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 ...
- 05-29-09 05:08 PM #1Cadillac 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?
- 05-29-09 07:15 PM #2
Re: Iridium Spar Plugs
I think they are Platinum tipped. A/C Delco 41-987