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.
OE equivalent design is engineered for every engine
Designed for better overall durability with virtually no gap erosion
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:
0.05 in
Reach:
25 mm
Resistance:
4000
Resistor Type:
Yes
Seat Type:
Tapered
Thread Diameter:
14 mm
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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
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
Replace Factory Oem
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..
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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.
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