Iridium XP Spark Plug
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Iridium XP Spark Plug
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Autolite Iridium XP Spark Plug

Part No. XP103 Warranty Details  

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The Iridium XP is Autolite’s most technologically advanced plug ever. These spark plugs provide better durability* and a more focused ignition for better overall ignitability** and optimum performance.

Product Features:
  • Iridium enhanced 0.6mm finewire design for optimal durability and performance
  • Platinum ground wire for maximum efficiency in all ignition types including DIS systems
  • V-trimmed ground electrode for improved ignitability
  • Heat range precisely set by Ionization Sensing Technology
  • Lifetime Limited Warranty
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Electrode Tip Material:Xtreme Performance
Manufacturer Heat Range:G14
Spark Plug Reach:.708 in
Spark Plug Seat Type:Tapered
Spark Plug Thread Size:14 mm
Tip Configuration:Power
Wrench Diameter:5/8 in


by PowerReviews
AutoliteIridium XP Spark Plug

(based on 1 review)

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Reviewed by 1 customer

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(3 of 6 customers found this review helpful)




from Newark, OH

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      Best Uses

      • Everyday Driving
      • Replacement

      Comments about Autolite Iridium XP Spark Plug:

      Used to replace the original plugs in a Ford Ranger that I purchased. The originals that I replaced had 160k miles on them and were in poor shape. I have noticed a small increase in performance and engine response. The effects on gas mileage seem to be minimal. I can't comment on much else as durability is something that only time will show. Also, if you pruchase these, be sure to check the gap. I had to adjust the gap on all 6 plugs that I purchased. If I had to do it over, I would use ordinary copper plugs and saved the money since I do not expect to put more than another 30-50k on this truck before I replace it.

      • Car & Truck:
      • Casual Driver

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      Do you have questions about this product?


      Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

      2 Questions | 2 Answers
      Displaying questions 1-2
      • Q:

        is this plug colder thha stock plug
        Asked on 7/5/2012 by Albert from Miami Fla

        1 answer



          The specification of this part Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug, Part No. XP103: Shorty Spark Plug: No, Resistor: Yes, Manufacturer Heat Range: 3, Electrode Core Material: Copper, Electrode Tip Material: Iridium, Insulator Type: Projected, Spark Plug Thread Size: 14mm, Spark Plug Reach: 0.708 in., Spark Plug Seat Style: Tapered, Wrench Diameter: 5/8 in., Ground Strap Quantity: One.
          For compatibility of this part with your vehicle, please provide your vehicle make, model and engine specification.
          For any further assistance, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and our representatives would be more than happy to assist you.

          Answered on 7/6/2012 by Aaron from AAP
      • Q:

        are these plugs pre gapped
        Asked on 6/1/2011 by Anonymous

        1 answer



          No, Initial suggested settings for spark plug gaps are: Single plug : 0.028 - 0.032", Dual plug : 0.025 - 0.030".

          Answered on 6/2/2011 by Just Ask Jacob! from AAP
      Displaying questions 1-2

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