A Guide to Spark Plugs for the 2014-2024 Infiniti QX60
Understanding why replacing the spark plugs on your QX60 is more complex than on the average vehicle.
- Only use high-quality Iridium spark plugs from brands like NGK or Denso to match the 100,000+ mile OEM service life.
- Replacement on V6 models is very labor-intensive because the intake manifold must be removed to access the three rear plugs.
- Always replace the intake manifold gaskets when changing the spark plugs to prevent future vacuum leaks.
- On higher mileage vehicles, replace the ignition coils at the same time as the plugs to save on significant future labor costs.
Signs of Failing Spark Plugs
When your QX60's spark plugs are worn, your vehicle will give you clear signs. Ignoring these symptoms can lead to worse fuel economy, poor performance, and potentially damage to other expensive parts like the catalytic converter.
- Rough Idle: The engine may vibrate or sound uneven when you are stopped.
- Engine Misfires: You might feel a hesitation, stumble, or jerking feeling during acceleration. This will often cause the 'Check Engine' light to turn on or even flash.
- Reduced Fuel Economy: Worn plugs burn fuel less efficiently, meaning more trips to the gas station.
- Poor Acceleration: Your QX60 may feel sluggish and less responsive than it used to.
- Difficulty Starting: A weak spark can make it harder for the engine to turn over, especially in cold weather.
Choosing the Right Aftermarket Spark Plug
For the Infiniti QX60, the original factory plugs are long-life Iridium types designed to last over 100,000 miles. When choosing an aftermarket replacement, it is critical to stick with this same Iridium technology. Using cheaper copper or platinum plugs is not recommended, as they will wear out much faster and require you to perform the difficult replacement job all over again sooner.
Brand Quality Tiers
| Tier | Brands | Assessment |
|---|---|---|
| Top Tier (OEM Equivalent) | NGK, Denso | NGK and Denso are often the original equipment manufacturers for Infiniti. Their Laser Iridium and Iridium Long-Life plugs are designed to match the performance and 100,000+ mile lifespan of the factory parts. These are the most recommended choices for the QX60. |
| Quality Alternative | Bosch | Bosch is a reputable German brand that makes high-quality Double Iridium spark plugs. While some mechanics prefer NGK for Japanese vehicles, Bosch offers a durable and reliable alternative that meets the demands of the QX60's engine. |
| Standard / Economy | Champion | Champion provides functional spark plugs that will work, but they may not offer the same longevity or refined performance as the top-tier Iridium options. Given the high labor cost of replacement, investing in a longer-lasting plug is usually more cost-effective. |
A Note on QX60 Engine Variations
The 2014-2024 QX60 came with different engines. Most models have a 3.5L V6. From 2014-2017, a 2.5L 4-cylinder Hybrid was also available. Starting in 2022, the QX60 switched to a new 3.0L twin-turbo V6. These engines use different spark plugs. Always confirm the correct part number for your specific year and engine before ordering.
The Difficult Replacement Job on the V6 Engine
Replacing spark plugs on the 3.5L V6 engine in the 2014-2020 QX60 is a complex job. While the front three plugs (Bank 2) are easy to access, the rear three plugs (Bank 1) are buried underneath the upper intake manifold. To reach them, a mechanic must remove the entire manifold, which is a time-consuming process. This is why shop labor costs are so high for this service.
Pro Tip: Replace Gaskets and Coils at the Same Time
Because the intake manifold must be removed, it is essential to replace the intake manifold gaskets at the same time to prevent future air leaks. Furthermore, if your QX60 has over 60,000 miles, it is highly recommended to replace the ignition coils along with the spark plugs. Worn plugs strain the coils, and since the labor to access the rear bank is already being done, replacing them all at once can save you from a very expensive repair in the future.
Frequently Asked Questions
How often do I need to change the spark plugs on my QX60?
Infiniti's official maintenance schedule for the original Iridium plugs is every 105,000 miles or 126 months, whichever comes first. If you use high-quality aftermarket Iridium plugs, you can expect a similar lifespan.
Why is the replacement so expensive at a repair shop?
The high cost is almost entirely due to labor. On the V6 models, a mechanic must spend several hours removing the upper intake manifold just to access the three rear spark plugs. The parts themselves are not overly expensive, but the job is labor-intensive.
Can I use cheaper platinum or copper plugs instead of Iridium?
You can, but it is strongly advised against it. Cheaper plugs have a much shorter service life. This means you will have to repeat this very difficult and expensive replacement job much sooner, costing you more in the long run.
Do I need to 'gap' the new spark plugs?
No. Modern Iridium spark plugs come pre-gapped from the factory for your specific engine. You should not attempt to adjust the gap yourself, as the fine Iridium tip is extremely fragile and can be easily broken. Simply inspect the new plug to ensure it wasn't damaged during shipping.
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Technical Specifications
OEM Part Numbers: 22401-EW61C (3.5L V6, VQ35DE/VQ35DD) 22401-1KC1C (2.5L Hybrid, QR25DER) 22401-5NA1C (For newer models, likely 3.0T V6)
The recommended spark plug type for all 2014-2024 Infiniti QX60 engines is Iridium. For the common 3.5L V6, a 14mm spark plug socket is required for removal and installation. The plugs come pre-gapped and should not be adjusted.
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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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