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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 10-08-2003, 07:43 PM   #1 (permalink)
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I have a 1995 318ti and I believe the manual says 89 ocatane fuel...
Most of you here have a lot more time with your rides then I do and wanted to double check to see if 89 ocatane is fine.
I know there's another tread regarding bad gas so I will try and stick to the major boys for that.
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Old 10-08-2003, 07:45 PM   #2 (permalink)
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umm if the manual says 89 is fine, go for it. I never put anything but 91 in my car though
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Old 10-09-2003, 12:03 AM   #3 (permalink)
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nearly all BMWs should use 91 or a higher grade of octane, i think the only ones that are fine using 89 are cars like the 2002 and the 2800csi etc etc.
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Old 10-09-2003, 01:10 PM   #4 (permalink)
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i'm pretty sure you can use 89 and the computer senses it. result: "less performance" but no knock. the general rule is use the lowest grade that doesn't make your engine knock, period.
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Old 10-09-2003, 03:22 PM   #5 (permalink)
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lol putting in 87 or "cheapshit" as i call it wont hurt. And as long as there is no major knock you dont gain measurable performance by going up in octane.
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Old 10-09-2003, 05:35 PM   #6 (permalink)
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ya your knock sensor is gonna work overtime. hahaha
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Old 10-09-2003, 10:52 PM   #7 (permalink)
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so what are we agreeing on here boys? 89?
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Old 10-09-2003, 11:42 PM   #8 (permalink)
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I wouldnt use it, but thats just me.
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Old 10-09-2003, 11:52 PM   #9 (permalink)
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my friend had a 92 318is and he still had the sticker from the dealer that said 91 octane recommended under the fuel gauge. your knock sensors should keep it from doing any harm for a while but not for good
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Old 10-10-2003, 08:37 AM   #10 (permalink)
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Guys, I just took my first long trip in my 318ti (about 350 miles). My CD changer doesn't work and I was running out of radio stations I wanted to listen to, so I popped in the Cassette Tape that came with the car (the one that goes over the various features and options). Guess what, on that tape they say be sure and used gas that is rated 89 Octane!!
I'm sure it doesn't hurt to go higher but not sure if it really buys me anything.
I had seen the 89 on the inside of the door jam but I didn't see the words octane along side of it, so I was skeptical. But the tape clearly says use 89 Octane (or higher).

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Old 10-10-2003, 01:29 PM   #11 (permalink)
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right, but octane has do to with oxygen content right? or something like that....anyway, the higher the octane the better efficiency combustion you get (which is why jet fuel is insane octane). that's what i've heard at least....
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Old 10-10-2003, 06:11 PM   #12 (permalink)
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My gas cap says 89 octane on it. Jet fuel is 100 octane. I guess I'll just go with 87 octane and lots of nitro and I'll be fine (lol)!
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