A Guide to Replacing Spark Plugs on Your 2018-2025 Dodge Durango
Keep your Durango's engine running strong by understanding when and how to replace your spark plugs.
- HEMI V8 engines (5.7L, 6.4L, 6.2L) require 16 spark plugs, while the 3.6L V6 requires 6.
- High-quality aftermarket brands like NGK and Champion are often the OEM suppliers and offer the same quality as Mopar-branded plugs for less cost.
- Replacement on the 3.6L V6 is significantly more difficult than on the V8s because the intake manifold must be removed.
- Check for TSB 09-013-20 REV. A if you have a 2020 3.6L V6 with a misfire code, as you may have faulty original plugs.
Symptoms of Failing Spark Plugs
Worn-out spark plugs can cause noticeable problems. If you experience any of these issues, it might be time for a replacement.
- Rough Idle: The engine may shake or vibrate more than usual when you're stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. This can also trigger a flashing check engine light.
- Reduced Fuel Economy: If you're filling up your tank more often, failing spark plugs could be the cause, as the engine isn't burning fuel efficiently.
- Difficulty Starting: Worn plugs can make it harder for the engine to turn over, especially in cold weather.
- Check Engine Light: A misfire will often log a diagnostic trouble code (DTC), such as P0300 (random misfire) or P0301-P0308 (for specific cylinders), illuminating the check engine light. 🎬 Watch this video to diagnose a cylinder misfire and check engine light.
Choosing the Right Aftermarket Spark Plugs
When shopping for new spark plugs, you'll find several types and brands. For the 2018-2025 Durango, sticking close to the original equipment (OEM) specifications is highly recommended for best performance.
OEM vs. Aftermarket Quality
Mopar is the OEM parts brand for Dodge. However, Mopar doesn't manufacture spark plugs; they are typically made by brands like NGK or Champion and re-labeled. This means you can often buy the exact same quality plug under the NGK or Champion name for less money. For modern, computer-controlled engines like those in the Durango, using a high-quality aftermarket plug from a reputable OEM supplier is a safe bet. Cheaper, lesser-known brands can sometimes cause issues like rough idling or misfires, even when new.
Brand Tiers for Dodge Durango
- Tier 1 (OEM & Premium Aftermarket): NGK and Champion are the most common original equipment suppliers. Denso is another high-quality Japanese brand known for its reliability. These brands are widely recommended by mechanics and owners for their performance and durability. Iridium-tip plugs, like the NGK Laser Iridium or Iridium IX, are a popular upgrade and often the OEM material, offering a long service life and consistent performance.
- Tier 2 (Reputable Aftermarket): Bosch and Autolite offer reliable platinum and iridium plugs that meet or exceed OEM specs. They are a solid choice if the Tier 1 brands are not available.
- Tier 3 (Economy): Store brands and lesser-known brands like Skyward or Crown Automotive may be available at a lower price point. While they may function, they might not offer the same longevity or precise performance as the OEM-equivalent plugs, potentially leading to issues sooner.
Pro Tip: The 5.7L, 6.2L, and 6.4L HEMI engines require 16 spark plugs (two per cylinder). The 3.6L V6 requires six. Always confirm your engine type before ordering to ensure you get the correct number of plugs.
Known Issues, Recalls, and TSBs
While there are no widespread recalls specifically for spark plugs on most 2018-2025 Durango models, some related issues have been noted.
- TSB 09-013-20 REV. A: This Technical Service Bulletin was issued for some 2020 models with the 3.6L Pentastar V6. It addresses potential internal cracks in the original spark plugs that could cause a misfire and illuminate the check engine light with codes P0301-P0306. The fix is to replace all six spark plugs.
- Customer Satisfaction Notification U65: This applied to some high-performance 6.2L engines and involved replacing all spark plugs due to an incorrect gap that could cause a reduction in power or misfires.
Always check for any open recalls or TSBs for your specific vehicle identification number (VIN).
| Part Type | Estimated Cost (Per Plug) | Notes |
|---|---|---|
| New OEM (Mopar) | $15 - $46 | Highest cost, identical to top-tier aftermarket. |
| New Aftermarket | $4 - $25 | Price varies by brand and material (Iridium is most expensive). |
| Shop Labor | $200 - $500+ | Varies by engine. The 3.6L V6 requires removing the intake manifold, increasing labor time. | 🎬 See this walkthrough for replacing spark plugs on the 3.6L V6 engine.
Frequently Asked Questions (FAQ)
How often should I change the spark plugs on my Dodge Durango?
For most 2018-2025 Durango models with iridium spark plugs, the recommended replacement interval is around 100,000 miles. However, some service schedules for the 5.7L HEMI engine suggest a much shorter interval of 32,000 miles. Always consult your owner's manual for the specific interval for your engine. Many owners choose to replace them sooner as preventative maintenance.
How many spark plugs does my Durango have?
If you have the 3.6L V6 engine, you need six spark plugs. If you have a 5.7L, 6.4L, or 6.2L HEMI V8 engine, you need sixteen spark plugs (two for each of the eight cylinders).
What is the correct spark plug gap for a Dodge Durango?
The correct gap varies by engine and plug type, but it is typically between 0.040" and 0.044". Most high-quality iridium and platinum plugs come pre-gapped from the factory. It is crucial not to attempt to gap fine-wire iridium plugs with a standard gapping tool, as you can easily break the delicate electrode. Always verify the part number is correct for your vehicle, and if the pre-set gap is correct, install them as-is.
Is replacing the spark plugs a DIY job?
It depends on your engine. For the HEMI V8 engines, the job is relatively straightforward, as the ignition coils and plugs are easily accessible on top of the engine. For the 3.6L V6 engine, the job is much more involved because the upper intake manifold must be removed to access the spark plugs on one side of the engine. This increases the difficulty and risk for a novice mechanic.
🎬 Watch a step-by-step guide on how to replace Durango spark plugs.Helpful Videos
Technical Specifications
OEM Part Numbers: SP149125AD SP149212AC SPLZFR5C11 SP143877AB
Material: Iridium or Platinum are OEM standard. Gap: Varies by engine, typically 0.040"-0.044". Most quality plugs are pre-gapped. Quantity: 6 for V6, 16 for V8s.
We Have This Part in Stock
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.
- Dodge Durango: