I run the 89 w/ ethanol in the alero, but that is because it's 10% ethanol, that goes to farmers here in America instead of oil barons in the mid-east, never had a problem with it. I know my newest car will vary the timing based on feed back from the knock sensor. Basically, the higher the octane the more timing it gets. I don't think the Olds is that smart though.
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I'm on a boat.....
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