Gas Octane
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  • 2 Post By 1BadCadSTS
  • 1 Post By Ludacrisvp
  • 1 Post By curtc
Cadillac STS Forum - 2005 through 2012 Discussion, Gas Octane in Past Cadillac Vehicle Discussion; What are the Pros & Cons of running a tank of 93 octane every once in a while in the ...
  1. #1
    Kennyw418's Avatar
    Kennyw418 is offline Cadillac Owners Member
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    Gas Octane

    What are the Pros & Cons of running
    a tank of 93 octane every once in
    a while in the V6?
    Thank You

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  3. #2
    1BadCadSTS's Avatar
    1BadCadSTS is online now Cadillac Owners Connoisseur
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    Beating. Dead. Horse.
    Ludacrisvp and Paul Reed like this.

  4. #3
    malatu's Avatar
    malatu is offline Cadillac Owners Enthusiast
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    Re: Gas Octane

    Typically in this world.... you get what you pay for. Though, this doesn't apply to higher octane fuel (compared to regular octane). Just because high octane fuel costs more doesn't mean it's higher quality fuel! It's just different fuel.

    Learn the purpose of high octane fuel and why it exists. Once you understand that concept, you'll be able to answer your own question.

    In a nutshell, it's for higher compression engines. It has a higher flash-point thus preventing premature ignition within the cylinder during the compression stroke.

    In my opinion, don't waste your money.

  5. #4
    KRSTS is offline Cadillac Owners Enthusiast
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    Re: Gas Octane


  6. #5
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: Gas Octane

    You'll have less money.

  7. #6
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Gas Octane

    Quote Originally Posted by Kennyw418 View Post
    What are the Pros & Cons of running
    a tank of 93 octane every once in
    a while in the V6?
    Thank You
    Only run higher octane if you are having:
    ---
    Engine Knock
    Custom Engine Tune that was configured for it
    Manufacturer recommended (GM doesn't say that the 3.6L or the 4.6L needs it, I assume the 4.4L does though)
    ---

    There are arguments that old engines with a lot of carbon buildup could benefit from it due to the carbon build up increasing the pressure in the cylinder would benefit but I think its just rumor.
    mckellyb likes this.

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    If you're getting knock running 87 in an engine designed for it, there's a problem. Using a higher octane is not a solution, it's a band aid.

    A LOT of carbon buildup can create higher compression, and higher octane can stop the resulting gas knock, but same as above, not a solution.

    Kenny, forget octane. Google top tier fuel.

  9. #8
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: Gas Octane

    I used 87 in my 04 3.6 CTS the majority of the time, ran fine...also run 87 in my 4.6 usually and it seems to run just fine...But like said above, I am conscious as to where I get the gas, only top-tier goes in my car.
    Past Cadillac's

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  10. #9
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Gas Octane

    Yes the 4.4 is 93 and I'd recommend searching for a gas station that doesn't do ethanol. This is a lot easier to find in lower octanes than it is in 93. I got lucky there's one by me. If you're doing searches for cheap gas and a station called "gas sale" or something to that effect comes up, pump at your own risk. If you've never heard of it don't put it in your car.

  11. #10
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: Gas Octane

    Guy.Seminerio likes this.
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  12. #11
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Gas Octane

    Which is exactly how I found my place.

  13. #12
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Gas Octane

    Curt is the man! You do not want corn squeezin's or water in your tank. Ideally, you want pure Top Tier gasoline which contains an additive package that goes a long way towards keeping the throttle-body and intake valves clean. I'm not sure but it's probably predominantly Techron (Chevron) or a close variant.

    Octane is an agent to SLOW the burn rate of the air/fuel mixture. It does not provide more energy. It does allow higher compression engines to use the additional energy released when the mixture is ignited at higher pressures. (Forced induction via turbo or super-charger has been around for a hundred years.)

    Do clean your intake as the manual recommends or more frequently. The STS electronic throttle (fly by wire) isn't as sensitive as the best mechanical throttles but a well maintained intake will prevent jerky starts and other unpleasant behavior. If a grove has been worn by the throttle plate, you really will enjoy the feel of a new throtttle body.

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