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  #41  
Old 04-15-2006, 06:39 PM
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The octane rating is simply the resistance to detonation, think of a diesel engine. You will not see an increase in performance going to a higher octane fuel and may actually see a decrease because of the slower flame propagation due to the higher octane rating causing a slower burn.

The best fuel to use is the lowest octane rating that does not detonate. Just because 87 does not detonate in winter does not mean it won't in the middle of summer when temperatures rise. Of course there are safety margins in BMW's recommendation of 91 under most normal operating conditions but why chance it for a few dollars a tank. I have destroyed several race motors due to detonation and it is not cheap!
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  #42  
Old 04-15-2006, 07:19 PM
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i just wounder, is it ok that i put shell v-pover (100 pctane) on my 4.8 since i bought it? i think its ok, because i asked in bmw service here in Geneva, they told that is allright. Also he told me that its not good to go down with gasolin which has lower octane.
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  #43  
Old 04-15-2006, 08:15 PM
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Ive 100 octane in my M5 and M3 and it ran great. i was gonna put some in my X5 just for the hell of it this summer
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  #44  
Old 04-16-2006, 12:04 AM
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Engine damge vs a paltry savings aside, isn't it a zero sum argument anyway? Before the X5, the Volvo R would run fine on 87 but a tank of 91 or 93 yielded more miles, so I've only run the 91 or 93 in the X. I only fill up about every 10 days, so if burning premo is an issue, I need to be looking at a bus pass.
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  #45  
Old 04-16-2006, 01:32 AM
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Quote:
Originally Posted by Jiga jace1
I Use 93... Is That A Good Thing Or Should I Be Getting 91?
It is a waste of money over purchasing 91, but it won't generally hurt the engine. If you have a misfire in cold weather, stop using higher octane fuel, as it can cause the misfire.

The biggest mistake made is that people assume that a higher AKI is somehow better. If you have a sufficient AKI to resist predetonation, anything else is lost. Your engine can't tell the difference.
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  #46  
Old 04-16-2006, 01:37 AM
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I just wonder, is it ok that I put Shell V-power (100 octane) in my 4.8 since I bought it? I think it's ok, because I asked in BMW service here in Geneva, they told that it is all right. Also he told me that its not good to go down with gasoline which has lower octane.
Quote:
Originally Posted by DINANM3
Ive 100 octane in my M5 and M3 and it ran great. I was gonna put some in my X5 just for the hell of it this summer
DinanM3, you seem to be confusing RON with pump octane. The poster who asked the question is in Geneva. 100 RON in Geneva is very close in anti-knock properties to 93 pump octane in North America. Your 100 octane fuel in a road vehicle doesn't make a lot of sense, as the engine was not designed for it.
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  #47  
Old 04-16-2006, 01:42 AM
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Quote:
Originally Posted by accella4.4
Engine damge vs a paltry savings aside, isn't it a zero sum argument anyway? Before the X5, the Volvo R would run fine on 87 but a tank of 91 or 93 yielded more miles, so I've only run the 91 or 93 in the X. I only fill up about every 10 days, so if burning premo is an issue, I need to be looking at a bus pass.
It is not a zero sum argument, and in my case, I don't think it is a cost issue at all. Measuring from fill to fill, over several tanks, my best mileage has always been on 89. YMMV, it depends completely on the quality of fuel you have access to. I use 91 when I travel, but at home, all my vehicles get 89. I do notice a decrease in performance with 87, and so I don't use regular, since it is obvious that the ECU is retarding the timing. That is not true with 89 pump octane, in my case. Again, YMMV.
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  #48  
Old 04-16-2006, 05:57 AM
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Quote:
Originally Posted by JCL
DinanM3, you seem to be confusing RON with pump octane. The poster who asked the question is in Geneva. 100 RON in Geneva is very close in anti-knock properties to 93 pump octane in North America. Your 100 octane fuel in a road vehicle doesn't make a lot of sense, as the engine was not designed for it.
But i think in Geneva, V-power from shell is an 100 octane, and nothing else, because if v-power is equal to 93, (as i understood) then what is "Sans plomb 93" also which is offered in Shell gas stations?
Because if this is something that is even lower... A friend of mine has Mazda rx-8 and he puts Sans plomb 93 into his tank, and i think it wouldn't run on that if it would be something les than 93.
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  #49  
Old 04-16-2006, 10:03 AM
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Quote:
Originally Posted by JCL
It is not a zero sum argument, and in my case, I don't think it is a cost issue at all. Measuring from fill to fill, over several tanks, my best mileage has always been on 89. YMMV, it depends completely on the quality of fuel you have access to. I use 91 when I travel, but at home, all my vehicles get 89. I do notice a decrease in performance with 87, and so I don't use regular, since it is obvious that the ECU is retarding the timing. That is not true with 89 pump octane, in my case. Again, YMMV.
So there is chemically almost no difference between 89 and 91? I'm askin' not debatin'...and maybe I missed this, but the reason for 91 on the long runs is why? Fuel quality control or slightly more efficiency from a tank? I would ask, why not give a car the better stuff when it is working harder in stop & go city driving, no? Or, is 89 all the car requires? And what about sea-level driving vs higher altitude?
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  #50  
Old 04-16-2006, 11:54 AM
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Quote:
Originally Posted by Riyad Aliyev
But i think in Geneva, V-power from shell is an 100 octane, and nothing else, because if v-power is equal to 93, (as i understood) then what is "Sans plomb 93" also which is offered in Shell gas stations?
Because if this is something that is even lower... A friend of mine has Mazda rx-8 and he puts Sans plomb 93 into his tank, and i think it wouldn't run on that if it would be something les than 93.
You need to determine what the 100 V Power, and 93 sans plomb (unleaded) are in terms of RON. RON is the usual measurement in Europe. There is a 6-7 point spread between RON and pump octane, which is (R+M)/2, where R equals RON and M equals motor octane method. Again, it is not a precise conversion because it depends on the specific fuel.

I would guess that the 93 unleaded your friend uses is very close to 87 pump octane in North America. Just as with the BMW engine, a Mazda will run fine on 87 pump octane, it just may not develop all of the power it is capable of.
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