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Advance Auto Parts Logo
1205 E Main St
Columbus, OH 43205
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Autolite Iridium Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition

Part # XP985
limited lifetime replacement
$9.99
Add A Vehicle to Check Fitment
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Store Pickup

FREE
Ready in 30 mins at 1205 E Main StColumbus, OH

Same Day Home Delivery

$8.99

Not Available in:
43205

Home Delivery

FREE for orders over $35

Standard Delivery Available

Curbside pickup is available at most stores
$3 Rebate with the purchase of 4 or more Autolite Iridium Ultra or Iridium XP Spark Plugs (purchases must be on same transaction)

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Product Information

Product Details
Part No. XP985
Warranty Details (LIMITED LIFETIME REPLACEMENT)
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 0.6mm 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.

Product Features:
  • 0.6 mm finewire design improves ignitability
  • Patented V-trimmed platinum sidewire technology resists wear
  • OE equivalent design is engineered for every engine
  • Designed for better overall durability with virtually no gap erosion
  • Double Iridium-Enhanced Alloy Technology Center Electrode: Offers improved durability and wear resistance.
  • Designed and Engineered in the USA: Reflects over 100 years of Autolite's engineering experience.
  • Gasket Seat Type: Ensures a secure and reliable fit for optimal performance.
Specifications
Center Electrode Core Material:
Platinum

Center Electrode Tip Material:
Iridium

Electrical Terminal Type:
Stud

Ground Electrode Core Material:
Nickel

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
Tapered

Ground Electrode Tip Material:
Platinum

Hex Size:
5/8" in

Pre-Gap Size:
0.034 in

Reach:
19 mm

Resistance:
4000

Resistor Type:
Yes

Seat Type:
Flat

Thread Diameter:
14 mm

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4.64 out of 5
1586 Customer Reviews
81% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
1304
4 Stars
154
3 Stars
39
2 Stars
14
1 Star
75
I would not buy againGreat qualityLasted less than 1 year
Will buy this agianyeS5 stars if you get the right part deliveredGreat buy ! Better than NGK... lifetime warrantyI never buy again  electric parts.
Pros
50
Improves Engine Efficiency
49
Easy To Install
43
Increases Power
27
Durable
11
Lightweight
Cons
8
No Improvement In Performance
5
Decreases Gas Mileage
4
none
3
Difficult To Install
1
Not Oem
Best Uses
53
Everyday Driving
44
Replacement
21
Performance Driving
5
Racing
1
Restoration
Car & Truck
10
Casual Driver
6
Truck Enthusiast
5
Auto Enthusiast
4
Mechanic
1
Competitive Driver
Describe Yourself
26
Auto Enthusiast
26
Casual Driver
16
Mechanic
14
Truck Enthusiast
1
Competitive Driver
Most Liked Positive Review
Good Plug - Great Price
I bought this plug mainly becuase I wanted an Iridium plug that would have the durability, and reliability to match that of the OEM plugs. I spent a lot of time researching various plugs, but when it comes down to it; for a daily driver just about any plug will be fine. What I did like was that between the online savings code with Advance Auto and the mail-in rebate from Autolite, I was able to purchase these for less than $3 a plug. I put the plugs into both a 2002 Lincoln Navigator with the 5.4L and a 2002 Ford Mustang GT with the 4.6L. After a month of driving, both run very smoothly and are performing as expected. These are a good plug at a good price.
Most Liked Negative Review
Not Pleased
I just installed the Autolite Xtreme Iridium plugs and the 19 yr old nissan 3.0 v6 motor developed a rough idle and drop in performance. So yesterday I reinstalled the old plugs and the engine runs quite abit smoother. Oh well..
Reviewed by 1586 Customers
Would definitely buy again
Submitted 23 days ago
Great quality and got my job done.
Bottom Line Yes, I would recommend to a friend
Spark plugs
Submitted a month ago
These spark plugs are a perfect fit for my car, customer service at the N. Broadway location were awesome, thanks guys!!!
Bottom Line Yes, I would recommend to a friend
i would buy this product again and again
Submitted a month ago
Its excellent
Bottom Line Yes, I would recommend to a friend
I loved these spark plugs, perfect and dependable
Submitted a month ago
Best spark plugs ever…
Bottom Line Yes, I would recommend to a friend
Only lasted 42k miles...
Submitted 4 months ago
These are okay.... 4 years later I had a cylinder 3 misfire on my 2012 Honda pilot. Ran only 42k miles expecting to hit at least 60k + with these. My OEM spark plugs (I believe NGK) were only changed after 98k miles....after factory with Zero Misfires. I just changed these recently to NGK spark plug and expecting better than these autolite ones.
Bottom Line No, I would not recommend to a friend
Displaying Reviews 1 - 5Back to Top

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Are these plugs pre gaped?
Verified Reply - Solomon
Hi Thomas, happy to help you! This Autolite Iridium Iridium XP Spark Plug (Part # XP3924) has a pre-gap size of .045"-inch. All the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings.
Are these considered short plugs and what's the length?
Verified Reply - Steve
No, David, this Autolite Iridium Iridium XP Spark Plug (Part # XP3924) is not a short spark plug, it has a thread reach of 0.75"- inches.
How do I get the rebate in the mail? What do I have to do?
Verified Reply - Solomon
Hi Jason, happy to help you! All rebate inquiries are handled by a different department and we do not have access to the rebate information. I suggest you to contact the rebate customer service at 1-888-378-9766 or through email at advanceautoparts@help.4myrebate.com and they would be in a better position to assist you further.
Does this spark plugs ready to install as is
Verified Reply - Steve
Hi Maynard, I'm glad to help you! This Autolite Iridium Iridium XP Spark Plug (Part # XP5224) is ready to install. However, when it comes to repair and maintenance it is always recommended referring the vehicle owner's manual for the exact specifications to get better and safer results.
Hi I just bought XP 5702 Spark plugs and I would like to know if have to gap it to fit my Hyundai 2016 sonata or there is no need to do so… thanks
Verified Reply - Steve
Hi John, I'm glad to help you! This Autolite Iridium Iridium XP Spark Plug (Part # XP5702) is an exact fit for your 2016 Hyundai Sonata. All the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for.
Displaying Question & Answer 1-5

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