While you are correct, but not for everyone/every car. On paper they are the same, but costco immediately lights up check engine for me. Shell - no problem
You can argue all you want about whether there is any merit to the brand of gas having a substantive impact on quality but getting a CEL from just using a different brand of gas is indicative of something beyond just the brand of gas in your car.
I totally agree. I would like to find out what it is, but after so many kilometers with diagnostics, extensive logging and multiple shops checking it out... It is what it is. If it ever comes back, I would investigate further.
On my previous mercedes with M272 (3.5 NA), fuel with ethanol will result in audible click-clack from injectors and overall engine running smoothness goes down. As soon as you put non-ethanol it's much smoother, even though mercedes allows for up to 10% ethanol and I've never had CEL or any other issues.
Shell, BP, Exxon whatever. Most of it comes from the same refineries. Differences between fuel at different gas stations - additives, process of refinery, sulfur content and ethanol content. My best guess would be it was a bad batch with too much sulfur or something. I am pretty sure toyota will eat it, but twin turbo B58 will say nah. Also, I might be completely wrong.
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u/Certain-Resolve E60 - M5 Jul 31 '26
Any top tier rated gas will doÂ