What fuel do you use in your SX?
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Thread: What fuel do you use in your SX?

  1. #1
    Driver's License Bluemarlin87's Avatar
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    Arrow What fuel do you use in your SX?

    I was told to only use 87 (by the dealership... So....) but don't turbos usually call for a higher octane? Any problems if I go with a higher one?

    Thoughts / comments here are appreciated!
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  3. #2
    Learner's Permit Wankel's Avatar
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    I'm pretty sure this has been talked about, and lots of people are confused. But let me be the first to tell you -

    Turbo engine = highest octane, I don't care what others say.

    If you want full power, fill it up with 91 or 93 if available, if you drive in ECO mode all the time and don't care about the power then 87 is fine, but then this raises the question, why did you buy an SX to begin with?

    Yes the dealer will say 87 is good, but im pretty sure they didn't produce the numbers based off of 87, and neither are the companies producing performance products for the car.
    Last edited by Wankel; 11-21-2011 at 12:00 AM.

  4. #3
    Driver's License Bluemarlin87's Avatar
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    No ECO for me, and I am going to start filling up with higher octanes... They made it seem like it would actually HURT the turbo/engine, and I didn't quite understand that.
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  6. #4
    Learner's Permit Wankel's Avatar
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    They are all about the ECO thing, they developed the engine to be conservative on fuel, and get a good rating. I guarantee you the fuel ratings wouldn't be as good if they didn't add all this technology into the ecu and turbo system, and actually used a decent sized turbo.

    The ECO mode actually makes me mad, it forces the engine to run on vacuum unless you really get on it, and while for cruising that's fine, but it takes all the response that a small turbo offers and throws it out the window.

  7. #5
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    It sure would be nice if someone did a dyno or dragstrip or even a good stopwatch test to quantify if higher octane would allow the turbo to perform better.

    Sure, octane doesn't by itself give more power, but it has not yet been made clear to this reader of this board whether higher octane might allow agressive ignition timing before the chip tells it to back off by sensing preignition.

    The ECO mode is fine with me when I'm easing down the road with my wife aboard. I know when I'm in "performance mode" and it's only a small % of the time; then it's off and it's paddle shifter time. The rest of the time, 34 mpg on the interstate is dandy !
    Black SX, built Jan 2011, fully loaded, tinted, flying K rebadged, subtly pinstriped, splash guards, upgraded hi beam halogens (Narva Rangepower +50s), hardwired Valentine detector. Winter setup: 215/55R-17 Michelin X-Ice Xi2 on 17x7 Kosei rims; WeatherTech mats. Summer setup: 18x7.5 Enkei Performance Lusso Hyper Silver rims with P225/45R-18 Michelin Primacy MXM4


  8. #6
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    i can't wait till the other more informed users see this thread... someone in here is going to get ripped a new one...

    i dont know all the tech jargon, but I do take heed in what the more techy users say... even a quick search will yield desired results.

    the car takes 87... that's what the book says, that's what I put in it.
    From Shell.
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  9. #7
    OptimaForums Veteran OptimaSX's Avatar
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    Happy to chime in on this.
    Without going over old posts, I will simply tell you, octane is not a performance enhanser! Octane retards fuels tendency to pre-ignite under high temps and pressures.

    These engines are not your usual Fuel Injected, turbocharged pos that other manufacturers have used, and are phasing out.
    Ours are the newer, more efficient, higher performance, of smaller displacement turbo's, and GDI, turbo or not, is controlled very precisely by the computer, else they'd destroy themselves.
    Unless you change hardware and the computer parameters, you'll find the only time running higher octane will be when outside Temps are high...about 100 degrees, over several days or when driving under extreme conditions....like maybe Death Valley, or the Outback!

    If you want to use anything other than what's recommended, go ahead, waste your money.
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  10. #8
    OptimaForums Veteran Jhall520's Avatar
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    Quote Originally Posted by GenXisT View Post
    i can't wait till the other more informed users see this thread... someone in here is going to get ripped a new one...

    i dont know all the tech jargon, but I do take heed in what the more techy users say... even a quick search will yield desired results.

    the car takes 87... that's what the book says, that's what I put in it.
    From Shell.
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  11. #9
    Certified Wrench Monkey
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    I said it before, and will say it again.

    Run several full tankfuls of premium. See how the throttle response is and calculated (not indicated) mp3 - record miles traveled at each filllup and divide by gallons used.

    Repeat the same with 87 octane. Continue using which ever fuel gives you the best throttle response and better mpg. Of course, you need to account for the greater cost of premium for this all to make sense.

    Personally, for the way I drove, it wasn't cost effective effective to use premium. Also, you should wait until the car has at least 5K miles or more before expecting accurate results.
    2011 Optima sx <---- Good riddance!!

  12. #10
    Administrator Munky's Avatar
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    This has been discussed multiple times, and has been proven time and time again that premium is a waste of money. These cars were designed to run on 87 octane.

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