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    What fuel brand do you use?

    The 911 Carrera Owner's manual says that using fuels with MMT may negatively affect the emission control system performance. I like to use Sunoco 93 octane, but I believe it does contain MMT (methylcyclopentadienyl manganese tricarbonyl )
    For those of you in the USA, do you know of a fuel brand that is compatible with the 997 engine and that does not use MMT? What brand do you use? Any recommendation?

    Re: What fuel brand do you use?

    back in the east coast I feed my cars sunoco 94 oct, out here in the west coast it's chevron 93 oct.

    Re: What fuel brand do you use?

    Not sure about the MMT.

    I DO add a bottle of BMW fuel additive (techron) every other tankful. Porsche says "no additives" I know.

    Octane? Whatever "premium" gas is, where ever I am.

    AFAIK, the motronics will adjust for ANY octane. You could drive on regular gas w/o problems (less power of course).

    Re: What fuel brand do you use?

    Kevin, did you use the Sunoco with a Pcar back East? Did you get any problem with the emission control?

    Re: What fuel brand do you use?

    Quote:
    Kevin 034 said:
    back in the east coast I feed my cars sunoco 94 oct, out here in the west coast it's chevron 93 oct.



    Where on the west coast are you finding 93 octane Chevron? I've never seen it in So Cal

    Re: What fuel brand do you use?

    Got a response from PCA about MMT...

    Question:
    The 911 Carrera Owner's manual says that using fuels with MMT may negatively affect the emission control system performance. I like to use Sunoco 93 octane, but I believe it does contain MMT. Could you recommend a fuel brand that is compatible with the 997 engine and that does not use MMT?
    Thanks!

    Answer:
    Sounds like MMT is not so good for emissions, here is an excerpt from a report from SAE:


    Emission studies were carried out on clear-fueled and
    MMT(R)-fueled 100,000-mile Escort vehicles from the
    Alliance study [SAE 2002-01-2894]. Alliance testing had
    revealed substantially higher emissions from the MMTfueled
    vehicle, and the present study involved swapping
    the engine cylinder heads, spark plugs, oxygen sensors,
    and catalysts between the two vehicles to identify the
    specific components responsible for the emissions
    increase. Within 90% confidence limits, all of the
    emissions differences between the MMT- and Clearvehicles
    could be accounted for by the selected
    components. NMHC emission increases were primarily
    attributed to the effects of the MMT cylinder head and
    spark plugs on both engine-out and tailpipe emissions.
    CO emission increases were largely traced to the MMT
    cylinder head and its effect on tailpipe emissions. NOx
    emission increases were linked to the MMT catalyst. In
    addition to heavy deposits on the valves and spark plugs
    from the MMT vehicle, substantial deposits were also
    observed on the catalyst, with approximately 20% of the
    channels totally blocked.


    I would avoid any gasoline that uses MMT...

    Re: What fuel brand do you use?

    Quote:
    gmp said:
    The 911 Carrera Owner's manual says that using fuels with MMT may negatively affect the emission control system performance.



    The emission control warranty is 8 years/80,000 miles. Make sure to trade before then!

    I always fill up at Shell here in the midwest. Check out http://www.toptiergas.com

    Re: What fuel brand do you use?

    I use whatever is on my route. I don't buy into the fact that one gas brand is better then the other. Giving that they all come for the same pipeline here in the US. Well 90% of them do. I know each one "adds" their own additives to the gas. But I just don't believe it makes that much of a difference. Now I guess if I was a race car driver or something I would have a different opinion but I'm not.

    Re: What fuel brand do you use?

    I use whatever premium gas that is least expensive. I don't believe there are realistic differences among the brands.

    Re: What fuel brand do you use?

    Depending on the state, most commonly found in the upper plains states is Amoco/BP. I also normally find Shell, Texaco and especially if you are headed into the southern plains states, Conoco. Always premium grade, usually 91-93 RON.

    Re: What fuel brand do you use?

    Chevron or Shell.

    Re: What fuel brand do you use?

    86 Octane

    Re: What fuel brand do you use?

    The link you provided to toptiergas is very interesting. Thanks!!!

    Re: What fuel brand do you use?

    From the Exxon US web page FAQ's:

    Do your gasolines contain MMT?
    In the United States, our gasolines do not contain MMT

     
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