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Guaranteed to deliver quick starts, good fuel economy and smooth acceleration. The copper core increases the rate of heat conduction in the spark plug tip and improves resistance to all types of fouling.

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

Spark Plug Type Performance Differences

How to Install Autolite Spark Plugs

Spark Plug Types
Spark Plug Firing Tips Tech Info
Center Electrode Core MaterialCopper
Electrical Terminal TypeRemovable Nut
Center Electrode Tip MaterialNickel
Center Electrode DesignStandard / Regular
Ground Electrode Core MaterialNickel
Ground Electrode ConfigurationSingle
Ground Electrode DesignTapered
Ground Electrode Tip MaterialNickel
Insulator MaterialCeramic
Insulator TypeShort
Reach (in).752"
Manufacturer Heat Range Number300
Gap (Factory Preset).025"
Thread Size18mm X 1.50
Drive Size13/16" (21mm)
Seat StyleGasket
ResistorNon Resistor

Closeout Inventory Warranty Information:
Wholesaler Closeout items have a 30 day warranty (but still are covered by our Return Policy).

AUTOLITE Regular Inventory Warranty Information:
2 years for Copper Spark Plugs; 4 years for Platinum Spark Plugs; 5 years for Double Platinum Spark Plugs; Limited Lifetime years for Iridium XP Spark Plugs; 5 years for Professional Series Wire Sets; 1 year for Glow Plugs
Warranty Details