Autolite Double Platinum Spark Plugs
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Autolite Double Platinum Spark Plugs
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Autolite Autolite Double Platinum Spark Plugs

Part No. APP646 Warranty Details  

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This premium plug provides outstanding performance and platinum-to-platinum firing

Product Features:
  • Super conductive Yttrium enhanced ground electrode provides superior heat transfer
  • Platinum enhanced high nickel alloy side electrode maintains precision gap
  • Platinum tip assures virtually no gap erosion for longer plug life
  • Easier starts, quicker acceleration and improved fuel efficiency
  • Heat range precisely set by Ionization Sensing Technology
  • Lifetime Limited Warranty*
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Electrode Tip Material:Double Platinum
Manufacturer Heat Range:F12
Spark Plug Reach:3/4 in
Spark Plug Seat Type:Gasket
Spark Plug Thread Size:14 mm
Tip Configuration:Power
Wrench Diameter:13/16 in


by PowerReviews
Autolite Double Platinum Spark Plugs

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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(1 of 2 customers found this review helpful)


Autolite Double Platinum Spark Plugs


from Westminster, CO

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3 or more reviews submitted


  • Durable
  • Improves Engine Efficiency
  • Increases Power


  • Difficult To Install

Best Uses

  • Everyday Driving
  • Performance Driving
  • Replacement

Comments about Autolite Double Platinum Spark Plugs:

Changing spark plugs on a sideways V-6 is a daunting task. So, while my upper intake manifold was off I changed all the spark plugs. I think the OEM plugs were still in there! The electrodes were almost gone!

These plugs have performed just as well as the OEM did and I'm very happy with the installation and performance of the entire job.

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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:

    I need to order some spark plugs I need to get six but it does not say online if they are 1 in a pack or two in a pack can you help please.
    Asked on 12/15/2013 by Tony T from Spring hill

    1 answer



      Hi Tony, great question! I researched on our website and found that this double platinum spark plug is sold individually.

      Answered on 12/16/2013 by Vincent from AAP
  • Q:

    the spark plugs needs gap or not?
    Asked on 9/22/2012 by bacano from charlotte nc

    1 answer



      Yes, the Autolite Double Platinum Spark Plug (Part No. APP646) needs gap. Gap new plugs as recommended in your owner's manual or a Spark Plug Catalog. Use a feeler gauge to measure the gap between the center and ground electrode. The gauge should pass through snugly but easily. If it's too loose or too tight, reset the gap. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have.

      Answered on 9/22/2012 by John the Car-Doc from AAP
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