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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-18-2007, 09:15 PM   #1 (permalink)
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fuel question

hey guess i have a silly question for u all, what octain would be best to put on my car?

ps i dont care about spending more or less for fuel.
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Old 03-19-2007, 09:48 AM   #2 (permalink)
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after putting in a chip I have to use 91+ octane....

before the chip I used the middle grade (sorry don't remember the octane number)

not sure what your supposed to do...
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Old 03-19-2007, 05:31 PM   #3 (permalink)
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Yeh I use Shell 91 octane with my Dinan chip.
I use the same 91 octane before the chip with new motor.
Old motor I ran 89 octane I believe the middle grade, no problem.
We used to race a 2002 on lower octane because it actually ran better.
My question is whats the best brand shell, chevron, mobil etc?
Its all the same base gas run through the same pipe out here.
Then Shell or Chevron put in thier additives detergents etc.
There is a great del of info on this subject out there.
Bottom line if chipped use high octane or risk detonating your motor LOL.
PS if you dont have a chip and want one for i motor and -173 ECU ask me about it offline.
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Old 03-19-2007, 05:43 PM   #4 (permalink)
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Like it was said above, if chipped use 91+. If not use mid grade, 87 is the crap you put in your lawn mower.....
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