Lexus_Racer Posted June 9, 2005 Share Posted June 9, 2005 does anyone know for sure if Iridium spark plug is more powerful or if Copper spark plug is more powerful for a GS400. Different car work better with different kind of spark plug, so i was just wondering which would be more powerful, Iridium or Copper, thank you. Quote Link to comment Share on other sites More sharing options...
dcfish Posted June 9, 2005 Share Posted June 9, 2005 does anyone know for sure if Iridium spark plug is more powerful or if Copper spark plug is more powerful for a GS400. Different car work better with different kind of spark plug, so i was just wondering which would be more powerful, Iridium or Copper, thank you. ← Dealer says use iridium in the 400 and platinum in the 300. Quote Link to comment Share on other sites More sharing options...
Lexus_Racer Posted June 9, 2005 Author Share Posted June 9, 2005 does anyone know for sure if Iridium spark plug is more powerful or if Copper spark plug is more powerful for a GS400. Different car work better with different kind of spark plug, so i was just wondering which would be more powerful, Iridium or Copper, thank you. ← Dealer says use iridium in the 400 and platinum in the 300. ← thankz for info. :) Quote Link to comment Share on other sites More sharing options...
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