Autolite XP Iridium/Spark Plug

Vehicle Specific
Part Number: XP3924
Features & Benefits

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. Autolite is an official NASCAR performance partner.

  • 0.6 mm finewire design improves ignitability
  • Patented V-trimmed platinum sidewire technology resists wear
  • OE equivalent design is engineered for every engine
  • The official plug of NASCAR
Product Details
Part Number: XP3924
Weight: 0.106 lbs
Center Electrode Core Material: Copper
Center Electrode Design: Fine Wire
Center Electrode Tip Material: Platinum/Palladium/Iridium Alloy
Drive Size: 5/8 in
Ground Electrode Tip Material: Platinum Tipped
Insulator Material: Ceramic
Insulator Type: Projected
Package Quantity: 1
Resistor: Yes
Seat Style: Gasket
Thread Size: 14 mm
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.
Rebate details: AutoZone Exclusive Spark Plug Rebate Offer! Purchase Autolite® Spark Plugs to receive rebate on Autolite Iridium XP Enhanced Alloy Technology(TM) and Autolite® Double Platinum Spark Plugs
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    Autolite XP Iridium/Spark Plug

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    5

    This review is hidden because you have chosen to ignore Member 1403122455. Show DetailsHide Details

    More bang for your buck

    gas mileage went from 13.8 to 18.1

    Pros: improved gas mileage

    Cons: none so far

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    1

    This review is hidden because you have chosen to ignore Member 2340461. Show DetailsHide Details

    Autolite XP

    5 of 5 people found this helpful

    I am really sorry I had to write this but, These plugs are really bad. I went from get 39 - 44 mpg to 34- 36 mpg. I cant understand what Autolite did to make these plugs so bad. I had them Gapped Prefect @ 40. 26,000 miles late the gaps are 40, 55, 45, 45.they were burnt and had a sticky "glue" on them. I have used Autolite for over 35 yrs.
    I just installed Denso Iridium long life plugs and after 3 weeks, my MPG are up to 41. I would not recommend Autolite for Toyota Corrolla's.

    Pros: Cheap

    Cons: Poor gas mileage

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    Edited on 8/1/2014 by Editor

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