Iridium Spar Plugs
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Northstar Engines and System Technical Discussion Discussion, Iridium Spar Plugs in Cadillac Engine Technical Discussion; Does anyone know what type of plugs are in the 05 STS V8. Assuming delco but doubting Iridium. Has anyone ...
  1. #1
    lreddiablo is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac
    Join Date
    Apr 2007
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    458

    Iridium Spar Plugs

    Does anyone know what type of plugs are in the 05 STS V8. Assuming delco but doubting Iridium. Has anyone tried iridium in this car? I know Bosch isn't a favorite here, but anyone tried the Bosch IrFusions? Any opinion on what would be the best performing plugs for this car? Delco Iridium? Bosch IrFusion?, something else?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Jun 2004
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    Woodstock Ill.
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    Re: Iridium Spar Plugs

    I think they are Platinum tipped. A/C Delco 41-987

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