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Thread: Arco gas????

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    Member riversidedan's Avatar
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    Default Arco gas????

    With the price of gas these days am wondering if anyone here uses ARCO PREMIUM, if so have you had any problems?

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    Arco gas???? Red Vette's Avatar
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    I use top tier gasoline in my vettes as recommended by GM to keep injectors and valves clean. I was wondering about the C7 that by-passes the washing action of the valves with direct injection. I believe GM recommends top tier to keep contaminants off the injectors. From what I read, unless you install a catch can on youir C7, your valves will coke, especially Z51 models.

    The internet lists the top tier retailers and more are added as they comply with the car company specifications. For a while, the list was fairly limited to Texaco, Shell, Phillips-Conoco. The list has been expanded since my last search, and I see that Arco has been added along with BP, Exxon, Mobil, and others. Makes the choice easier as I travel back to the NCM. I would think that Arco would be a wise choice. Only in a pinch will I use non top tier fuels such as Sinclair and several others. Last year I filled with Pilot premium in Kansas on I-70 and the 02 coupe did not run well. Learned my lesson. Don't forget, it is the cleaning action with the detergents and other additives that GM wants you to use to lessen engine deposits. After the Pilot incident, I now carry a list (from Google search) of top tier gasolines, and always use premium. Why have an expensive performance vehicle and use low grade fuel to save some change? BTW, our resident expert, C4C5specialist does not recommend the use of lower octance fuels - he gave a very informative seminar on this at our last CruseFest at Mid America Motor Works. I always follow his advice; thanks Paul!

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    Moderator catbert's Avatar
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    Interestingly, Costco now claims top-tier status for their fuels. Not only that, they claim they add 5 times the detergent required by the standard.
    Last edited by catbert; 07-05-14 at 01:04 PM.
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    Quote Originally Posted by catbert View Post
    Interestingly, Costco now claims top-tier status for their fuels. Not only that, they claim they add 5 times the detergent required by the standard.


    I just started using Costco fuel, $.30 a gallon cheaper than any other Top Tiers in my area. You really want to use Top Tier fuel in any vehicle (even 87 octane vehicles) to keep carbon build up to a minimum for 1) the injectors (even more important with direct injection), 2) the intake valves, and 3) the top of the pistons and ring lands. A lean mixture or misfire (dirty injectors and carbon on the intake valves), or detonation (carbon build up on the pistons) will result in the PCM pulling back ignition timing and reducing power output and fuel mileage. You actually do get what you pay for with Top Tier fuels.
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    I use Costco for two reasons; it is top tier fuel. Also due to Costco and SC tax it is a lot less expensive than NC gas. Plus, the tune on the Corvette requires 93.

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    Member WhalePirot's Avatar
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    Quote Originally Posted by riversidedan View Post
    With the price of gas these days am wondering if anyone here uses ARCO PREMIUM, if so have you had any problems?
    Yes, and no. Ran that and Costco fuels with no issues of late.

    Once upon a time I found ARCO to be corrosive to the TBIs, but I heard their formulation changed long ago.
    Last edited by WhalePirot; 07-14-14 at 04:55 PM.

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    thanx for the replys but seems to be all Im hearing is "hear says" and no confirmations

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    Quote Originally Posted by riversidedan View Post
    thanx for the replys but seems to be all Im hearing is "hear says" and no confirmations
    The Top Tier website states very clearly that Arco meets their standards. What more proof do you want?

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    Quote Originally Posted by WhalePirot View Post
    Yes, and no. Ran that and Costco fuels with no issues of late.

    Once upon a time I found ARCO to be corrosive to the TBIs, but I heard their formulation changed long ago.
    Judging by your engine specs those "issues" are important; my Corvette is boosted so they are important here also.

    I'm not a fan of alcohol in gas. It can be corrosive to certain engine and rubber components.

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    Quote Originally Posted by riversidedan View Post
    thanx for the replys but seems to be all Im hearing is "hear says" and no confirmations


    Arco has traditionally been a fuel to stay away from, but now that they are Top Tier that could change. They have not been a Top Tier fuel very long so any confirmations of the quality of the fuel would be suspect anyway. I am even suspect of Costco Top Tier fuel since it is so new to me, but it is less expensive enough ($.30 a gallon) for me to try it and see how it works. I have noticed that Arco fuel prices have increased quite a bit lately, the Arco and Chevron that I pass every day are only $.03 difference now and for that small of a difference I would say to stay with the known quality fuel, Chevron. Top Tier is only a detergent package and is no assurance of quality fuel, so you have to try each brand and decide for your self, but I would recommend to chose a Top Tier fuel no matter the brand. Good luck with it.
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    Its not that Im for or against ARCO these days gas prices have gone crazy so I think everyone wants the lowest price they can find, however I donot want anything that will harm the vette! Ive been using chevron and think its a good "techron" fuel but am also reading others who use other fuels, so sometimes ya don't know what to think, As for ARCO I think its time to start asking these station owners some questions

    just curious, what are the signs of using bad gas in our vettes??
    Last edited by riversidedan; 07-14-14 at 08:44 PM.

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    Quote Originally Posted by riversidedan View Post
    Its not that Im for or against ARCO these days gas prices have gone crazy so I think everyone wants the lowest price they can find, however I donot want anything that will harm the vette! Ive been using chevron and think its a good "techron" fuel but am also reading others who use other fuels, so sometimes ya don't know what to think, As for ARCO I think its time to start asking these station owners some questions

    just curious, what are the signs of using bad gas in our vettes??


    Taking longer to start (longer cranking of the engine before starting), misfire, lumpier idle, and fuel mileage and power. I monitor fuel mileage carefully, but it is hard to do since ambient temps and driving habits change constantly. It takes a long time to come up with a valid comparison, but with the on board computers and the DIC it is a little easier. I always make sure that I see a problem (or a non-problem) at least 3-4 times before I make any conclusions, and even then I keep monitoring the situation for any discrepancies. Good luck.
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    Member Vettehead Mikey's Avatar
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    Quote Originally Posted by riversidedan View Post
    just curious, what are the signs of using bad gas in our vettes??
    Bad gas is usually defined as contaminated gas, most often from water. Depending on the concentration, there's anywhere from no effect to unable to start with everything in between.

    If you're trying to suggest that some brands of gas are better than other, consider that all gas comes from maybe 1 or 2 regional refineries and not a different facility for each brand.

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    Moderator catbert's Avatar
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    Bad gas is also gas without enough of the rights detergents and other additives to prevent deposits on the valves and injectors.
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