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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 05-08-2013, 07:52 AM
DBeavs DBeavs is offline
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Oops...Used 87 octane instead of 91 octane

Hi all,
I accidently (on the phone in process) used the 87 octane gas this morning when filling the wife's car instead of the normal 91 octane. I didnt even realize it until now. The car isnt being driven, its at home, I was just doing what I thought was a favor..(we shall see).

At any rate, the question is obvious, will this full tank of gas hurt the car if its 87 octane? I have no problem fixing the situation if need be, because my wife is going to be equally menacing as any solution to fix, assuming she finds out its harmful. So I want to be sure. To my knowledge the car has always used 91 octane, I just wasnt paying attention this morning.

The car is a 2009 335i Hardtop Convertible, 24K miles.

Thoughts or advice?
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  #2  
Old 05-08-2013, 07:57 AM
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lqaddict lqaddict is online now
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Quote:
Originally Posted by DBeavs View Post
Hi all,
I accidently (on the phone in process) used the 87 octane gas this morning when filling the wife's car instead of the normal 91 octane. I didnt even realize it until now. The car isnt being driven, its at home, I was just doing what I thought was a favor..(we shall see).

At any rate, the question is obvious, will this full tank of gas hurt the car if its 87 octane? I have no problem fixing the situation if need be, because my wife is going to be equally menacing as any solution to fix, assuming she finds out its harmful. So I want to be sure. To my knowledge the car has always used 91 octane, I just wasnt paying attention this morning.

The car is a 2009 335i Hardtop Convertible, 24K miles.

Thoughts or advice?
Thoughts or advice? Just drive the car it's not like it's going to disintegrate if you feed it some regular gas.
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  #3  
Old 05-08-2013, 08:04 AM
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Saintor Saintor is offline
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Technically this is a direct injection engine with near zero risk of detonation. Just use it (and never tell your dealer - some just freak for nothing).
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  #4  
Old 05-08-2013, 08:05 AM
git_yo_own git_yo_own is offline
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87 will not hurt your car. I'm not sure if you tried doing a search, but you'll find this was discussed in detail a few times in the forum.
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  #5  
Old 05-08-2013, 08:07 AM
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///M-ratedE90 ///M-ratedE90 is offline
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The engine is tuned to take 87. You are okay. Even M3's are tuned to run on 87 so f**kwits can drive the car without it coughing.
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  #6  
Old 05-08-2013, 08:12 AM
jburke4689 jburke4689 is offline
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You will have a slight reduction of top end. With normal driving you won't even notice it.
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  #7  
Old 05-08-2013, 08:13 AM
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Quote:
Originally Posted by DBeavs View Post
Hi all,
I accidently (on the phone in process) used the 87 octane gas this morning when filling the wife's car instead of the normal 91 octane. I didnt even realize it until now. The car isnt being driven, its at home, I was just doing what I thought was a favor..(we shall see).

At any rate, the question is obvious, will this full tank of gas hurt the car if its 87 octane? I have no problem fixing the situation if need be, because my wife is going to be equally menacing as any solution to fix, assuming she finds out its harmful. So I want to be sure. To my knowledge the car has always used 91 octane, I just wasnt paying attention this morning.

The car is a 2009 335i Hardtop Convertible, 24K miles.

Thoughts or advice?
One tank of 87 won't destroy your car, they're technically alright to run on 87.
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  #8  
Old 05-08-2013, 08:25 AM
irianjim irianjim is offline
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I wouldn't worry about it, but if I were to have done this, I would burn a quarter of a tank, fill it with the 91 octane and then do that again for awhile until I had at least gone through a tank or two. You will average up pretty quickly if you are really concerned.

Now if you would have put diesel in it - that would have really been a disaster. So count your blessings!

Good Luck!
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  #9  
Old 05-08-2013, 08:36 AM
1zamboni 1zamboni is offline
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One tank would not hurt the car.
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  #10  
Old 05-08-2013, 09:11 AM
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Oops...Used 87 octane instead of 91 octane

Is this deja vu all over again?


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  #11  
Old 05-08-2013, 09:22 AM
DBeavs DBeavs is offline
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Thanks all...I assumed it was no issue, but yes..I have "experts" all around saying various things, while I assumed I'd be fine, I just wanted to go to the source. I do apologize for not researching the forum, I just asked to get some feedback. I do appreciate it. Thanks and take care to all!
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  #12  
Old 05-08-2013, 09:34 AM
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furby076 furby076 is offline
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Quote:
Originally Posted by DBeavs View Post
Hi all,
I accidently (on the phone in process) used the 87 octane gas this morning when filling the wife's car instead of the normal 91 octane. I didnt even realize it until now. The car isnt being driven, its at home, I was just doing what I thought was a favor..(we shall see).

At any rate, the question is obvious, will this full tank of gas hurt the car if its 87 octane? I have no problem fixing the situation if need be, because my wife is going to be equally menacing as any solution to fix, assuming she finds out its harmful. So I want to be sure. To my knowledge the car has always used 91 octane, I just wasnt paying attention this morning.

The car is a 2009 335i Hardtop Convertible, 24K miles.

Thoughts or advice?
Get a tube and immediately siphon the gas out of the tank. Make sure to get every last drop. It, even sitting in your car, will damage your fuel tank. When you run the car the greater impurities will damage the injectors as well as the knock sensor. You are looking at thousands of dollars (potentially) in repairs.

Quote:
Originally Posted by ///M-ratedE90 View Post
The engine is tuned to take 87. You are okay. Even M3's are tuned to run on 87 so f**kwits can drive the car without it coughing.
Blasphemy! 91 for 325 to 335 and 105 for M3. Turn in your goat!
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I agree with furby
Quote:
Originally Posted by guerilla twang View Post
Hahahaha, I like you furb, you like to live dangerously.
Quote:
Originally Posted by ProfessorCook View Post
I started to google to find a picture to match furby's suggestion to Gia, but it quickly became clear it was an inappropriate search to conduct at work.
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  #13  
Old 05-08-2013, 09:37 AM
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furby076 furby076 is offline
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Quote:
Originally Posted by irianjim View Post
I wouldn't worry about it, but if I were to have done this, I would burn a quarter of a tank, fill it with the 91 octane and then do that again for awhile until I had at least gone through a tank or two. You will average up pretty quickly if you are really concerned.

Now if you would have put diesel in it - that would have really been a disaster. So count your blessings!

Good Luck!
Aren't the diesel nossels sized larger to prevent people from sticking it in their non-diesel tank?

Quote:
Originally Posted by DBeavs View Post
Thanks all...I assumed it was no issue, but yes..I have "experts" all around saying various things, while I assumed I'd be fine, I just wanted to go to the source. I do apologize for not researching the forum, I just asked to get some feedback. I do appreciate it. Thanks and take care to all!
We aren't the source, that would be BMW. We are however something entirely else
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Quote:
Originally Posted by cwinter View Post
I agree with furby
Quote:
Originally Posted by guerilla twang View Post
Hahahaha, I like you furb, you like to live dangerously.
Quote:
Originally Posted by ProfessorCook View Post
I started to google to find a picture to match furby's suggestion to Gia, but it quickly became clear it was an inappropriate search to conduct at work.
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  #14  
Old 05-08-2013, 09:57 AM
irianjim irianjim is offline
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Originally Posted by furby076 View Post
Aren't the diesel nossels sized larger to prevent people from sticking it in their non-diesel tank?
Apparently not always. My brother-in-law managed to fill up his Buick with diesel last year. It didn't end well.....
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  #15  
Old 05-08-2013, 10:09 AM
hondo402000 hondo402000 is offline
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or if you are worried put a can of octane boot in it.
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  #16  
Old 05-08-2013, 10:13 AM
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E92-Lighting E92-Lighting is offline
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its not that big of a deal
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  #17  
Old 05-08-2013, 10:32 AM
TaylorC TaylorC is offline
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When I bought my car it had 87 in it. I got it from a BMW dealership as well.
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  #18  
Old 05-08-2013, 12:20 PM
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ECSTuning ECSTuning is offline
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Diesel would have created issues. But with 87 octane fuel the computer will note the lower octane level, play with the timing and everything will be OK. Just avoid the track until your able to fill up with proper fuel.
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  #19  
Old 05-08-2013, 12:47 PM
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3two8iguy 3two8iguy is offline
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Why tell the wife anything,tell her you filled it up with the best stuff on the planet and let her wine and dine you for being a great husband
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  #20  
Old 05-08-2013, 04:35 PM
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Last Sight Last Sight is offline
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Quote:
Originally Posted by bocabimmer View Post
Is this deja vu all over again?


Sent from BimmerApp mobile app
Please see the below quote, from yours truly, regarding this issue:


Quote:
Originally Posted by Last Sight View Post
...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."

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  #21  
Old 05-08-2013, 11:19 PM
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If I had a dollar for every 91-octane vs. 87-octane thread that appeared on Bimmerfest, I'd be a very rich woman.

No offense to the OP, of course... I'm just sayin'.
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  #22  
Old 05-08-2013, 11:26 PM
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Kilgore Trout Kilgore Trout is offline
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Originally Posted by Last Sight View Post
Please see the below quote, from yours truly, regarding this issue:
At least it will give the forum bounce and shine.
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  #23  
Old 05-09-2013, 08:11 AM
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Chop362 Chop362 is offline
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Shouldn't be on the phone when pumping gas unless begging for an explosion...Saw this on 60 minutes and as rare as it could be i wouldn't.
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  #24  
Old 05-09-2013, 10:04 AM
Nickh Nickh is offline
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Originally Posted by cruisingbimmer View Post
If I had a dollar for every 91-octane vs. 87-octane thread that appeared on Bimmerfest, I'd be a very rich woman.

No offense to the OP, of course... I'm just sayin'.
You're too rich to be reading these octane threads.
You should be reading the WSJ on how much more to load up on BP & Exxon stock...
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  #25  
Old 05-10-2013, 06:50 AM
335i Driver 335i Driver is offline
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Your car is ruined, absolutely ruined I say. The only logical thing you can do now is trash it. Fortunately, I have a car pick-up serivice and I have the courtesy to take it of your hands for free. I won't even charge you a pcik-up fee. Just give me your address and I'll come pcik it up.
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