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Old 02-18-2004, 12:00 AM   #31
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i actually heard that only sunoco is recommended by bmw for the m3 nothing else.
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Old 02-18-2004, 02:11 AM   #32
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Originally posted by jps
I cant believe americans have not upgraded their refinreies to be able to porduce 98 octane!

I'm in Australia and I think its pathetic we deont have ours upgraded to have an octane rating of over 100 jsut like that japenese!
Um, you may want to know this important piece of info: We (North America) use a different octane scale. 91 here is equivalent to 98 elsewhere. It's the AKI vs. RON scales.

So technically, we have 101 or so here.
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Old 02-18-2004, 04:50 AM   #33
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I put 87 in my baby.
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Old 02-20-2004, 09:09 PM   #34
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Originally posted by BMW_M52_M20
Actually Bimmerman, you aren't 100% wrong, Sunoco 94 has detergents in it that are very powerful in removing build up in the injectors. Three tanks of 94 in the e30 and the start ups were a lot smoother.
huh? I posted something in this thread?
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Old 02-24-2004, 08:18 PM   #35
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More realistically you would lower your gas mileage since the higher the octane, the harder it is for your car to ignite.

Hello Everyone, I just wanted to introduce myself. I have been watching these threads for over a year now, but decided to register now. I have an 89 325i that I can never seem to stop modifying. Located in Sunny Florida. I wanted to say that this quote is not exactly true. I'm not sure about worse gas mileage, but it ISN'T harder for your car to ignite. A higher octane fuel is more refined than a lower octane fuel, as lower fuels pre-ignite before the piston reaches dead top. Higher octane fuel resists this pre-ignition by only igniting near the top of the cylinder walls, driving the piston down with greater force than a lower fuel. Yes, it is true that some engines are designed to use lower octane fuel and would not benefit from anything else, but with higher mileage engines, I wouldn't feel comfortable having my pistons igniting at different times.
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Old 02-24-2004, 11:00 PM   #36
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Welcome to the board, E30Demon!
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Old 03-01-2004, 12:26 AM   #37
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In the winter you should put 87 in because your car will run better and consume gas more efficiently in the cold.
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