Autolite Copper Spark Plug 25
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Autolite Copper Spark Plug 25




Part #25
Ground Electrode DesignTapered
Gap - Factory Preset1.1 mm = 0.044 in
Ground Electrode ConfigurationSingle
Ground Electrode MaterialNickel
Electrical Terminal TypeStud
Reach (in)0.431
Center Electrode Tip MaterialIridium
Center Electrode Core MaterialCopper


Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed ors design requirements. Consider upgrading to Autolite platinum, double platinum or iridium XP plugs for improved engine performance. Copper Core plugs are the industry standard.

  • checkmarkOne-piece terminal post adds strength
  • checkmarkCopper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
  • checkmarkResistor reduces radio frequency interference (RFI) and electrode erosion
  • checkmarkMulti-rib insulator reduces danger of "flash-over
  • checkmarkCold-formed steel shell precision rolled threads
  • checkmarkFull Copper Core electrode provides better performance in all conditions