85 Octane is fine for the non-L67 cars right??? - 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 04-06-2005, 03:36 PM   #1
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Default 85 Octane is fine for the non-L67 cars right???

The only sort of gas you can buy in this part of the country is 85, 87, 90/91.

I have switched from 85 to 90/91 many times and no difference at all is noted.

Is there any reason at all to put anything above 85 in a L27????
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Old 04-06-2005, 04:03 PM   #2
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Mine seems to run better with the higher octane stuff, but I have no way to prove that. Could just be in my head.

But.... The discussion has been brought up here before and it seems the general concensus was that unless you're supercharged or highly modded, go with the lowest recommended octane rating.
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Old 04-07-2005, 01:00 AM   #3
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Quote:
Originally Posted by MOS95B
But.... The discussion has been brought up here before and it seems the general concensus was that unless you're supercharged or highly modded, go with the lowest recommended octane rating.
Yes, that has been the general concensus, however, unless I missed something, the lowest recommended octane rating for an L27 is 87 octane. Personally, I wouldn't run less than 87.

Shawn
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Old 04-07-2005, 09:33 AM   #4
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Some places have lower octane ratings. I know that in some places in NM, they have like 86 octane because of the altitude. If you wanted something above that, you'd have to get midgrade (88 octane). I've really never heard of 85 octane. That seems a little low.
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Old 04-07-2005, 11:05 AM   #5
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85 is the regular in Idaho, i remember that...

If you run it and don't have problems, you'll be ok.
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