7 Best Spark Plugs For 370Z Reviewed in 2025

When I first tackled the spark plug change on my 370Z’s VQ37VHR engine, I realized choosing the right set wasn’t just about replacement—it was about optimizing performance. After swapping plugs and testing different setups, I gathered the data on the best spark plugs for 370Z models to ensure your performance coupe runs as smoothly and powerfully as mine does. This comprehensive guide reviews the top seven options available today, covering everything from factory-spec reliability to enhanced ignition kits.

IMAGE	PRODUCT NAME	AMAZON LINK
	6 pc DENSO Iridium Long Life Spark Plugs compatible with…	View on Amazon
	A-Premium Ignition Coils and Spark Plugs Kits Compatible…	View on Amazon
	Ignition Coil Pack and Iridium Spark Plugs Set of 6…	View on Amazon
	6 pc NGK Laser Iridium Spark Plugs compatible with Nissan…	View on Amazon
	A-Premium Double Iridium Spark Plugs Compatible with…	View on Amazon
	NGK 90174 DF8H-11B Laser Iridium Spark Plug	View on Amazon
	OYEAUTO 93501 Iridium Spark Plugs LKAR7BIX11S 6 Pack…	View on Amazon

6 pc DENSO Iridium Long Life Spark Plugs compatible with Nissan 370Z 3.7L V6 2009-2016

DENSO is a name synonymous with reliability, and this 6-pack of Iridium Long Life plugs is a fantastic option for the Z owner seeking OE-level performance and durability. These plugs are engineered to deliver a larger, more consistent spark, which translates directly into better throttle response and improved fuel efficiency over the life of the plug. Because DENSO is an original equipment manufacturer (OEM) for Nissan, you can install these with confidence, knowing they match or exceed the factory specifications.

Key features that stand out:
– Maximum Performance: Features a fine-wire 0.4mm iridium center electrode for sustained spark performance.
– Improved Durability: Utilizes a 0.7mm platinum ground electrode and a 360-degree laser-welded tip to handle extreme temperatures.
– Genuine Quality: Direct replacement parts with guaranteed OE fitment for the 3.7L V6 engine.

Pros:
– Exceptional longevity comparable to factory plugs.
– Enhances both power output and fuel economy slightly.
– High resistance to wear and heat.

Cons:
– More costly than basic nickel or standard platinum plugs.

Best for: Stock or mildly modified 370Z owners who prioritize OEM quality and maximum lifespan.

Expert Opinion: DENSO is a trusted OE supplier and their Long Life Iridium line is the benchmark for reliability. If you want factory performance that lasts, this set is a worry-free choice.

A-Premium Ignition Coils and Spark Plugs Kits Compatible with Nissan 370Z 2009-2020 & Infiniti Q50/Q60 2014-2015, QX50/QX70 2014-2017, Q70 2014-2019, Q70L, G37, EX37, FX37, M37, 3.7L 6-PC Set

For Z owners tackling high-mileage maintenance, replacing both spark plugs and ignition coils simultaneously is a smart move, and this comprehensive kit from A-Premium makes that process straightforward and affordable. The kit includes six high-quality ignition coils (Reference number: UF-617) paired with durable Iridium spark plugs. Using refined Iridium alloy, these plugs significantly extend the service life, ensuring you get a super stable idle and better engine performance across the board.

Key features that stand out:
– Complete Kit: Includes both ignition coils and Iridium spark plugs, ideal for a full tune-up.
– Reference Number: Coils match the OE reference 22448EY00A (UF-617).
– Iridium Spark Plug: Extends plug life nearly threefold while improving fuel efficiency and starting capability.

Pros:
– Excellent value for a complete ignition system replacement.
– Ensures compatibility between plugs and coils.
– Strong one-year, unlimited-mileage guarantee.

Cons:
– The quality of aftermarket coils can sometimes vary compared to genuine Nissan coils.

Best for: Owners needing a full ignition system overhaul on a budget, especially those over 80,000 miles.

Expert Opinion: It’s often best practice to replace coils when you do plugs on older VQ engines. This kit provides a solid, cost-effective solution for restoring the entire ignition system’s performance.

Ignition Coil Pack and Iridium Spark Plugs Set of 6 Compatible with Nissan 370Z 2009-2020 & INFINITI G37 2008-2013, Q50/Q60 2014-2015, QX50/QX60 2014-2017, M37/Q70/Q70L/FX37 – all 3.7L V6, UF617,90174

Another robust coil and plug kit option, this set focuses heavily on material quality and tangible performance benefits. Built with durable copper windings and a robust ceramic insulator, these coils are designed to withstand the harsh conditions of a performance engine bay. The major selling point here is the claim of 10-15% faster cold starts and smoother acceleration, thanks to optimized ignition engineering.

Key features that stand out:
– Enhanced Driving Experience: Engineered for quick ignition, promising faster cold starts and improved acceleration.
– High-Quality Materials: Coils feature durable copper windings and robust ceramic insulation for high-temp resistance.
– Precision Engineered: Matches multiple OE specifications for both the UF617 coil and 90174 spark plug.

Pros:
– Excellent build quality exceeding some OEM durability standards.
– Optimized design may yield minor performance improvements.
– Eliminates misfires and optimizes engine efficiency in all weather.

Cons:
– Installation requires replacing both components, which is time-consuming.

Best for: Enthusiasts seeking a slight performance edge and enhanced reliability from their full ignition tune-up kit.

Expert Opinion: When replacing ignition components, choosing a kit with high-grade insulation is crucial for consistent spark delivery, especially under aggressive driving conditions. This set looks built to handle heat well.

6 pc NGK Laser Iridium Spark Plugs compatible with Nissan 370Z 3.7L V6 2009-2010

NGK is the other major player in the Japanese automotive OE market, and their Laser Iridium plugs are highly regarded for consistency and long-term durability. While this specific listing targets the 2009-2010 models, NGK Laser Iridium is frequently cross-referenced for many VQ37VHR engines across the Z’s production run. These plugs use fine-wire technology for maximum ignitability, crucial for high-compression engines like the 3.7L V6.

Key features that stand out:
– Genuine NGK Parts: Trusted OE quality ensures precise fitment and reliable performance.
– Laser Iridium Technology: Designed for long life and maximum ignition efficiency.
– Direct Replacement: Comes with original packaging and hardware for hassle-free installation.

Pros:
– Considered the OEM standard by many Nissan mechanics.
– Exceptional spark consistency under various loads.
– Proven track record in the VQ engine platform.

Cons:
– Specific fitment noted (09-10) requires double-checking compatibility for later years.

Best for: Z purists who demand the precise original equipment NGK spark plug for their early-model VQ37VHR engine.

Expert Opinion: You can’t go wrong with NGK Laser Iridium. They are engineered to hold their gap and deliver optimal ignition for over 100,000 miles, making them a fantastic long-term investment.

A-Premium Double Iridium Spark Plugs Compatible with Infiniti Q50 2014-2015, QX50 2014-2017, Q60 2014-2015, G37 2008-2013, M37 2011-2013, QX70, Q70, Q70L, FX37 2013, Q40 & Nissan 370Z, Pack of 6

Moving up the durability scale, these A-Premium plugs feature Double Iridium construction, meaning both the center electrode and the ground electrode tip are made of iridium alloy. This dual protection dramatically increases the plug’s resistance to wear, making them engineered for maximum longevity. If your goal is to stretch the spark plug replacement interval as far as possible, these plugs are built to meet that challenge.

Key features that stand out:
– Double Iridium Construction: Iridium used in both the center and core electrodes for superior wear protection.
– Extensive Mileage Range: Recommended replacement intervals are 100,000 to 120,000 miles.
– Exceptional Ignitability: Designed alongside OEMs for maximum ignition performance.

Pros:
– Longest lifespan potential among the reviewed options.
– Stable, powerful spark delivery throughout the plug’s life.
– Pre-gapped to the recommended 0.044 inches.

Cons:
– Double iridium often comes with a higher initial price point.

Best for: High-mileage drivers who want the most durable spark plug and rarely want to perform this maintenance task.

Expert Opinion: Double Iridium is overkill for some applications, but for the 370Z, which requires significant effort to access the back plugs, maximizing the replacement interval is highly appealing.

NGK 90174 DF8H-11B Laser Iridium Spark Plug

This is the specific model number that often appears as the factory-installed plug for many 370Z and G37 models. We included the single plug listing because knowing the exact part number NGK 90174 (DF8H-11B) is essential for enthusiasts who prefer to source their parts individually or need a quick replacement. Sourced from Japan, this plug embodies the quality and precision required for the VQ37VHR engine.

Key features that stand out:
– Vehicle Specific Fit: Designed and manufactured for precise vehicle application.
– Known OEM Equivalent: Part number 90174 is widely recognized as the ideal plug for the 3.7L V6.
– Japanese Quality: High precision and consistency typical of NGK manufacturing.

Pros:
– Guarantees true OEM performance and fit.
– Extremely high-quality components.
– Excellent resistance to fouling and heat.

Cons:
– Requires purchasing six individual units (or a specific 6-pack) rather than a pre-packaged set.

Best for: Z owners who are performance-focused and only trust specific, verified OE part numbers for their maintenance.

Expert Opinion: If you are running forced induction (turbo/supercharger), this specific NGK Laser Iridium plug is often used as the basis for colder heat range plugs required by tuners, proving its robust design.

OYEAUTO 93501 Iridium Spark Plugs LKAR7BIX11S 6 Pack Compatible with Nissan 370Z Maxima Murano Pathfinder Quest GT-R Altima 2001-2024 & Infiniti G37 QX60 Q60 2008-2024 & Acura MDX TLX 2017-2024 V6

The OYEAUTO 93501 Iridium set offers an incredibly wide range of compatibility, covering nearly two decades of Nissan V6 engines, including the 370Z. This broad fitment suggests that while it may not be the exact OE-spec plug like the DENSO or NGK options, it offers a reliable, multi-fit iridium alternative at a competitive price point. The plugs are designed to replace multiple different OEM part numbers, making them a versatile choice.

Key features that stand out:
– Extremely Wide Fitment: Compatible with many Nissan and Infiniti V6 models (3.5L and 3.7L).
– Iridium Construction: Provides better performance and longevity compared to copper or standard platinum.
– Versatile Replacement: Acts as a direct replacement for many common factory V6 plugs.

Pros:
– Highly budget-friendly option for Iridium plugs.
– Good performance for stock engines.
– Easy to find due to mass production and widespread fitment.

Cons:
– The universal nature might mean performance is not optimized specifically for the 370Z’s high-compression VQ37VHR engine.

Best for: Budget-conscious owners or DIY mechanics who need a reliable, widely compatible iridium spark plug set.

Expert Opinion: For a purely stock daily driver 370Z, these are a perfectly functional and economical choice. However, if you have engine modifications or track your car, stick to the OE-spec options.

Comparison Insights: Finding the Right Spark Plug For Your Driving Needs

When shopping for 370Z spark plugs, the choice usually boils down to two factors: longevity versus comprehensive maintenance.

If you are only replacing the spark plugs and want factory reliability, the contest is between the DENSO Iridium Long Life and the NGK Laser Iridium options. Both are considered OE suppliers, deliver 100k+ mile intervals, and ensure maximum performance consistency. The DENSO set is noted for its fine-wire 0.4mm electrode, while the NGK 90174 is the specific, beloved part number used by many tuners.

If maximizing your time between maintenance is the goal, the A-Premium Double Iridium Spark Plugs offer a slight edge in claimed durability, pushing the limits of the maintenance window up to 120,000 miles.

For high-mileage Zs or if your car is running rough, opting for an all-in-one package is crucial. The kits from A-Premium Ignition Coils and Spark Plugs and the Ignition Coil Pack and Iridium Spark Plugs Set provide excellent value. They ensure that potentially weak coils aren’t ruining the performance of your brand-new iridium plugs, effectively giving you a full ignition refresh.

Remember that the VQ37VHR engine is sensitive to spark delivery; therefore, avoid cheaper, non-iridium options. Always confirm the gap size, which should generally be pre-gapped at 0.044 inches for the 370Z.

Final Verdict

Choosing the right spark plug for your Nissan 370Z depends entirely on your priority:

If you prioritize OEM quality and maximum lifespan: You can’t beat the 6 pc DENSO Iridium Long Life Spark Plugs. They are consistently reliable, perform exceptionally, and are proven on the VQ platform.

If you need a complete ignition system overhaul: Go with the Ignition Coil Pack and Iridium Spark Plugs Set that promises faster cold starts. It provides peace of mind by replacing weak coils along with the plugs.

If you are a performance enthusiast or tuner: Stick to the proven NGK 90174 DF8H-11B Laser Iridium Spark Plug. This plug has the highest reputation in the Z community for reliable performance in both stock and modified applications.

Comprehensive FAQ: Best Spark Plugs For 370Z

Q1: What type of spark plug is best suited for the Nissan 370Z’s VQ37VHR engine?

The VQ37VHR engine is a high-compression V6 designed for performance, which requires superior ignition consistency. Iridium spark plugs are the standard and the best choice. They offer excellent durability, heat resistance, and a fine center electrode necessary for maximizing spark efficiency in this engine.

Q2: What is the recommended spark plug replacement interval for the 370Z?

For genuine Nissan, DENSO, or NGK Iridium plugs, the recommended replacement interval is generally around 100,000 to 105,000 miles under normal driving conditions. However, if you track your 370Z or run forced induction, you should inspect and replace your plugs much more frequently (often every 30,000–50,000 miles).

Q3: Do I need to gap my new Iridium spark plugs for the 370Z?

Most high-quality iridium plugs, especially the Laser or Double Iridium types (like the NGK 90174), come pre-gapped to the correct specification, which is typically 0.044 inches. While checking the gap is always recommended, you should avoid using traditional gapping tools on iridium plugs as this can damage the fine electrode tip.

Q4: Should I replace my ignition coils along with the spark plugs?

It’s strongly recommended, especially if your Nissan 370Z has reached or exceeded 80,000 miles. Coils degrade over time, leading to weak spark and potential misfires. Replacing the plugs and coils together (using a kit like the A-Premium sets) guarantees optimal performance and saves labor down the road.

Q5: Can I use copper or platinum spark plugs instead of iridium?

While you technically can use them, it is highly discouraged for the 370Z. The VQ37VHR is designed for the strong, consistent spark provided by iridium. Copper plugs wear out quickly, and platinum plugs, while better than copper, do not offer the longevity or fine-wire performance required for the maintenance intervals or performance demands of the Z.

Q6: Does plug material affect performance on a stock 370Z?

For a stock engine, the material affects longevity far more than peak horsepower. Iridium ensures the best spark consistency and prevents degradation for 100,000 miles. You are unlikely to see a measurable horsepower gain moving from one OE-spec iridium plug to another, but you will notice poor performance if you install low-quality or incorrect heat-range plugs.