by tturedraider View Post
No. 91.
Well that's just mid grade around here so not quite as expensive as premium.
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  #8  
Old 02-12-2013, 11:42 PM
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tturedraider tturedraider is offline
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Originally Posted by BashedBarrique View Post
Well that's just mid grade around here so not quite as expensive as premium.
Mid-grade? Really? Carmel, Indiana must be quite a bit different from the rest of the country.
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  #9  
Old 02-13-2013, 07:51 AM
Tom K. Tom K. is offline
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In my area, 89 AKI is generally priced right between 87 and 93, making it a really lousy value. Instead, why not alernate tanks of 87 & 93 (or 91 if that's the highest you can get)?

Incidentally, my 328i runs fine on 87, although I prefer to use 91 or better, depending on price differential.

Tom
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  #10  
Old 02-13-2013, 07:53 AM
Tom K. Tom K. is offline
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Originally Posted by tturedraider View Post
No. 91.
No. 87. The motor is optimised for 91 which is recommended, but BMW states that 87 may be used without damage - only a possible reduction in peak power and fuel economy.

Tom
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  #11  
Old 02-13-2013, 07:59 AM
RBinDC RBinDC is offline
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Quote:
Originally Posted by Tom K. View Post
In my area, 89 AKI is generally priced right between 87 and 93, making it a really lousy value. Instead, why not alernate tanks of 87 & 93 (or 91 if that's the highest you can get)?

Incidentally, my 328i runs fine on 87, although I prefer to use 91 or better, depending on price differential.

Tom
I used to blend 50/50 87 and 93 octane in my Lexus SC 300 to get roughly 90 octane. It generally was significantly cheaper than buying 89 octane, which is usually a bad deal.
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  #12  
Old 02-13-2013, 08:25 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by mikesevel View Post
Owners manual for my '08 328i indicates that 91 octane gas is recommended but the minimum octane for the 328i is 87 and 89 for the 335i. Sooooooooo, wada ya tink about using 89 for my 328i?
Mikey

Gosh-a-mighty, man! Have you done the math? You've little enough power as it is!

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  #13  
Old 02-13-2013, 09:18 AM
drunkryan drunkryan is offline
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Quote:
Originally Posted by mikesevel View Post
Owners manual for my '08 328i indicates that 91 octane gas is recommended but the minimum octane for the 328i is 87 and 89 for the 335i. Sooooooooo, wada ya tink about using 89 for my 328i?
Mikey
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  #14  
Old 02-13-2013, 09:36 AM
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Gosh-a-mighty, man! Have you done the math? You've little enough power as it is!

He probably see only one part of the formula - price. How about distance travel on one tank of gas?

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  #15  
Old 02-13-2013, 09:44 AM
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nathand nathand is offline
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Wow, those gas prices are high. The car is designed to run on non ethanol 91 octane. I figure this 10% ethanol blend is crap enough as it is with out lowering the octane.
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  #16  
Old 02-13-2013, 12:21 PM
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cwinter cwinter is offline
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Quote:
Originally Posted by RBinDC View Post
I used to blend 50/50 87 and 93 octane in my Lexus SC 300 to get roughly 90 octane. It generally was significantly cheaper than buying 89 octane, which is usually a bad deal.
Difference here is about 25 cents. I average 14 gal per fill up. That is a $3.50 savings per tank. I am not saying I like to waste $3.50 but that is a saving of not even one Starbucks coffee per tank.
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  #17  
Old 02-13-2013, 12:26 PM
RBinDC RBinDC is offline
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Originally Posted by cwinter View Post
Difference here is about 25 cents. I average 14 gal per fill up. That is a $3.50 savings per tank. I am not saying I like to waste $3.50 but that is a saving of not even one Starbucks coffee per tank.
Yeah, its small change. My girlfriend always got annoyed and accused me of being cheap.

I would never do that with my 335is. It only gets fed 93 octane Shell V-Power.
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  #18  
Old 02-13-2013, 03:16 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by nathand View Post
Wow, those gas prices are high. The car is designed to run on non ethanol 91 octane. I figure this 10% ethanol blend is crap enough as it is with out lowering the octane.
Ethanol RAISES the octane. Pure ethanol has about a 100 AKI.
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  #19  
Old 02-13-2013, 05:18 PM
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Chop362 Chop362 is offline
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Unless you dig the knocking noise stay away from that low octane garbage...V-Power all the way your auto will thank you.
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Old 02-13-2013, 07:21 PM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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Always 93 octane from Quick Trip, which, by the way, is a top tier fuel distributor, and one of the brands recommended by BMW.

I wonder if my car will like 103 octane avgas... My rental 172 uses it, so my 335 could too, right?. Although at $9/gallon i doubt I'd do it more than once or twice.
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  #21  
Old 02-14-2013, 07:57 AM
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cwinter cwinter is offline
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Quote:
Originally Posted by RBinDC View Post
Yeah, its small change. My girlfriend always got annoyed and accused me of being cheap.

I would never do that with my 335is. It only gets fed 93 octane Shell V-Power.
In the greater scheme of things it really is! You'd be better off just buying a cheaper car in the first place than to save $100 to $300 on gas per year and potentially harm your engine in the long run.
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  #22  
Old 02-14-2013, 08:51 AM
BashedBarrique BashedBarrique is offline
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Modern engines just retard ignition timing if they detect detonation so if you use lower octane fuel you just don't get the performance you would with higher octane fuel. But you wont damage the engine.
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  #23  
Old 02-14-2013, 06:01 PM
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Nordic_Kat Nordic_Kat is offline
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Quote:
Originally Posted by CarlsonTheFlyer View Post
Always 93 octane from Quick Trip, which, by the way, is a top tier fuel distributor, and one of the brands recommended by BMW.

I wonder if my car will like 103 octane avgas... My rental 172 uses it, so my 335 could too, right?. Although at $9/gallon i doubt I'd do it more than once or twice.
I'm sure that as an aviator you are well aware of the consequences of running a car fueled with leaded avgas on public streets. (just don't get caught doing it)
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Old 02-14-2013, 07:46 PM
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Bemo Bemo is offline
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Originally Posted by Chop362 View Post
Unless you dig the knocking noise stay away from that low octane garbage...V-Power all the way your auto will thank you.
"Shell" out the dough and you shall be well rewarded....my 328 purs like a kitten with that stuff....
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Old 02-14-2013, 09:07 PM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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Originally Posted by Nordic_Kat View Post
I'm sure that as an aviator you are well aware of the consequences of running a car fueled with leaded avgas on public streets. (just don't get caught doing it)
I don't know what you are talking about, Kat. I would never do that.
Besides, technically it's low-lead.
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