What Octane Level are you guys using in your Sevilles?
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Cadillac Seville / Cadillac Eldorado Forum Discussion, What Octane Level are you guys using in your Sevilles? in Past Cadillac Vehicle Discussion; Just curious does anyone here use higher than 87 Octane gas in their Seville Northstars, I've only used 87 Octane ...
  1. #1
    rayman3399 is offline Cadillac Owners Member
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    What Octane Level are you guys using in your Sevilles?

    Just curious does anyone here use higher than 87 Octane gas in their Seville Northstars, I've only used 87 Octane for the 9 years I've had my 2003 Seville STS, just wondering if anyone here is using 89 or 91 Octane gas and if you have noticed any increase in mileage or better performance.
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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: What Octane Level are you guys using in your Sevilles?



    PLEASE do a search so we don't start another gas war.
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  4. #3
    bwv565 is offline Cadillac Owners Enthusiast
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    Re: What Octane Level are you guys using in your Sevilles?

    My dealer recommended 89, so that's what I use.
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  5. #4
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    89 makes even less sense than 91.
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  6. #5
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    vincentm is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by Ranger View Post


    PLEASE do a search so we don't start another gas war.
    Cant we just close this?
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  7. #6
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: What Octane Level are you guys using in your Sevilles?

    the CORRECT answer is -

    UNLESS you are towing a trailer - or driving straight up a mountain -
    you will get exactly ZERO BENEFIT -
    from using anything but 87 octane fuel - PERIOD -
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  8. #7
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: What Octane Level are you guys using in your Sevilles?

    When all else fails, read the owner's manual.
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