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5 Series DIY
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  #1  
Old 03-02-2012, 03:18 PM
TMaddale TMaddale is offline
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Location: Virginia
 
Join Date: Feb 2012
Posts: 4
Mein Auto: BMW 5x
Question.

How true it is, the fact that I was told if I dont use 91 or over 91 gasoline I will damage the engine in my bimmer? Someone?

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  #2  
Old 03-03-2012, 08:29 PM
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grizzles grizzles is offline
550 XI M Sport F10
Location: NNJ
 
Join Date: Jul 2010
Posts: 333
Mein Auto: 550 xi Msport
I use 89 and I can't tell the difference
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  #3  
Old 03-04-2012, 08:01 PM
felix.collazo90 felix.collazo90 is offline
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Location: staten island
 
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Mein Auto: 1997 528i
Your manual will tell you the recommended octane

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  #4  
Old 03-07-2012, 07:13 AM
cvslim_e39 cvslim_e39 is offline
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Location: Brockton, Ma.
 
Join Date: Mar 2012
Posts: 12
Mein Auto: 02 530i
My manual says use unleaded. So is regular ok?

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  #5  
Old 03-07-2012, 07:18 AM
felix.collazo90 felix.collazo90 is offline
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Location: staten island
 
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Mein Auto: 1997 528i
First off what is the year make and model of your vehicle? I have a 97 528i my recommended fuel octane is 91 or better so I try and use that

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  #6  
Old 03-07-2012, 07:33 AM
cvslim_e39 cvslim_e39 is offline
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Location: Brockton, Ma.
 
Join Date: Mar 2012
Posts: 12
Mein Auto: 02 530i
I have an 02 530i 5 speed

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  #7  
Old 03-07-2012, 07:52 AM
felix.collazo90 felix.collazo90 is offline
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Location: staten island
 
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Mein Auto: 1997 528i
I have found this forum post in regards to all bmw's and how they are tested

Thomas Plucinsky, BMW Product and Technology Communications Manager told us all BMW engines are designed to run on 91 octane. All performance testing, including EPA emissions and fuel mileage, is done with 91 octane. However, though BMW is all about performance, their motors will run on 89 or 87 octane without damage. The knock sensors pull the ignition timing back and eliminate detonation. There will be a loss of power and a decrease in fuel mileage, but the size of the horsepower loss and the increase in fuel consumption depends upon many factors, such as ambient temperature, exact formulation of the fuel and driving technique, so BMW does not offer any estimates for operation on lower grade fuels. One not so obvious concern, Mr. Plucinsky noted, is the type and quality of additives the gasoline companies include in the fuel. Premium gasolines may have better additive packages which are more effective keeping fuel systems (particularly injectors) clean and working efficiently, than those in regular grade fuels or off-brand products. Using lower octane or off-brand fuel could be degrading the fuel system over time, setting you up for a repair bill down the line.

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  #8  
Old 03-28-2012, 06:24 PM
Jahstone Jahstone is offline
5.25iStone
Location: Atlanta
 
Join Date: Mar 2012
Posts: 9
Mein Auto: 5.25I
Fellas, on the real....i just got my '92 5.25i, and I ignorantly used regular gas for bout a week...bad move! My idle started making the car rock!!! Never again! Premium Only!!!!

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