Premium gas vs regular
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Cadillac STS-V Series Forum Discussion, Premium gas vs regular in Cadillac V-Series Forums; I am a new member, and would like to know if it is safe to use regular gas in my ...
  1. #1
    raccoonroad is offline Cadillac Owners Member
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    Premium gas vs regular

    I am a new member, and would like to know if it is safe to use regular gas in my 2006 STSV. Right now I am getting 21.9mpg and I have 10,000 miles on the car. Can anyone tell me if it's ok to get cheaper gas, or should I just bite the bullet and stay with premium. Thanks

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  3. #2
    AlBundy's Avatar
    AlBundy is offline Cadillac Owners Connoisseur
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    Re: Premium gas vs regular

    Bump(Sorry my comment was for the 2000+ regular N*)...and


  4. #3
    urbanski is offline Cadillac Owners 10000+ Posts
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    Re: Premium gas vs regular

    thanks for joining, please post questions in the proper forum for your vehicle.
    moved

  5. #4
    CIWS's Avatar
    CIWS is offline Cadillac Owners 10000+ Posts
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    Re: Premium gas vs regular

    A tank full (17 gallons) is a difference of what, 5.00 ? How many times during a day / week do you spend 5.00 on things like a starbucks, energy drink, going out and having a few drinks / beers, ordering pizza, etc ?

    Personally I choose to spend the little extra and keep my car running on premium and would gladly give up a coffee or two a week. That's my choice, anyway.

  6. #5
    raccoonroad is offline Cadillac Owners Member
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    Re: Premium gas vs regular

    Please advise, I am sorry if that was not in the proper forum. can you tell me what I should be doing

  7. #6
    CIWS's Avatar
    CIWS is offline Cadillac Owners 10000+ Posts
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    Re: Premium gas vs regular

    They simply moved your thread to the STS-V forum.

  8. #7
    urbanski is offline Cadillac Owners 10000+ Posts
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    Re: Premium gas vs regular

    Quote Originally Posted by raccoonroad View Post
    Please advise, I am sorry if that was not in the proper forum. can you tell me what I should be doing
    welcome to the STS-V forum! i moved the thread here, and now you know where its at. pics of car?

  9. #8
    raccoonroad is offline Cadillac Owners Member
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    Re: Premium gas vs regular

    I know what you mean. I don't really have a problem buying premium. It's just everyone is telling me that it's not necessary. When I reply that it is what the requires, they look at me as though I don't know what I'm doing

  10. #9
    urbanski is offline Cadillac Owners 10000+ Posts
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    Re: Premium gas vs regular

    what does the manual say

  11. #10
    CIWS's Avatar
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    Re: Premium gas vs regular

    Quote Originally Posted by urbanski View Post
    what does the manual say

    If your vehicle has the 4.4L V8 engine (VIN Code D),
    use premium unleaded gasoline with a posted
    octane rating of 91 or higher. For best performance, use
    premium unleaded gasoline with a posted octane
    rating of 93. In an emergency, you can use regular
    unleaded gasoline with an octane rating of 87 or higher.
    If 87 octane fuel is used, do not perform any aggressive
    driving maneuvers such as wide open throttle
    applications. You may also hear audible spark knock
    during acceleration. Refill your tank with premium fuel as
    soon as possible to avoid damaging your engine. If
    you are using gasoline rated at 91 octane or higher and
    you hear heavy knocking, your engine needs service.




  12. #11
    eyekandyboats.inc's Avatar
    eyekandyboats.inc is offline Cadillac Owners Connoisseur
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    Re: Premium gas vs regular

    there is your answer

    Refill your tank with premium fuel as
    soon as possible to avoid damaging your engine

    I fuel all my cars with premium only 93+

  13. #12
    hodgeee1 is offline Cadillac Owners Member
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    Re: Premium gas vs regular

    Yep the owner manual states that you can use 87 if you have to but does not recommend it. It is true on a lot of the tests that have been done lately that you can run the regular on a regular car on a regular day, but your car is not regular, and I am sure you don't always drive it regular either. High compression supercharged motor,

    It's a lot better to run premium all the time on that motor then say a corvette that requires 91 octane due to the vette doesn't nearly run as much pressure in the cylinders as our motors. If you have a vehicle that says that you must use only 91 octane period, then like my brother you can fry out your rings like he did in his Toyota Celica GTS. Cost him $3000 to have the piston rings changed and the engine bored out, due to him thinking that premium is not required!!!!!!

    Fortunately since our motors are highly computer controlled and adjust themselves 32 times per one rotation of the crank, it can detune the motor and back off timing to keep from getting PING or DETENATION when running lower octane in case of an emergency!

  14. #13
    austin's Avatar
    austin is offline Cadillac Owners Connoisseur
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    Re: Premium gas vs regular

    There is a sticker on the backside of my fuel door stating "premium fuel only".. Unless it's been removed, everyone should have one there..

  15. #14
    GM-4-LIFE's Avatar
    GM-4-LIFE is offline Cadillac Owners Connoisseur
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    Re: Premium gas vs regular

    Quote Originally Posted by austin View Post
    There is a sticker on the backside of my fuel door stating "premium fuel only".. Unless it's been removed, everyone should have one there..
    This is EXACTLY what I was just going to post!

    SG

  16. #15
    JenRPh92's Avatar
    JenRPh92 is offline Cadillac Owners Member
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    Re: Premium gas vs regular

    My husband (who never drives my STS-V) went to the gas station to fill it up for me today and the station was out of premium and was close to being out of regular unleaded due to a gas shortage/panic in our area. He fills it up with regular unleaded and sees no problem with that. I on the other hand had a come apart about it!

    My questions are:

    1. Is there an additive that can be added to the gas that's in the car to help correct this?

    2. Should I just be extremely careful until this tank is used up?

    3. Drain the tank and let him sit at home while I drive his truck!

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