Best Spark Plugs For G35. 10 Best Spark Plugs For G35 Reviewed (2025)

When I first bought my G35, I knew the VQ35DE engine was special, but like any performance machine, it needs the right consumables to truly sing. A fresh set of quality Infiniti G35 spark plugs can completely transform throttle response and idle smoothness, especially if your car is feeling sluggish around the 60,000-mile mark. We’re deep-diving into the best options available today, focusing on what truly provides superior engine performance and longevity for your ride. This guide breaks down 10 of the top contenders, so you can confidently pick the right plug to keep your G roaring.

IMAGE	PRODUCT NAME	AMAZON LINK
	NGK 4469 Iridium IX Spark Plugs LFR5AIX11 (6 Pack)	View on Amazon
	6 pc NGK V-Power Spark Plugs compatible with Infiniti G35…	View on Amazon
	BDFHYK Set of 6 Iridium Spark Plug Compatible with…	View on Amazon
	UF401 Ignition Coil & 4469 Double Iridium Spark Plug 6PCS…	View on Amazon
	6 pc NGK Iridium IX Spark Plugs compatible with Infiniti…	View on Amazon
	Iridium Spark Plugs 6 Pack 4469 LFR5AIX11 Fits for 2002…	View on Amazon
	A-Premium 6PCS 4469 Iridium Platinum Spark Plugs Compatible…	View on Amazon
	1406 Double Iridium Spark Plug for Infiniti EX35 FX35 G25…	View on Amazon
	Set of 6 Ignition Coil Pack and Spark Plugs fits…	View on Amazon
	SYKRSS 4469 Iridium Spark Plugs 6 Pack Compatible with…	View on Amazon

NGK 4469 Iridium IX Spark Plugs LFR5AIX11 (6 Pack)

NGK Iridium IX plugs are often considered the gold standard replacement for the VQ35 engine, providing a significant upgrade over stock units. These plugs use a fine-wire iridium center electrode that delivers a potent, reliable spark, which translates directly to improved combustion efficiency. If you want maximum longevity combined with a noticeable gain in crisp throttle response, this set is a fantastic choice and provides a hassle-free, long-term solution for your Infiniti G35.

Key features that stand out (Bold):
– Iridium Construction: Fine-wire Iridium center electrode ensures excellent durability and consistent spark.
– Longevity: Engineered to last between 40,000 and 50,000 miles, providing extended service life.
– Optimized Performance: Precision laser electrode construction is designed for high-performance and turbo applications.

Pros:
– Industry-leading reliability and performance.
– Excellent cold-start performance.
– Direct OEM replacement fitment for easy installation.

Cons:
– Higher initial cost compared to copper or standard platinum plugs.

Best for:
Performance enthusiasts seeking reliable longevity and proven brand quality.

Expert Opinion: NGK Iridium IX plugs are frequently recommended by VQ engine tuners due to their stable ignition characteristics across the rev range. They maintain a consistent gap longer than standard plugs.

6 pc NGK V-Power Spark Plugs compatible with Infiniti G35 3.5L V6 2003-2007

If you’re looking for a reliable, economical option that still comes from a trusted OE supplier, the NGK V-Power line is an excellent choice. These are typically copper core plugs, which offer superior conductivity for a strong, hot spark. While they won’t last as long as their iridium counterparts, their performance in the short term is excellent, making them perfect if you prefer more frequent tune-ups. This specific 6-pack is tailored for the G35 V6 models from 2003-2007, ensuring plug-and-play fitment.

Key features that stand out (Bold):
– High Conductivity: Copper core provides a strong, reliable spark.
– Genuine NGK: Guaranteed genuine parts compatible with your G35 3.5L V6.
– Cost-Effective: An economical choice for maintaining strong ignition performance.

Pros:
– Strong spark and excellent conductivity.
– Affordable and trusted brand name.
– Direct replacement auto parts with easy fitment confirmation.

Cons:
– Copper plugs require replacement more frequently (typically every 30,000 miles).

Best for:
Budget-conscious owners who prioritize conductivity and don’t mind shorter replacement intervals.

Expert Opinion: The V-Power series is a classic choice for the G35. While iridium is the long-life king, V-Power provides arguably the most efficient spark delivery for the lowest price point, perfect for stock or lightly modified engines.

BDFHYK Set of 6 Iridium Spark Plug Compatible with INFINITI QX60 Q50 Q70 M35h JX35 EX35 FX35 G25 G35, Compatible with Nissan Maxima Murano Pathfinder Altima Quest 350Z, Replacement for 1406 DILKAR7B11

This set of six iridium spark plugs from BDFHYK is marketed as an OE-standard replacement, utilizing fine iridium electrodes for enhanced ignition. They promise to revitalize your G35’s performance, offering quicker and more sensitive ignition jumping compared to worn-out plugs. Constructed using TS16949 certified manufacturing standards, these plugs aim to match the durability and reliability required by the high-revving VQ engine. They are a suitable alternative for those seeking iridium performance without the premium NGK price tag.

Key features that stand out (Bold):
– OE Standard Durability: TS16949 certified manufacturing ensures reliability.
– Fine Iridium Electrode: Provides superior ignition performance and increased power.
– Insulator Quality: Made from high-density, high-strength isostatic ceramics for good insulation.

Pros:
– Highly cost-competitive iridium option.
– Engineered for sensitive ignition jumping and responsiveness.
– Guaranteed OE level durability and compatibility.

Cons:
– Brand name is less established than industry leaders like NGK.

Best for:
Owners looking for the longevity and performance of iridium at a lower replacement cost.

Expert Opinion: When considering off-brand replacements, checking the OE equivalent numbers (like 1406/DILKAR7B11) is crucial. This product claims direct interchangeability, making it a reliable choice for later model G35s (2007+ models often use slightly different plugs than 2003-2006).

UF401 Ignition Coil & 4469 Double Iridium Spark Plug 6PCS for Nissan Altima Maxima Pathfinder Quest 350Z Frontier Xterra NV1500 NV2500 NV3500/Infiniti FX35 I35 QX4 G35 M35 Replaces# 22448-AL61C

This is a comprehensive tune-up kit, perfect for the G35 owner who needs to address both old ignition coils and worn-out spark plugs simultaneously. This kit includes six Double Iridium spark plugs (OE #4469) and six UF401 ignition coils. Since faulty coils are a common cause of engine misfires and poor fuel economy in aging G35s, buying a matched set provides tremendous value and ensures superior performance right out of the box.

Key features that stand out (Bold):
– Complete Kit: Includes both 6 coils and 6 spark plugs (Double Iridium 4469).
– Double Iridium Plugs: Designed for an exceptionally long working life, potentially up to 100,000 kilometers.
– Enhanced Coil Construction: Coils feature internal ferrite noise suppressors and advanced thermoplastic connectors to resist heat fractures.

Pros:
– Ultimate value for a full VQ ignition system overhaul.
– Plugs offer extreme longevity (Double Iridium).
– Superior cold-start performance and smoother idle guaranteed.

Cons:
– While coils are high quality, they are aftermarket and might not match the fit/finish of OEM units precisely.

Best for:
G35 owners performing a major 100k+ mile tune-up requiring both plugs and coils.

Expert Opinion: Replacing the coils along with the spark plugs is highly recommended, especially on older VQ motors. This kit simplifies the process by providing matched, high-quality components designed to restore factory power and efficiency.

6 pc NGK Iridium IX Spark Plugs compatible with Infiniti G35 3.5L V6 2003-2007

This product is essentially the same high-performing Iridium IX plug (LFR5AIX11) as reviewed earlier, but specifically packaged and confirmed for the G35 3.5L V6 model years 2003 through 2007. NGK Iridium IX plugs feature an extremely fine center electrode, reducing the required voltage to jump the gap. This results in consistent and strong ignition, even under hard acceleration. Choosing a product specifically confirmed for your vehicle eliminates any guesswork regarding fitment or heat range.

Key features that stand out (Bold):
– Confirmed Fitment: Specifically listed and confirmed compatible with the 2003-2007 Infiniti G35 3.5L V6.
– Genuine NGK: Ensures you are receiving authentic, performance-tested parts.
– Enhanced Reliability: Delivers exceptional longevity and stable firing characteristics.

Pros:
– Trusted NGK performance designed for VQ engines.
– Reduces misfires and improves fuel efficiency.
– Comes with original packaging and hardware.

Cons:
– It’s strictly the plugs—no bundled coils or accessories.

Best for:
G35 owners prioritizing brand consistency and confirmed compatibility for the G35 VQ35DE engine.

Expert Opinion: If your coils are still healthy, sticking with this dedicated NGK Iridium set provides the best combination of quality materials and plug life for the G35.

Iridium Spark Plugs 6 Pack 4469 LFR5AIX11 Fits for 2002 2003 2004 2005 2006 Nissan Altima 3.5 Maxima Murano Pathfinder Frontier Quest Xterra & Infiniti G35 FX35 M35 I35 V6 3.5L Spark Plug

This six-pack of iridium spark plugs is based on the highly popular 4469/LFR5AIX11 reference number, indicating high compatibility with the 3.5L VQ engine family, including the Infiniti G35 V6 3.5L. These plugs boast a 0.6mm fine-wire iridium center tip combined with advanced laser welding technology. The benefit here is maximizing fuel efficiency while offering a material six times harder than platinum, meaning exceptional resilience to heat and electrical wear, essential for performance driving.

Key features that stand out (Bold):
– Material Durability: Iridium alloy is extremely hard, ideal for today’s high-performance engines.
– Fine-Wire Design: 0.6mm center tip maximizes fuel efficiency and ignition effectiveness.
– Broad Compatibility: Fits a huge range of VQ-equipped Nissan and Infiniti models, confirming the OE specification.

Pros:
– Excellent resistance to wear and tear.
– Designed to maintain peak fuel efficiency.
– High-quality laser-welded construction.

Cons:
– Packaging may be generic since it covers such a wide range of vehicles.

Best for:
Owners seeking a premium iridium plug that adheres exactly to the popular 4469 specification for durability and efficiency.

Expert Opinion: The specification LFR5AIX11 is practically synonymous with the VQ35DE. While not explicitly branded NGK, these plugs use the exact materials and reference points that assure reliable fitment and function in the G35.

A-Premium 6PCS 4469 Iridium Platinum Spark Plugs Compatible with Nissan Xterra, Altima, Maxima, Pathfinder & Infiniti G35 & Hyundai Santa Fe & Kia Barrego & Toyota 4Runner, 2.7L-4.0L, 2001-2021

A-Premium offers a blend of Iridium and Platinum materials in this spark plug set, aiming for the sweet spot between high-performance ignition and robust longevity. The design features an iridium center electrode and a platinum core, engineered to handle the demands of the G35’s VQ engine. With a recommended replacement interval of 80,000 to 100,000 miles, this set is a superb long-term investment, minimizing maintenance frequency.

Key features that stand out (Bold):
– Hybrid Construction: Iridium tip combined with a Platinum core for balanced performance and durability.
– Long Service Life: Recommended replacement interval of 80,000 to 100,000 miles.
– OE Specs: Includes precise specifications (Resistance: 5000 ohms, Gap Size: 0.044 inches) matching G35 requirements.

Pros:
– Exceptional mileage life, reducing maintenance downtime.
– Strong compatibility across various VQ generations (including VQ35DE).
– Excellent temperature stability due to robust material choices.

Cons:
– The mixture of metals can sometimes be less responsive than pure iridium in extreme tuning scenarios.

Best for:
G35 drivers who prioritize maximum mileage between services and reliable, long-term operation.

Expert Opinion: The use of both Iridium and Platinum metals ensures that the plug retains its integrity under high heat and pressure, making this a very practical, fit-it-and-forget-it option for standard driving.

1406 Double Iridium Spark Plug for Infiniti EX35 FX35 G25 G35 JX35 M35 M35h M56 Q50 Q70 QX60/Nissan Altima Maxima Murano Quest 350Z V6 Replaces # DILKAR7B11 (Set of 6)

Specifically designed as a replacement for the OE part number DILKAR7B11 (1406), this set features Double Iridium construction. Double Iridium plugs use iridium on both the center electrode and the ground electrode, significantly enhancing durability and extending the service life to potentially 100,000 kilometers. This design ensures that the spark remains stable and consistent over time, providing better cold-start performance and improved acceleration across the V6 engine’s power band.

Key features that stand out (Bold):
– Double Iridium: Iridium on both electrodes maximizes lifespan and stability.
– Enhanced Ignition: Provides exceptional ignitability for quicker starts and better acceleration.
– Fuel Economy: Stable spark leads to better fuel economy and lower emissions over time.

Pros:
– Extremely long working life (up to 100,000 km).
– Direct replacement for later-model OE plugs (DILKAR7B11).
– Highly stable and consistent ignition.

Cons:
– Best suited for 2007 and 2008 G35 models that utilize the DILKAR7B11 spec.

Best for:
Owners of newer G35 models (typically 2007 sedan) or those seeking the absolute longest lifespan available in a replacement plug.

Expert Opinion: Double Iridium is the pinnacle of spark plug durability. If your G35 uses the specified OE part number, this is a premium, maintenance-free choice for years of driving.

Set of 6 Ignition Coil Pack and Spark Plugs fits for Infiniti FX35 G35 M35 Nissan 350Z 2003 2004 2005 2006 2007 2008 3.5 V6 Replaces# UF401 4469

Similar to the UF401 kit, this LCWRGS set provides an integrated solution for coil and plug replacement on the VQ35DE engine. It bundles six high-performance coil packs (UF401) with six 4469 spark plugs, covering the critical components that often fail simultaneously on high-mileage G35s. The manufacturer claims this kit can deliver 15% more energy than original equipment, potentially solving issues like misfire, hesitation, and poor gas mileage in one comprehensive replacement.

Key features that stand out (Bold):
– Performance Upgrade: Claims 15% more energy output than OE coils.
– Comprehensive Replacement: Includes all 6 coils and 6 spark plugs (4469 spec).
– High-Quality Materials: Coils use highly conductive copper wire and high dielectric performance epoxy.

Pros:
– Excellent value for a full ignition tune-up.
– Designed to exceed OE specifications for better reliability.
– Covers the popular 2003-2007 G35 model years.

Cons:
– Performance claims might be optimistic compared to high-end branded coils.

Best for:
Owners doing a complete ignition system refresh on a budget, prioritizing efficiency over OEM branding.

Expert Opinion: The VQ engine bay, especially accessing the rear bank, makes plug and coil replacement difficult. Using a bundle like this ensures that if you’re doing the work once, you’re installing the newest possible components for both systems.

SYKRSS 4469 Iridium Spark Plugs 6 Pack Compatible with Altima 350Z Maxima Pathfinder Murano G35 M35 M45 QX4 FX45 QX56 Optima Forte Genesis 2.4L 2.5L 2.7L 3.5L 4.5L 4.6L 5.6L L4 V6 V8 for LFR5AIX-11

The SYKRSS Iridium spark plug set is built to meet or exceed the OE specifications for the LFR5AIX-11 (4469) standard, offering robust ignition performance across a massive range of vehicles, including your G35. These plugs utilize precious iridium metal embedded with a copper core, ensuring fast starting, improved fuel efficiency, and a long service life. This brand focuses heavily on strict quality testing to eliminate common ignition faults like misfiring and poor idling, making them a trustworthy aftermarket option.

Key features that stand out (Bold):
– OE Design Adherence: Meets or exceeds specifications for the 4469/LFR5AIX-11 standard.
– Premium Materials: Iridium metal with an embedded copper core enhances ignition strength.
– Strict Testing: Focused quality control aims to resolve backfiring, misfiring, and poor idling.

Pros:
– Highly competitive pricing for an iridium plug.
– Strong focus on ignition stability and fuel efficiency.
– Suitable for a wide variety of VQ engines (3.5L V6).

Cons:
– Extremely broad compatibility listing might confuse first-time buyers regarding exact fitment.

Best for:
Value shoppers who need iridium quality and longevity based on the standard 4469 specification.

Expert Opinion: The combination of iridium durability and a copper core for conductivity is a proven design strategy. If you trust the 4469 specification is correct for your model year G35, these are a solid value proposition.

Comparison Insights: Choosing the Right Plug for Your G35

Picking the right spark plug for your G35 often boils down to balancing budget, lifespan, and your vehicle’s current condition.

If your focus is pure longevity and factory reliability, the NGK 4469 Iridium IX plugs are the safest and most proven choice. They will perform flawlessly for 50,000+ miles.

For G35 owners focused on the best budget option with maximum short-term conductivity, the NGK V-Power plugs are unbeatable. Just remember to schedule replacements more frequently.

If you are approaching the 100,000-mile mark or experiencing intermittent misfires, consider the comprehensive kit approach offered by the UF401 or LCWRGS bundles. Replacing the ignition coils and spark plugs together is highly recommended for preventative maintenance on the VQ engine and offers significant cost savings over buying components separately.

For those with later model G35 Sedans (often 2007+), ensure you verify if your car requires the DILKAR7B11 specification; if so, the Double Iridium plugs (like the 1406 replacement set) offer the maximum possible lifespan.

Ultimately, the VQ35DE is designed to run best on quality iridium or platinum plugs. Avoid generic copper plugs unless you plan on tuning frequently or changing them every oil change. Iridium provides the most stable long-term performance in this engine platform.

Final Verdict: Our Top Picks for Your Infiniti G35

Choosing the absolute best spark plug depends on whether you are looking for long-term reliability or maximum budget value.

🥇 The All-Around Champion (Reliability & Performance): The NGK 4469 Iridium IX Spark Plugs LFR5AIX11 (6 Pack) takes this spot. NGK is the trusted OE manufacturer for a reason, and the Iridium IX line provides the optimal balance of strong spark, fuel efficiency, and lifespan for the G35.

💰 The Smart Value Pick (Longevity & Savings): For those who need to address failing ignition components alongside worn plugs, the UF401 Ignition Coil & 4469 Double Iridium Spark Plug 6PCS kit offers an incredible deal. You get high-quality Double Iridium plugs and brand-new coils in one go, saving installation time and money.

⚡ The Budget Go-To (Conductivity): If you just need a quick, highly conductive refresh and plan to swap them out frequently, the 6 pc NGK V-Power Spark Plugs provide reliable copper performance at a fraction of the iridium price.

Best Spark Plugs For G35. FAQ Section

Q1: What is the correct spark plug gap for the Infiniti G35 (VQ35DE engine)?

The recommended spark plug gap for most Infiniti G35 VQ35DE engines is usually 0.044 inches (1.1 mm). However, you should always consult your specific vehicle owner’s manual or the plug manufacturer’s specifications, especially when using upgraded iridium or double platinum plugs, as many high-end plugs come pre-gapped.

Q2: How often should I replace my spark plugs in the Infiniti G35?

The replacement interval depends on the plug material.
* Copper Plugs (e.g., NGK V-Power): Every 30,000 miles.
* Iridium/Platinum Plugs (e.g., NGK Iridium IX 4469): Generally 60,000 to 100,000 miles. Given the complexity of accessing the rear bank plugs on the G35, using the long-life iridium options is usually the most practical choice.

Q3: Why is spark plug replacement difficult on the VQ35DE engine?

The difficulty in replacing spark plugs on the VQ35DE (found in the G35 Coupe and Sedan) stems from the position of the rear three cylinders (Cylinders 1, 3, and 5). Accessing these plugs requires removing the upper intake manifold (plenum) and the associated throttle body components, which adds significant time and complexity compared to standard V6 or V8 layouts.

Q4: Should I choose copper, platinum, or iridium spark plugs for performance driving in my G35?

For general high-performance street driving in the G35, Iridium is the best choice. It offers the best combination of strong, reliable spark and resistance to heat and wear, lasting significantly longer than copper. Copper plugs offer maximum conductivity but degrade quickly, while platinum provides good durability but is often surpassed by the ignition efficiency of iridium.

Q5: Is it necessary to replace the ignition coils when replacing the spark plugs?

It’s not always strictly necessary, but it is highly recommended, especially if your G35 has over 100,000 miles or if you are already removing the intake manifold. Since the labor is intensive due to the plenum removal, replacing both the spark plugs and ignition coils prevents you from having to repeat the process if a coil fails shortly after replacing the plugs.

Q6: Can poor spark plugs affect my G35’s fuel economy?

Absolutely. Worn out or incorrectly gapped G35 spark plugs lead to incomplete combustion (misfires), forcing the engine control unit (ECU) to dump more fuel into the cylinders to compensate. This directly reduces fuel efficiency and can cause rough idling, acceleration hesitation, and potentially trigger the check engine light.