- Iridium provides excellent engine idle stability and smooth performance. - Iridium enables small, efficient electrode designs for reliable cold starting and quick acceleration. - Iridium fine-wire electrode helps burn away carbon deposits on the tip of the plug as they form. - One piece suppressor seal helps block radio frequencies that can affect vehicle electronics. - Suppressor seal meters spark energy for long electrode life and helps prevent combustion leakage. - Some GM Original Equipment parts may have formerly appeared as GM Parts (OE) or Professional. - GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors. - GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. - GM regularly updates production and part designs to integrate materials and technologies. Use scenarios: - Daily driving in Chevrolet, Buick, GMC, or Cadillac vehicles that require stable idle and smooth response for comfortable commuting. - Cold climate driving where reliable cold starting and quick ignition response are beneficial. - Vehicles with sensitive electronic systems where suppressor seal helps minimize radio frequency interference and protect electronics.