Do I HAVE to run 93 octane in my SSEi? - 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 04-05-2005, 11:58 PM   #1
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Default Do I HAVE to run 93 octane in my SSEi?

Gas here in VA is hitting $2.39 for 93! Is there no end in sight to the greed of OPEC???

Um, for everyday, mediocre commuting... can I use 89? How about 1/2 & 1/2? ANYTHING!!! I can't afford to drive my Bonnie, and I just had to put new brake hoses and a polyu. sway link kit in it. (Some chuckle-head put a cheapo link on ONE SIDE of the car, with predictable results- ie, the link pretzelled and mushed the little weak rubber bushings). The car handles like a million bucks, but unfortunately it takes about that much to fill it anymore!

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Old 04-06-2005, 12:07 AM   #2
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I think 91 is all that is required per GM. might be able to get away with 89... not sure though
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Old 04-06-2005, 12:07 AM   #3
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Got 91 around? That'* midgrade at some places around here. It'* the minimum suggested by the factory.
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Old 04-06-2005, 12:13 AM   #4
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Bite the bullet.

Internal damage isn't worth it. Even 93 gas today is crap.
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Old 04-06-2005, 09:04 AM   #5
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Stick with what'* recommended. Part of the cost of having that Supercharger.

That price isn't too high, by the way. Here it'* $2.54 for regular. Insane.
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Old 04-06-2005, 11:05 AM   #6
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Whatever you do, don't use 87. If you're engine is running perfect, is tuned up nicely, you may be able to pull off 89. However, not if you have a pulley.

Thermostat
Exhaust work
colder range plugs

Might all help you get to be able to use 89. However there'* still a risk of detonation, especially if you have a heavy foot. 91 or higher is recommended, so maybe mixing 93 and 89 if you don't have 91 in your area is possible.
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Old 04-06-2005, 11:54 AM   #7
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I realize he'* moded and needs the extra octane. I thought the factory manual says you can use whatever, just don't expect performance w/o super duper.

Right now I'm running 87 and it'* got power and enjoying life. I was trying not to give it super, cause I'd get hooked on the power.
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Old 04-06-2005, 12:07 PM   #8
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Over time, that'* bad for your car. In the winter, with no heat, you can probably get away with a lower octane and not get knock, but I wouldn't run anything less than 91 in the summer for damn sure.

The funny thing is that I ran mid-grade here for awhile as a test with my scantool. Our local grades are 87/89/92. With 89 in the winter, I get about 5 of KR. In the summer, it'* BAD. 10-15 as compared to 92. Summertime, it cuts my efficiency so bad, it'* actually cheaper in fuel costs to run the 92 because I get better mileage.

So my suggestion (try it yourself to prove it) is that in a PINCH, 89 will probably fly on a STOCK SSEi for winter use, but in the summer, it'* actually costing you more money in fuel in the long run, and potentially damaging your engine.
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Old 04-06-2005, 01:24 PM   #9
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Yeah i wouldn't do it in 95 degree heat... Is there a site that shows winter/summer fuel and when it'* out?
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Old 04-06-2005, 01:38 PM   #10
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could he use an octane boster for the days he does fill up with 87, im unsure of the cost or if that crap even works...............yeah like what vital49 said, in Wisconsin for 87 its about 2.36 and that like 87 cents of state and federal tax.......thanks wisconsin lawmakes, AND NOW THEY ARE GOING TO TAX BEER!!!!!!!!! but thats another story.....

nicky :(
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