Which gas is better? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-12-2003, 04:46 PM   #1
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Default Which gas is better?

I don't know how many of you live around the Midwest (not many, I'm guessing), but in Iowa ethanol blends are common at gas stations. I bougth my 97 SE with 80k miles on it, and I've always put ethanol blends in it (higher octane and cheaper than regular). Now, I've just lost he O2 sensor (a new one is being shipped right now), and am wondering if the gas has anything to do with it. Is the ethanol hurting my engine or should it be ok regardless. I have no mods yet, but by the end of spring, it will be pretty modded and probably chugging premium, but until then should i switch to plain ol' regular?

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Old 03-12-2003, 06:11 PM   #2
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With an NA engine you can use regular, but the mid grades will be best. Ethenol should be ok for your engine. There was discussion on this in the past (long time ago) and there are alot of race cars running pure ethenol for power gains and what not. I doubt the gas did anything to the O2 sensor. Besides, if you have 80,000 miles on your car and haven't changed it yet, you were overdue. O2'* usually are acurate for around 50,000 miles, and that'* it.
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Old 03-12-2003, 07:07 PM   #3
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Chevon 94 octane is what drink my Beasty drinks And ifin` i can`t find 94 she`ll get by on 92 .nothing lower cuz then she just bitches lots
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