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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.

Knock Return questions.. 93 SSE

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Old Jul 19, 2006 | 07:26 PM
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J Wikoff
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Originally Posted by MooseGundr
it'* about 25% 87 and 25% 91octane right now, i'm going to fill it up each day for a couple days to bring it up
So what is the other 50%? You'll see the biggest difference all at once if you let the tank get pretty empty, then fill it with premium.
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