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Cheap gas may be damaging your car

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Old 06-04-2004 | 05:04 PM
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Cheap gas may be damaging your car

I know there is a lot of debate on what grade of fuel is best to use in the 8 but now there appears to be another significant concern. Being fairly close to both the auto and petroleum industries I have always been of the mindset that gas is gas, knowing all fuel originates from just a few refineries and the only real difference is additives. Well, not true any more. Fuel with excessive sulfur content is being sold in select US markets (California is one of them) mostly through the off brand independent stations. As a result automobile manufacturers are seeing increases in warranty claims for fuel system related failures. While the performance characteristics of this fuel is comparable, the high sulfur content makes it more corrosive, damaging O2 sensors, fuel sending units and in some cases even corroding fuel lines. I recommend staying away from off brand fuel unless you know they get their fuel from one of the major refineries (Shell,BP etc.).

Edit: It appears some of the majors are doing this too. See Nubos post regarding Shell in the south east.

Last edited by TheDosDog; 06-05-2004 at 09:07 AM.
Old 06-04-2004 | 05:09 PM
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This has nothing to do with the octane rating, then? If I were to get 91 octane from some no-name station, that would be as bad as 87 from the same station?
Old 06-04-2004 | 05:23 PM
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Correct, this related to the quality of the crude and the refining process. Not the octane rating.
Old 06-04-2004 | 05:26 PM
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This is interesting to me.
Though this has been a point of contention with me in many discussions that I have had with others about fuel quality and specs beyond AKI, I'd like to see your data on this.

Where have you seen published reports on sulphur content? That would be good information to add to my compendium of fuel information?
Old 06-04-2004 | 08:14 PM
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Ok, so with that said is there going to be a significant difference between 87 & 91 from a brand name source?
Old 06-04-2004 | 08:24 PM
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We don't have 91 where I live. its only 87,89 and 93 for grades. I use 93.
I did use 87 once because the other grades were not pumping. I have 0 gas and needed to buy some where i was. I saw absolutely no difference in performance. It was only a one time thing.

what are the grades available in parts where 91 is available? 89 91 93?
Old 06-04-2004 | 10:25 PM
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87, 89, 91
Old 06-04-2004 | 11:03 PM
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This happened a few weeks ago in Louisville, Ky. A bad batch of gas caused numerous vehicles to have to have the fuel gauge sensors replaced, and it might have been too much sulfur. Most of the cars ran out of fuel even though the gauge showed some left. The gas company paid for the repair which was pretty expensive for most people, about $500-600. I don't remember the brand but I don't think it was not a major one.
Old 06-05-2004 | 12:34 AM
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I've seen 86, 87, 89, 91, 92, 93 and 94 unleaded and 110 leaded
Old 06-05-2004 | 12:49 AM
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If you change octane it usually will take a tank or two to see any difference...
Old 06-05-2004 | 02:25 AM
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well, can you actually feel the difference between 87 and 91? who put 87 in his 8 here? and does it feels the same as 91 to you?
Old 06-05-2004 | 04:58 AM
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Re: Cheap gas may be damaging your car

Originally posted by TheDosDog
I recommend staying away from off brand fuel unless you know they get their fuel from one of the major refineries (Shell,BP etc.).
Actually, in this report, Shell was the main culprit...
Old 06-05-2004 | 08:16 AM
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Re: Re: Cheap gas may be damaging your car

Originally posted by Nubo
Actually, in this report, Shell was the main culprit...
Which report?
Old 06-05-2004 | 09:24 AM
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Fuel supplies are regional and based on refinery production in a specific region. Many brands "even majors" share supply from the same refineries. There may be no way for us to defend against this issue if we are in a region receiving high sulfur fuel since many stations in a region receive fuel from the same suspect refineries.
Old 06-06-2004 | 01:25 AM
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Re: Re: Re: Cheap gas may be damaging your car

Originally posted by MazdaManiac
Which report?
notice the word "this" was underlined. It's a hyperlink -- click it to go to the report.
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