We researched and compared the top spark plugs for the Nissan 370Z using manufacturer specifications, published industry standards, and aggregated owner feedback. Our evaluation focuses on performance, durability, and fitment for the VQ37VHR engine. Whether you need a daily driver plug or a high-performance upgrade, this guide breaks down the real strengths and limitations of each option.
| Photo | Product | Score | Buy |
|---|---|---|---|
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NGK 94460 Laser Iridium Best Overall OE replacement, iridium tip, 0.044 in. gap |
9.0 | 🛒 Check Price |
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Denso 4711 Iridium TT Best Value Twin-tip iridium, 0.044 in. gap |
8.7 | 🛒 Check Price |
 |
NGK 91701 LFR6AHX-S Iridium IX Best for Tuned Engines Colder heat range (6), iridium tip, 0.044 in. gap |
8.4 | 🛒 Check Price |
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NGK 6546 G-Power Platinum Budget Pick Platinum tip, 0.044 in. gap, copper core |
7.8 | 🛒 Check Price |
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Denso 5303 Iridium Power Performance Upgrade 0.4mm iridium tip, 0.044 in. gap |
8.1 | 🛒 Check Price |
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ACDelco 41-103 Iridium OEM Alternative Iridium tip, 0.044 in. gap, OEM for some GM |
7.3 | 🛒 Check Price |
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E3 Spark Plugs E3.70 Unique Design DiamondFire electrode, 0.044 in. gap |
7.6 | 🛒 Check Price |
1. NGK 94460 Laser Iridium: Best Overall
In our evaluation, the NGK 94460 Laser Iridium stands out as the direct OE replacement for the 370Z. Based on the spec sheets, it matches the factory heat range and gap, ensuring consistent ignition and minimal misfire risk. Owner feedback consistently highlights improved cold starts and smooth idle compared to older plugs. This plug is ideal for stock or lightly tuned 370Zs that prioritize reliability and longevity.
However, for those running forced induction or aggressive tunes, the NGK 94460 may not deliver the same performance as a colder heat range plug. If you have extensive engine modifications, consider a step colder option. Overall, it is a solid choice for daily drivers and enthusiasts who want a worry-free plug change.
- OEM specification for 370Z, exact fit
- Iridium center electrode for long life
- Pre-gapped to factory spec, install ready
Pros: OEM quality and reliability; Excellent throttle response and idle smoothness
Cons: Not the best for heavily modified engines
2. Denso 4711 Iridium TT: Best Value
We compared the Denso 4711 Iridium TT against other premium options and found it offers a strong value proposition. The twin-tip design is intended to provide a more reliable spark, which can translate to better combustion efficiency. Based on owner feedback, many 370Z drivers report a noticeable improvement in throttle response and fuel economy after installation. The iridium center and platinum ground promise decent longevity.
However, some users noted that the plugs were not pre-gapped to the exact 0.044 inch specification, so you may need to check and adjust the gap before installation. This adds a small step to the process. If you are comfortable with basic tuning, this is a great mid-range choice. But if you prefer a plug that is truly ready to install, the NGK 94460 is more consistent.
- Twin-tip design for improved spark propagation
- Iridium center and platinum ground
- Competitive pricing for premium iridium
Pros: Better fuel economy than standard plugs; Good balance of performance and cost
Cons: May require re-gapping out of the box
3. NGK 91701 LFR6AHX-S Iridium IX: Best for Tuned Engines
For 370Z owners with superchargers, turbos, or aggressive tunes, we recommend considering the NGK 91701 Iridium IX. This plug uses a colder heat range (6 vs OEM’s 5) to help dissipate heat and prevent detonation. Based on spec sheets and feedback from the tuning community, it is a common upgrade for modified VQ37VHR engines. The fine iridium tip provides reliable ignition even under high boost.
However, this plug is not ideal for stock or mostly stock 370Zs. In normal driving, the colder heat range can cause carbon fouling and misfires, especially during short trips. It also tends to wear faster than the standard heat range plugs. If your engine is stock, stick with the OEM heat range. This plug is strictly for those who push their car hard.
- One step colder than OEM (heat range 6)
- Suitable for forced induction and high compression
- Fine iridium tip for precise spark
Pros: Reduces pre-ignition risk in modified engines; Good high-RPM performance
Cons: May cause fouling in stock engines if driven gently; Shorter lifespan than standard heat range
4. NGK 6546 G-Power Platinum: Budget Pick
In our evaluation, the NGK 6546 G-Power Platinum is a budget-friendly option that still meets the basic requirements for a 370Z. It features a platinum center electrode and a copper core, which helps with heat dissipation. Owner feedback indicates it works fine for daily commutes and stock engines, providing smooth idle and acceptable throttle response. If you are on a tight budget, this plug can get the job done without major issues.
However, the platinum tip does not last as long as iridium, so you will need to replace them more frequently (typically around 30,000 miles vs 60,000+ for iridium). Also, if you plan to track your car or add performance mods, this plug will not hold up under extreme conditions. It is best reserved for stock, low-stress driving.
- Affordable platinum plug for daily driving
- Copper core for heat transfer
- Pre-gapped to factory spec
Pros: Very low cost per plug; Reliable for stock engines
Cons: Shorter lifespan than iridium plugs; Not suitable for high-performance use
5. Denso 5303 Iridium Power: Performance Upgrade
The Denso 5303 Iridium Power is marketed as a performance upgrade, and based on the spec sheet, its 0.4mm iridium tip is designed to produce a stronger spark. In our comparison, we found that it performs well in 370Zs with bolt-on modifications like intakes and exhausts. Owner feedback often mentions a crisper throttle response and a slight improvement in mid-range power. It is a step up from standard iridium plugs for those seeking a bit more edge.
However, the fine tip is more prone to wear if the engine is not properly tuned or if there is any detonation. Some users reported the need to replace them sooner than expected (around 40,000 miles). Additionally, the price is higher than other iridium options without a clear longevity benefit. If you have a mostly stock car, the extra cost may not be justified.
- Ultra-fine 0.4mm iridium electrode
- Designed for improved ignitability
- Suitable for mild bolt-on modifications
Pros: Sharp throttle response; Good for mild tunes (intake/exhaust)
Cons: More expensive than standard iridium; May not last as long as OEM spec
6. ACDelco 41-103 Iridium: OEM Alternative
We included the ACDelco 41-103 as an alternative for those who prefer a different brand. It is an iridium plug that cross-references to the same heat range and gap as the OEM NGK. Based on the spec sheet, it should work in the 370Z, and some owners report satisfactory results. It is often cheaper than the NGK or Denso equivalents, making it a tempting budget iridium option.
However, we found that owner feedback is mixed. Some users experienced misfires or rough idle, possibly due to slight differences in electrode design or manufacturing tolerances. It is not a direct OEM part for Nissan, so fitment may not be as precise. We recommend this only if you are willing to test and possibly replace them. For guaranteed performance, stick with the NGK or Denso options.
- Iridium construction for longevity
- Cross-references to NGK/Denso
- Budget-friendly iridium option
Pros: Lower price than NGK/Denso iridium; Decent quality for the cost
Cons: Not specifically designed for 370Z; Mixed owner feedback on fitment
7. E3 Spark Plugs E3.70: Unique Design
The E3 Spark Plugs E3.70 features a unique DiamondFire electrode that is claimed to provide a larger spark path. In our research, we found that some 370Z owners have tried these and reported a smoother idle and slightly better fuel economy. The plug is pre-gapped to 0.044 inches and fits the VQ37VHR engine. It is an interesting alternative for those who want to experiment with different spark plug technologies.
However, long-term durability data is limited, and we have seen mixed reviews about lifespan. Some users experienced misfires after a few thousand miles, possibly due to electrode wear. Additionally, the unique design may not be compatible with high-performance modifications. If you have a stock 370Z and are curious, it might be worth a try, but for reliability, stick with the more established brands.
- Patented DiamondFire electrode shape
- Claims improved combustion efficiency
- Pre-gapped for 370Z
Pros: Unique design may reduce misfires; Some owners report smoother idle
Cons: Unproven long-term durability; Not recommended for modified engines
Frequently Asked Questions
What is the best spark plug for a stock 370Z?
For a stock 370Z, we recommend the NGK 94460 Laser Iridium. It is the OEM plug and offers the best balance of performance, durability, and fitment. Based on owner feedback and spec sheets, it provides reliable cold starts and smooth idle.
How often should I change spark plugs on a 370Z?
Nissan recommends replacing spark plugs every 60,000 to 100,000 miles for iridium plugs. However, if you drive hard or have modifications, you may need to change them sooner. Check your owner’s manual and inspect plugs for wear or fouling.
Can I use a colder heat range plug in my 370Z?
Yes, but only if you have forced induction or a heavily modified engine. A colder plug (like NGK 91701) helps prevent pre-ignition. For stock engines, it can cause fouling and poor performance. Always consult a tuner before changing heat range.
Are double platinum or iridium plugs better for the 370Z?
Iridium plugs generally offer longer life and better performance than platinum. Double platinum plugs are good for waste spark systems but the 370Z uses coil-on-plug, so iridium is the preferred choice. We recommend iridium for best results.
Do I need to gap spark plugs for my 370Z?
Most new plugs come pre-gapped, but we recommend checking the gap with a tool. The correct gap for the 370Z is 0.044 inches (1.1 mm). Adjust if necessary to ensure proper ignition and avoid misfires.
Our Verdict
After our research and comparison, the NGK 94460 Laser Iridium is our top pick for most 370Z owners due to its OEM fitment and reliable performance. For those on a budget or with mild modifications, the Denso 4711 Iridium TT offers excellent value. Choose based on your driving needs and modification level.
