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Old 09-08-2008, 07:23 AM   #1 (permalink)
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Impala SS Gas: 89 or 93?

In Texas, we have 87, 89 or 93 ... no 91. Would it be safe to run 89 in an 05 SS or do I need to stick with 93?

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Old 09-11-2008, 09:36 PM   #2 (permalink)
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You should run whatever the manual says. If the car was tuned for a higher octane than you are running, it will knock and ping. If you run a higher octane than what it was tuned for, it will be a waste of money.

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Old 09-15-2008, 12:52 PM   #3 (permalink)
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i would not run 89 in an 05 ss.

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Old 09-15-2008, 07:11 PM   #4 (permalink)
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For what its worth...I have a 05 SS and I run 87 in it with no knocking or pinging.

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Old 09-16-2008, 06:16 AM   #5 (permalink)
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like i said i wouldnt. put what the manual says,
it is tuned for high octane so put high octane.

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