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| 10-29-2007, 09:13 AM | #1 |
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OCTANE FOR THE TWIN TURBO
So heres a question that I'm sure will ignite (no pun intended) some opinions...
1) In the 135, is it essential to use premium fuel?....and if so, what octane? I've read that certain 'performance' cars are not required to use premium,only recommended, and that modern engines can handle something less w/o any problems such as misfiring et al.If I am misinformed and If you disagree please let me know....i will absolutely use premium if anything less is damaging, performance is enhanced, or if it prolongs life of engine. Conversely, i dont want to waste $ buying premium if i dont need to... 2) What is your favorite "brand" of gasoline and why. Do you feel that one brand is better than the others? Thanks....
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| 10-29-2007, 09:42 AM | #2 | |
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| 10-29-2007, 09:51 AM | #4 |
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As seen with dynos with the 335i, running 91 versus 93 makes a moderate amount of difference in output, and quite a bit of difference when chipped/piggybacked. I won't be skimping out just to save a few cents on a fill-up.
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| 10-29-2007, 09:55 AM | #5 |
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Anyone else want to chime in?
I haven't driven a BMW in years that didn't require Premium 91/93 fuel. I have always been a fan of Mobil, but these days I don't think it matters anymore.
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| 10-29-2007, 10:12 AM | #7 |
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I don't have a favorite brand of gasoline, but I wouldn't put anything less than 93 octane in the 135i. My CX7 has a turbo engine and requires 91 or 93 octane, but I put nothing less than 93 octane in it. I also use 93 octane in my 330Ci.
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| 10-29-2007, 10:16 AM | #8 |
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Although you can use gas with a lower grade than recommended in many engines (the electronics will adjust the engines as needed), you will generally get less performance and poorer gas mileage so there is little to be gained by doing so.
I agree that gas is pretty much the same, but the additives are different. I usually go with the TOP TIER fuels. BMW, Audi, Honda, and Toyota promote them and I don't buy into the belief that they are in colusion with the oil companies. YMMV. |
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| 10-29-2007, 10:24 AM | #9 |
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i know there is a difference between "recommended" and "required" when it comes to premium...Nevertheless...based on your recommendations, I'll stick to 93 octane when I buy the 135.....
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| 10-29-2007, 10:28 AM | #10 | |
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All BMW's require premium fuel, that are all High-Compression engines. Thats not to say that you have too. You can use 89 or 91 Octane all day long and it really won't hurt your engine, but it's not going to help it either. You get better efficiency and your engine runs optimol on 93/94 octane. It really doesn't cost all that much more to just use high-octane, because even though it cost more you get margainally more mpg..! And offcoarse, you loose performance with low-grade fuel.  -Garrett |
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| 10-29-2007, 10:39 AM | #11 | |
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| 10-29-2007, 11:02 AM | #12 |
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For Europe BMW recommends 98 octane gas but 95 octane is also supported with a decrease in power (the ECU will make the necessary adjustments, I guess).
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| 10-29-2007, 11:14 AM | #13 | |
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http://en.wikipedia.org/wiki/Octane_rating |
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| 10-29-2007, 11:19 AM | #14 | |
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Also, some gas stations sell 100 octane UNLEADED race fuel, usually Torco brand around here (at Gas City). You can add a gallon or two of that to skew your average octane level up. At $5 a gallon, it's hardly cheap, but at least the cost of race gas hasn't really increased with the cost of regular gas, making it more of a bargain these days when i costs only 70% more. It used to be about 200% more... I would do so only in extremely hot weather or if you intend to subject the vehicle to extreme duress (IE track events). It iwll prevent the ECU from retarding timing and keep power levels up. |
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| 10-29-2007, 12:03 PM | #15 | |
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 You see higher octane gas in the mid-west and eastern seaboard, than you do out west!Quote:
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| 10-29-2007, 12:32 PM | #17 | |
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| 10-29-2007, 02:05 PM | #18 | |
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| 10-29-2007, 03:11 PM | #20 |
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Premium fuel is required in various manufacturers engines for optimal engine performance, even including my VW MKV GTI. It will operate on regular fuel, but not well.
There is a big quality difference in brands of fuel. Quality in fuel is unrelated to price. For a informative overview, read http://toptiergas.com/. |
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| 10-29-2007, 03:28 PM | #21 | |
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