Iridium Spar Plugs

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Northstar Engines and System Technical Discussion Discussion, Iridium Spar Plugs in Cadillac Engine 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

    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)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Iridium Spar Plugs

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

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