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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 11-14-2009, 04:19 PM   #1 (permalink)
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what octane fuel...
What octane fuel should i use for my e30 320i. It is an m20 engine with bosch motronic. Should i use 91 or 95 octane?
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Old 11-14-2009, 08:19 PM   #2 (permalink)
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Is there no label on the fuel door? The 325i 2.5 is supposed to run on regular; when they don't run right, it's due to glowing carbon deposits causing pre-ignition.
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Old 11-14-2009, 08:55 PM   #3 (permalink)
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there is no label on the fuel door.
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Old 11-15-2009, 05:14 PM   #4 (permalink)
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I ran super witch is usually 93 when I bought the car till now, I use regular and everything seems the same.
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Old 11-16-2009, 12:32 AM   #5 (permalink)
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is regular 91 octane?
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Old 11-16-2009, 09:12 AM   #6 (permalink)
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Regular is 87
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Old 11-17-2009, 07:57 AM   #7 (permalink)
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I own a E30 325i and use 95 octane. It runs smooth with it.
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Old 11-17-2009, 12:06 PM   #8 (permalink)
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I used 91 a few times. It was a waste of money. My car actually runs better on 87.
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Old 11-18-2009, 05:05 AM   #9 (permalink)
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where i live RON 91 is lowest grade RON 95 is premium and 98 is high octane.
I have been using 95, so considering you guys run on 87 i might try 91
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