A Guide to Spark Plugs for the 2015-2023 Dodge Challenger
Keep your Challenger's V6 or HEMI V8 engine running strong with the right set of new spark plugs.
- Challenger models with a HEMI V8 engine (5.7L, 6.2L, 6.4L) require 16 spark plugs, not 8.
- Replacement intervals vary from 30,000 to 100,000 miles; check your owner's manual for your specific engine.
- NGK and Denso are top-rated aftermarket brands trusted by Challenger owners for performance and longevity.
- A factory notice (CSN A6B) was issued for some 2023 6.2L HO models to correct an improper spark plug gap.
Is it Time for New Spark Plugs?
Worn-out spark plugs can make your powerful Challenger feel sluggish and unwell. Because they wear down gradually, you might not notice the slow decline in performance. If you experience any of the symptoms below, it's a good sign that your plugs are due for a change. Ignoring these 🎬 Watch: A quick guide to common symptoms of bad spark plugs. signs can lead to more expensive problems, like a damaged catalytic converter.
Choosing the Right Aftermarket Spark Plugs
When shopping for spark plugs for your Challenger, you'll find several brands and types. While Mopar is the factory brand, they often use high-quality manufacturers like NGK or Champion to produce their plugs. This means you can often get OEM-quality or better from an aftermarket brand.
Brand Quality Tiers
- Top Tier (OEM-Equivalent or Better): Brands like NGK and Denso are consistently praised by Challenger owners for their reliability and performance. Their iridium and ruthenium plugs offer excellent longevity and a stable spark, making them a top choice for all Challenger engines, from the V6 to the supercharged Hellcat.
- Mid-Tier (Reliable & Recommended): Champion is a trusted brand and is often the original equipment in many HEMI engines. They offer a great balance of performance and value. Bosch is another strong contender, providing quality double iridium and platinum plugs that are a solid choice for daily driving and light performance use.
- Economy Tier (Budget-Friendly): Brands like Autolite and Crown Automotive provide a functional, low-cost alternative. While they will get the job done, they may not offer the same performance or long lifespan as the top-tier iridium plugs.
Pro Tip: The HEMI Needs 16 Plugs
If you have a V8 Challenger (R/T, Scat Pack, Hellcat), remember that you need to purchase 16 spark plugs to complete the job. This is a common point of confusion. Always confirm the quantity before you buy.
🎬 See this step-by-step walkthrough for changing all 16 HEMI plugs.Known Issues and Bulletins
In January 2025, FCA issued a Customer Satisfaction Notification (CSN A6B) for certain 2023 Dodge Challenger models equipped with the 6.2L High-Output engine, such as the Demon 170. The notification addressed an issue where the spark plug gap may have been set too high from the factory, potentially causing reduced power, engine misfires, and illuminating the check engine light. The remedy was a free-of-charge replacement of all spark plugs by a dealer. No other widespread recalls for spark plugs apply to the 2015-2023 model years.
Aftermarket Spark Plug Cost
| Engine | Plug Type | Cost Per Plug (Approx.) | Total Parts Cost (Approx.) |
|---|---|---|---|
| 3.6L V6 (6 Plugs) | Iridium/Platinum | $8 - $25 | $48 - $150 |
| 5.7L HEMI V8 (16 Plugs) | Copper/Iridium | $4 - $20 | $64 - $320 |
| 6.2L / 6.4L HEMI V8 (16 Plugs) | Iridium/Platinum | $10 - $44 | $160 - $704 |
Frequently Asked Questions
How often should I change my Challenger's spark plugs?
It depends on your engine and the type of plugs installed. Some older HEMI models with copper plugs required a 30,000-mile interval. However, most 2015-2023 Challengers with factory iridium plugs have a much longer replacement interval of up to 100,000 miles. Always consult your owner's manual for the specific recommendation for your vehicle.
Do I need special plugs for my Scat Pack or Hellcat?
Yes, high-performance models require specific spark plugs that can handle the higher cylinder pressures and temperatures. Using the wrong heat range can lead to engine damage. Stick with high-quality iridium plugs from brands like NGK or Denso that are specified for your exact model (6.4L or 6.2L Supercharged). For modified engines with forced induction or nitrous, OEM plugs are still often recommended unless your tuner specifies otherwise.
Should I check the gap on new spark plugs?
Yes. While most modern plugs come "pre-gapped," it's always a good idea to verify the gap with a feeler gauge before installation. Shipping and handling can sometimes alter the gap. Using the correct gap specified for your engine is crucial for performance.
Should I use anti-seize on the threads?
It depends on the spark plug manufacturer. Many modern NGK and Denso plugs have a special trivalent plating that acts as its own anti-seize and corrosion inhibitor. Applying additional anti-seize to these plugs can cause you to over-torque them, potentially damaging the threads in the cylinder head. Always check the plug manufacturer's instructions.
Helpful Videos
Technical Specifications
OEM Part Numbers: SP143877AB
Spark plug material varies by engine and trim, including copper, platinum, and iridium. HEMI V8 engines use two plugs per cylinder. The standard gap for the 5.7L HEMI is often around 0.044 inches. Always verify the correct part number and gap for your specific engine.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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