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Northstar Engines and System Technical Discussion Discussion, spark plugs in Cadillac Engine Discussion; I have a 97 Deville with a Northstar. Someone told me I could change to a different spark plug (can't ...
  1. #1
    jbl99 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2008
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    21

    spark plugs

    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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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
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    Re: spark plugs

    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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