Autolite XP Iridium Spark Plug XP104
  • Thumbnail  Autolite XP Iridium Spark Plug XP104
  • Thumbnail  Autolite XP Iridium Spark Plug XP104

Autolite XP Iridium Spark Plug XP104




Part #XP104
Ground Electrode DesignTapered
Seat StyleTapered
Metal TypeIridium
Gap - Factory Preset1.3 mm = 0.052 in
Electrical Terminal TypeStud
Reach (in)0.679
Center Electrode DesignFine Wire
Insulator TypeProjected
Center Electrode Core MaterialCopper
Thread Size14 mm x 1.25
Drive Size5/8 in
Ground Electrode ConfigurationSingle
Center Electrode Tip MaterialIridium
Ground Electrode Core MaterialNickel Alloy
Insulator MaterialCeramic
Resistance (Ω)4000
Ground Electrode Tip MaterialPlatinum
Package Quantity1


Our best spark plug! Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, the Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6 mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition for enhanced ignitability and performance. Features double iridium-enhanced alloy technology center electrode for improved durability and wear resistance.

  • checkmark0.6 mm finewire design improves ignitability
  • checkmarkPatented V-trimmed platinum sidewire technology resists we
  • checkmarkOE equivalent design is engineered for every engine
  • checkmarkDesigned for better overall durability with virtually no gap erosion