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X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #26  
Old 06-26-2013, 09:50 AM
DslDwg DslDwg is offline
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Basically it's the way the Octane number is presented. US and Canada and a couple other countries do it one way while Europe and other parts or the world do it another.

The octane ratings low to high are typically equivalent.
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  #27  
Old 06-30-2013, 03:29 PM
RhoXS RhoXS is offline
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Quote:
Originally Posted by DslDwg View Post
... do yourself a favor and use the highest octane fuel available in your new BMW.
Why?

What advantage is there spending more for an octane rating greater than that recommended by the manufacturer?

Octane is not a measure of the gasoline's energy content. It is only a measure that allows a higher compression engine without harmful detonation. Higher compression means a more efficient engine and therefore more energy output per unit of gasoline as long as the computer does not have to retard the spark to prevent detonation. So, if the minimum recommended octane will not result in a retarded spark under worst case conditions, why spend more money on an octane rating greater than that recommended by the manufacturer?

Last edited by RhoXS; 06-30-2013 at 03:32 PM.
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  #28  
Old 06-30-2013, 03:55 PM
DslDwg DslDwg is offline
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Read my original post I understand the purpose of the octane rating. At the end of the day I don't care what people run in their cars. Are you 100% sure that when you use 89 octane in your car that you aren't detonating? I' m not sure and I'm not willing to take a chance. Your car your choice certainly.
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  #29  
Old 06-30-2013, 05:10 PM
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WHITEX WHITEX is offline
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Quote:
Originally Posted by DslDwg View Post
Read my original post I understand the purpose of the octane rating. At the end of the day I don't care what people run in their cars. Are you 100% sure that when you use 89 octane in your car that you aren't detonating? I' m not sure and I'm not willing to take a chance. Your car your choice certainly.
I did fill (about 5gallons) with 89. If the motor calls for it it's designed to use it. Using a higher octane does nothing. However I will use 91 from now on. My 4 cyc MiniS uses 91.
Detonation is a bad thing. Engine ping is damaging.
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  #30  
Old 07-01-2013, 12:42 AM
RhoXS RhoXS is offline
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I am reasonably sure the recommended rating assures maximum rated engine output under most conditions. Similarly, the minimum rating is the lowest octane the computer & engine can handle and still prevent engine damage from detonation, albeit with a loss of output.

91 is the minimum recommended octane for my Z3, X3, and Lexus RX350. I do not use anything less than 91 but more often than not pump 93 octane simply because 91 is not available. I have followed this practice since I bought a 1988 E30 M3 new. It was the first car I owned requiring the use of "premium" gasoline. Interestingly, my wife inadvertently filled the tank with 89 octane one day. I discovered this almost immediately. I called BMW NA and asked if they thought there would be any harm using the 89 octane gas for a single tank assuming no hard acceleration etc. They were adamant about having the car towed to a dealer to have the tank drained and clearly stated I risked damaging the engine using 89 octane, no matter how few miles or gently it was driven. I actually did drive about 30 miles to a shop and had them drain the tank, with no obvious ill effect for the next 100,000 miles.

I did have a 1985 Nissan 300ZX Turbo. Originally it only required "regular" but after installing an intercooler and increasing the boost from 6 psi to 10-12 psi I used the highest octane I could find. Even then I worried about detonation but never had a noticeable problem.
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  #31  
Old 07-01-2013, 04:51 AM
dudley07726 dudley07726 is offline
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I always use 93 Octane for my 2012 X3 2.8. The only time (twice) I had to fill it with Regular 87 Octane was during Hurricane Sandy. When I could get gas, it was only regular that they were selling. I had no choice. I did not notice any ill effects.
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  #32  
Old 07-10-2013, 12:28 AM
ealeisa ealeisa is offline
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Since 91 Octane is acceptable, you can derive 91 from 93 and 89 (premium and plus)
Put half the tank 93 and the other half 89 and the average will be 93+89/2= 91...
Saves you money
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  #33  
Old 07-10-2013, 04:19 AM
e1322739 e1322739 is offline
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93 unleaded all the time ?

I worked at a refinery years ago. They always put their best quality, cleanest burning components into their highest octane premium fuel. Octane boost is not the only benefit of using premium fuel.

Refiners also put their best fuel additive packages in premium fuels. My SA told me he has seen many cars with issues using poor quality gas. He suggested I stick with top tier fuels. (http://www.toptiergas.com/)


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  #34  
Old 07-10-2013, 05:31 AM
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WHITEX WHITEX is offline
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The fuel door reads Use Premium fuel..."89 Minimum Octane". I'm sticking with 91/92.
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GONE>>>Sold. One of the best rides I ever owned. My 1st BMW-2006 X3 3.0 White w/blk. Prem/Nav/Sirius/Servo/Heated seats,steering/Park Dist./Xenon/Privacy.I got the auto. trans. so my wife can drive it.
Our 2nd Bimmer2014 X3 i35 Alpine/Chestnut. Nav,Prem,Tech,Cold Weather, Shades. Got the Automatic cause we had no choice
My 1st Mini-2010 PW, I got the 6 speed so my wife can't drive it. Laurel Edition Convert
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  #35  
Old 07-10-2013, 08:29 PM
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Quote:
Originally Posted by e1322739 View Post
I worked at a refinery years ago. They always put their best quality, cleanest burning components into their highest octane premium fuel. Octane boost is not the only benefit of using premium fuel.

Refiners also put their best fuel additive packages in premium fuels. My SA told me he has seen many cars with issues using poor quality gas. He suggested I stick with top tier fuels. (http://www.toptiergas.com/)


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TopTierGas been using for the past 3yrs never had an issue with engine
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  #36  
Old 07-16-2013, 06:37 AM
Ml3456 Ml3456 is offline
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Worked in refining and fuels technology also. I agree completely. We did a test of fuels years ago. #1with additives was She'll. #2 by only 1% is BP, Then Exxon and Mobil. BP additive was the best cleaner though. The additives (or lack of) in warehouse gas was wakeful and not much of it. Minimum to meet regs.
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  #37  
Old 07-16-2013, 07:12 AM
RhoXS RhoXS is offline
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Quote:
Originally Posted by Ml3456 View Post
The additives (or lack of) in warehouse gas was wakeful and not much of it.
Please tell me what you mean by "warehouse gas".

I am a big believer in the long term importance of additives. I also buy a lot of gas at a chain of very large discount gas stations in the southeast (RaceTrac). Although this chain sells a lot of gas, the source is certainly not obvious. Never really thought this would be a problem as I assume it has to be one of the major refiners but you comment got me thinking.
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  #38  
Old 07-17-2013, 03:18 AM
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Teemo Panda Teemo Panda is offline
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93 unleaded all the time ?

Quote:
Originally Posted by edbiology View Post
Am I the only one who put 87 in the loaner car?
Lol, who cares, it's not your car anyways :lol:


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  #39  
Old 07-17-2013, 06:55 AM
bimmermann882 bimmermann882 is offline
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There is a gas station with no ethanol and its 91 I think Is that fine.... I had a X5M at one time....
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  #40  
Old 07-17-2013, 06:58 AM
bimmermann882 bimmermann882 is offline
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What about no ethanol 91 that I use that is near my house to fill up my old X5M
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  #41  
Old 07-18-2013, 06:29 AM
Ml3456 Ml3456 is offline
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A lot of the Costco, Sam's etc use cheaper additives and octane boosters sometimes. Don't know about your local chain, but national the majors continue to have the best quality. Lexus and Costco had a settlement due to the amount of fuel injectors Lexus replaced under warranty due to poor Costco fuel. Not worth a buck or two in savings when I bought a performance car.
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