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I think it means...
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Posted by B Millar [Email] (#1109) [Profile/Gallery] (more from B Millar) on Tue, 27 Oct 2009 20:56:48 Share Post by Email
In Reply to: Re: Huh? Please explain your statement, TG, Tue, 27 Oct 2009 20:39:45
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...that with the increased temperature you might notice some pinging before Trionic retards the timing to compensate for the heat and low octane. This is taken directly from the 2004 9-5 Owner's Manual on page 156:

"Be sure the posted octane is at least 87. If
the octane is less than 87, you may get a
heavy knocking noise when you drive. If it’s
bad enough, it can damage your engine. If
you’re using fuel rated at 87 octane or
higher and you hear heavy knocking, your
engine needs service. But don’t worry if you
hear a little pinging noise when you’re accelerating
or driving up a hill. That’s normal,
and you don’t have to buy a higher octane
fuel to get rid of pinging. It’s the heavy, constant
knock that means you have a problem."


And from page 154:

All Saab gasoline engines can be driven on
fuel of grade AON 87–93.
For optimum performance we recommend:
• AON 90 for 2.3t
• AON 93 for 2.3Turbo and 2.3T, (see page
272).

TG is right though. The engine is "tuned" to run on the good stuff. I never put anything less than 91 octane in my Aero. I wouldn't worry about damage or continuous pinging if I did decide to put 87 in there, but I couldn't live with the performance downgrade.

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