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I have a 97 Deville with a Northstar. Someone told me I could change to a different spark plug (can't remember what it was) and I could use regular unleaded gas. Is this true? Thanks
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Your car was supplied with the GM plug sourced from DENSO which is now known as ACDelco Professional Platinum #41-950. It's all you need, 87 or aviation 110/120 gasoline.

Whatever your owner's manual calls for is the fuel you should run for maximum efficiency, BUT the Northstar uses a knock sensor to detect fuel/mixture problems, so you can run 87 with a loss of a tad of performance.
 
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