Are octane ratings the same everywhere? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-03-2004, 07:08 PM
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I'm just curious about octane ratings...

On the manual it says Recommended octane rating : 91 AKI
BMW engines have knock sensors and will adapt automatically to diffetent octane ratings provided that the minium octane requirement (87 AKI) is met.

I have a bmw sticker on the filler cap it says

Unleaded premium grade petrol only : minium 95 octane

I've read various posts in this and other forums with people saying they are using premium grade petrol with a 93 octane for their bmws.

I'm living in New Zealand and we have 3 types of petrols you can get, regular 91 octane, premium 96 octane and premium ultra 98 octane.

I'm using premium 96 at the moment

Just wondering why the manual says between 87 ~ 91, while various ppl says they use premium 93 and my filler caps says no less than 95 used

I've no problems using premium 96 as it's only a few dollars more anyway but wanna know why the octane ratings varies so much .
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#2 (permalink) Old 09-03-2004, 07:12 PM
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ya ur not from the US. because we only have 89. 91 and 93 octane fuel thats probably why (im guessing) the manuel says that, and euro engines require higher octane fuel

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#3 (permalink) Old 09-03-2004, 10:34 PM
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Quote:
Originally posted by e36_m3_Turbo@Sep 3 2004, 08:52 PM
ya ur not from the US. because we only have 89. 91 and 93 octane fuel thats probably why (im guessing) the manuel says that, and euro engines require higher octane fuel
Haha, i can get 94 premium.

and 106 race gas. 2.019 a gallon.

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#4 (permalink) Old 09-04-2004, 12:00 PM
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Octane ratings are most definitely not the same everywhere. There are two types of octane test, the "Research Octane Number" (RON) and the "Motored Octane Number". In Europe, fuel is sold by RON. In fact, in most of the world, fuel is sold by RON.

Of course, in the USA, things have to be different. Typically the MON number is lower than the RON number by about 4. MON represents high load, high speed driving conditions and the test was developed by the Germans since they have the highest speed road network.

Because the Americans never drive anywhere at high speed (their idea of fast doesn't go beyond 100 mph ) they felt the need to include the MON rating too (sic), despite the fact that for many modern fuels the interval between RON and MON is very consistent. Then they invented a new measure called "Pump Octane Number" which isn't a better test (like the Germans invented) but is just a lame-ass average of RON and MON. So typically when US chaps talk about 89 octane fuel they are referring to what we call 91 RON. Of course, being American, they have no idea that the rest of the world exists and so they have no idea that the scales don't match, so they don't feel the need to mention it. You would be frightened to know how many Americans don't realise that the US dollar isn't used everywhere. You would be even more frightened to know that one of them is president.

Unusually for Americans, the number comes out smaller than the rest-of-the-world equivalent. This can be explained by the American oil companies wanting to confuse people from Iowa into buying more expensive fuel than they need for their push-rod iron-head 2-valve motors.

For a less cynical and more factual run-down (in significantly more detail) go to:

http://www.repairfaq.org/filipg/AUTO/F_Gasoline6.html

Damian (UK)
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#5 (permalink) Old 09-05-2004, 02:08 PM
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Blackbird

As far as your low down on the RON MON & PON I couldn't have said it better.

However it's not a good idea to come onto a forum created by, hosted by and frequented mostly by, Americans and then start slagging them off. Just hope they don't tar all of us UK folk with the same brush like you obviously do them.

PS - Do you really drive like a moron with your 2 year old in the car??? ("Are we skidding? That was a good one, daddy!" (Charlotte, 2 years))
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#6 (permalink) Old 09-05-2004, 02:28 PM
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Quote:
Originally posted by d3ity+Sep 3 2004, 10:14 PM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (d3ity @ Sep 3 2004, 10:14 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-e36_m3_Turbo@Sep 3 2004, 08:52 PM
ya ur not from the US. because we only have 89. 91 and 93 octane fuel thats probably why (im guessing) the manuel says that, and euro engines require higher octane fuel
Haha, i can get 94 premium.

and 106 race gas. 2.019 a gallon. [/b][/quote]
race fuel where?

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