Xtreme Start Spark Plugs
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Autolite Xtreme Start Spark Plugs

Part No. XST458DP Warranty Details  

Fit of this part varies by vehicle & equipment specs Type of Fit

From lawn mowers to chain saws, this plug provides quicker consistent starts versus the standard plug and an anti-foul design.

Product Features:
  • 0.6mm finewire design offers exceptional fouling resistance for reliable starting in any season or weather condition
  • Up to 26% quicker engine starts than the OE plug
  • Up to 21% less HC emissions than the OE plug
  • Meets or exceeds OE specifications
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Center Electrode Material:Iridium alloy
Thread Reach:0.375
Includes Gasket or Seal:Yes
Seat Style:Gasket
Center Electrode Core Type:Copper Core
Rib Configuration:Standard
Electrode Core:Copper core
Terminal Top Fixed or Threaded:Fixed
Hex Size:5/8"
Number of Electrodes:1
Insulator Type:Standard
Ground Electrode:Nickel alloy
Heat Range:5
Tip Configuration:Ir Finewire
Center Electrode Firing Tip:Finewire
Gasket Installed or Loose:Loose
Center Electrode Tip:Finewire
Thread Size/Diameter:14mm
Side Electrode:Yes
Shell Material:Steel Alloy
Seat Type:Gasket
Thread Diameter:14mm
Electrode Tip:Finewire
Resistor Type:No


by PowerReviews
AutoliteXtreme Start Spark Plugs

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 1 customer

Displaying review 1

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(8 of 13 customers found this review helpful)


gr8 small engine sparkplug


from beaver falls, pa

Verified Buyer
Helpful Reviewer


  • Best small engine plug
  • Improves Performance


    Best Uses

      Comments about Autolite Xtreme Start Spark Plugs:

      best sparkplugs made / champion should go out of business.

      Comment on this reviewHelp Icon

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