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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 10-18-2006, 03:03 AM   #1 (permalink)
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Octane 91 : is it good or bad ?

Hello,

im a newbie here. i just got my first ride bmw 1993 320i, i am using octane 95 before and i just shift to octane 91 since it's a little cheaper. would it damage my engine in long term use? are there any advantages on using the lower octane. Any advise would be appreciated.. Thanks..

regards,

Jerico
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Old 10-18-2006, 10:58 AM   #2 (permalink)
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Where are you located? If we are talking in terms of the same system, here in the US, the recommended grade for BMWs is 91. That is what I run in my car and have had no trouble at all.
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Old 10-18-2006, 12:09 PM   #3 (permalink)
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i run 91...
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Old 10-18-2006, 12:57 PM   #4 (permalink)
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If you were running 95, then my guess is that you're in the UK or Europe? If so, then no, 91 is no good.

To explain to USAers: we have RON+MON/2 here. They don't, and their higher nominal ratings are due principally to a difference in calculation.

That said, their gasoline is still superior to ours--they generally have a much better additives package.
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Old 10-18-2006, 05:53 PM   #5 (permalink)
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hmm 91 is the lower ocatne here in nz, so he could be from here!? if so, i do not think you should be using 91, its a little bit cheaper but it wont be as good for your engine. there is a reason bmw recommends octane 96 or higher.

A few months ago we had octane 96 but they decided it was too dirty so they changed it to 95. thats when i started using octane 98, which is about $5 nzd ($3 usd), more expensive per 60L then octance 91. So really the cost of a higher octane isn't that much higher.

edit: all the jap cars use 91 here.
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Old 10-19-2006, 02:35 AM   #6 (permalink)
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Quote:
Originally Posted by M3UOND
If you were running 95, then my guess is that you're in the UK or Europe? If so, then no, 91 is no good.

To explain to USAers: we have RON+MON/2 here. They don't, and their higher nominal ratings are due principally to a difference in calculation.

That said, their gasoline is still superior to ours--they generally have a much better additives package.
That's what I meant to say.
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Old 10-19-2006, 07:44 AM   #7 (permalink)
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Well over here in Australia, octane ratings range from 95, 96, 98 and even 100 octane and are easily available. Noticable power difference with them as well, i usually stick to 96 in my e30.
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Old 10-19-2006, 11:45 AM   #8 (permalink)
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Wow, we must be way off the back. We have 87/89/91 in most cases here...
Why might that be?
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Old 10-19-2006, 12:46 PM   #9 (permalink)
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Quote:
Originally Posted by PhatCat
Wow, we must be way off the back. We have 87/89/91 in most cases here...
Why might that be?
Have you not been reading? They are two different systems. You, in Canada, have the same system as we do in the US. In Europe and Australia, RON octanage is displayed at the pums. Here in the US/Canada (maybe even the rest of the Americas), we use AKI (anti-kncok index) = (RON+MON)/2

As a general rule of thumb, RON-4 =~ AKI.
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Old 10-19-2006, 12:49 PM   #10 (permalink)
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95 in Europe is regular, so I would not use it in your 320i, jerico.
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Old 10-22-2006, 03:05 AM   #11 (permalink)
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Thanks for the info guys.

Im staying in the Middle East, UAE particularly. They just introduced the octane 91 here a couple of weeks ago. We used to have octane 95, Special. The car was imported in Japan.
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Old 10-23-2006, 11:40 AM   #12 (permalink)
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E+

its not so bad and not so good to me !

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Old 10-23-2006, 11:59 AM   #13 (permalink)
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Quote:
Originally Posted by drz
Have you not been reading? They are two different systems. You, in Canada, have the same system as we do in the US. In Europe and Australia, RON octanage is displayed at the pums. Here in the US/Canada (maybe even the rest of the Americas), we use AKI (anti-kncok index) = (RON+MON)/2

As a general rule of thumb, RON-4 =~ AKI.
As a matter of fact, contrary to popular belief, I can, and do read. I noticed the RON/AKI stuff, but there were no explanations for the difference in the numbers, but...yet again drz, your words have enlightened my state of knowledge on all things concerning motor cars.

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Old 10-23-2006, 08:59 PM   #14 (permalink)
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I'm a BMW newbie as well, and I use 93 octane everytime. I use the mid grade 91 in my other cars though.
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