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Date: Thu, 3 Mar 2005 21:29:17 -0500
From: "WitchDr" <Witch**DRnospamnobulkemail.net.ru>
Subject: Re: Saab 9-3: What octane to tank?


If you have a normally aspirated engine or a low pressure turbo, use the lowest octane gas available. Most NA cars adjust and are designed to use the lowest octane gasoline. Turbos are different since you have a much higher compression, you need detonation resistance. I have a Viggen with a high pressure turbo. I use 92 octane all of the time because without it, the computer will most likely retard boost. On every other car I've had that was non turbo, there was never any benefit to using high octane. Every once in a while I get knocking in a Pontiac and at that point I will put Super in and the problem is gone. "Happy" <notnospamd.com> wrote in message news:4223a3ae$1nospam.microsoft.com... >I have tried 87, 89, 92 with no noticable difference, although I suspect to > feel a more little vibration when idling on 87. > > The manual recommends 92, but says it can run lower grade as well. > > The only reason why I will tank 92 would be if 87 would be bad for the > engine or shorten its lifetime. If I were to reason about this, I would > actually think that 87 causes lower heat and less violent explosions, > actually prolonging the lifetime. But I suspect it doesn't work that way > :-) > > Any recommendation, experience? > > What do you use? > > >

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