Best Spark Plugs For Lexus GS 350

When I bought my Lexus GS 350, I immediately knew that keeping up with routine maintenance, especially the spark plug replacement, was key to maintaining that smooth V6 power. After 80,000 miles, I noticed a slight hesitation and decided it was time to upgrade. Finding the best spark plugs for the Lexus GS 350 isn’t just about longevity; it’s about restoring that crisp throttle response and optimizing engine performance. We’re going to break down the top iridium options available today, comparing OEM equivalents and aftermarket kits to help you make the right choice for your luxury sedan.

IMAGE	PRODUCT NAME	AMAZON LINK
	BDFHYK Ignition Coil Pack UF487 and Iridium Spark Plug…	View on Amazon
	TAUTOY UF487 Ignition Coil 6619 Spark Plug For Lexus ES…	View on Amazon
	NGK 6619 Iridium Spark Plugs LFR6AIX-11-6 PCSNEW	View on Amazon
	A-Premium Double Iridium Spark Plug Compatible with Lexus…	View on Amazon
	BDFHYK 6858 Iridium Spark Plugs Compatible with Lexus…	View on Amazon
	6 pc NGK Iridium IX Spark Plugs compatible with Lexus…	View on Amazon
	6 pc NGK Iridium IX Spark Plugs compatible with Lexus…	View on Amazon
	SYKRSS Set of 6 Ignition Coil Pack UF267 and Iridium…	View on Amazon
	ECCPP 9091902269 4 ignition coils with 4 iridium Spark…	View on Amazon
	Iridium Spark Plugs 6 Pack Compatible with 2006-2015 Lexus…	View on Amazon

BDFHYK Ignition Coil Pack UF487 and Iridium Spark Plug 6619 Compatible with Lexus ES350 2007-2015 Lexus RX350 Toyota RAV4 Avalon Camry Toyota Sienna Toyota Coil Pack Coil for Lexus 3.5L Set of 6

This kit is an excellent value proposition, especially if your GS 350 is creeping past the 100,000-mile mark and you suspect the original ignition coils might be getting weak. It provides a full set of iridium spark plugs and new UF487 coil packs, which are crucial for ensuring the vehicle starts quickly and maintains high-quality power delivery. BDFHYK focuses on using high-grade materials like Japan-imported rubber and iridium electrodes to guarantee OE-level durability and performance, solving common high-mileage issues like hesitation and misfires.

Key features that stand out:
– Full Set Combo: Includes both 6 Iridium Spark Plugs (6619) and 6 matching Ignition Coil Packs (UF487).
– High-Quality Construction: Coils use silicon steel and high-grade wire for long life.
– Improved Responsiveness: Designed to help the car start quickly and speed up powerfully.

Pros:
– Excellent all-in-one value, replacing two critical components.
– Uses durable, high-spec materials.
– Direct replacement for the V6 3.5L engine.

Cons:
– Aftermarket brand means long-term reliability is unproven compared to NGK/Denso.

Best for:
GS 350 owners tackling a comprehensive 100k+ mile tune-up who need new coil packs and plugs simultaneously.

Expert Opinion: This set is a smart choice for preventative maintenance on older models. Since the labor to replace coils is the same as replacing plugs on the GS 350, combining both items offers significant cost savings down the road compared to buying them separately.

TAUTOY UF487 Ignition Coil 6619 Spark Plug For Lexus ES GS IS LS LX NX RC RX,For Toyota 4Runner Avalon Camry FJ Land Cruiser Highlander RAV4 Sequoia Sienna Tundra Venza 2005-2021, Set of 6

Similar to the BDFHYK offering, the TAUTOY kit provides a complete ignition overhaul, featuring both the UF487 ignition coils and 6619 spark plugs. TAUTOY emphasizes strict quality control, engineering their components to meet or exceed OE standards for spark energy and durability. If you’re looking for a reliable, comprehensive replacement set that ensures precise, corrosion-resistant connections and eliminates poor idling or hesitation, this package is designed to provide premium, long-lasting performance.

Key features that stand out:
– OE Matched Numbers: Includes numerous cross-referenced OEM part numbers for exact fitment confirmation.
– Premium Materials: Utilizes high conductive copper wire and high dielectric epoxy for improved connectivity.
– Certified Facilities: Manufactured in TS16949 certified facilities, ensuring rigorous quality testing.

Pros:
– Comprehensive 12-piece set for a total ignition system refresh.
– Guaranteed 1-year warranty for peace of mind.
– Focus on quality control and OE matching specs.

Cons:
– While TS16949 certified, it still carries the risk associated with non-OEM electrical components.

Best for:
Owners prioritizing a complete ignition system replacement under a tight budget who still demand certified manufacturing standards.

Expert Opinion: The inclusion of premium copper wiring and strong epoxy in the coil construction is critical for handling the voltage spikes in the GS 350’s 3.5L engine. This is a very solid combo kit option for high-mileage GS 350 maintenance.

NGK 6619 Iridium Spark Plugs LFR6AIX-11-6 PCSNEW

NGK is the gold standard when it comes to ignition components, often supplying Lexus and Toyota directly. The 6619 (LFR6AIX-11) is an Iridium IX plug renowned for its narrow 0.6mm fine-wire center electrode, which maximizes spark efficiency. These plugs are engineered to handle a wide range of heat, making them resistant to both carbon buildup during slow city driving and pre-ignition during hard acceleration. If you want guaranteed factory-level performance, NGK Iridium is where you look first.

Key features that stand out:
– Iridium IX Technology: Offers extremely high durability and maximum spark efficiency.
– Triple Gasket Sealing: Patented design prevents combustion gas leakage, enhancing plug lifespan.
– Wide Heat Range: Highly resistant to fouling and pre-ignition for reliable performance in all conditions.

Pros:
– Trusted, world-class brand, often an OEM equivalent.
– Exceptional durability and longevity (typically 80k–100k miles).
– Improves throttle response and ignition stability.

Cons:
– More expensive than most generic iridium options on the list.

Best for:
Lexus owners who demand the absolute highest reliability and performance consistency, and prefer a trusted OEM supplier.

Expert Opinion: If your current coil packs are known good, sticking to an NGK Iridium IX plug is arguably the smartest decision you can make for performance maintenance on the GS 350. It’s engineered specifically for this type of V6 engine configuration.

A-Premium Double Iridium Spark Plug Compatible with Lexus IS250 2006-2015, IS300 2016-2017, IS350 2006-2017, GS300 2006, GS350 2007-2011 2013-2015, GS450h 2007-2011, RC300 2016-2017, RC350, Pack of 6

A-Premium brings a Double Iridium solution to the table, meaning both the center electrode and the ground electrode feature iridium or platinum tips. This dual-tipped design significantly extends the lifespan of the plug, potentially reaching replacement intervals of 100,000 miles or more, which aligns perfectly with Lexus’s demanding maintenance schedule. Engineered for maximum ignition performance, these plugs ensure precise fitment and exceptional ignitability right out of the box.

Key features that stand out:
– Double Iridium Technology: Center tip is Iridium, core is Platinum, maximizing longevity and stability.
– Long Replacement Interval: Recommended replacement mileage is 80,000 to 100,000 miles.
– OE Compatibility: Designed alongside OEMs for exact fitment and performance specs.

Pros:
– Superior longevity due to dual precious metal tips.
– Pre-set gap between 0.039″-0.043″, simplifying installation.
– Excellent value for a double precious metal plug.

Cons:
– While durable, the ignition performance might not feel as crisp as a single fine-wire NGK Iridium IX.

Best for:
Drivers who want maximum durability and the longest possible replacement interval between maintenance visits.

Expert Opinion: The Double Iridium construction is fantastic for long-term engine health and reducing maintenance frequency. Always double-check the pre-set gap on Double Iridium plugs, even if they claim to be pre-gapped for the Lexus 3.5L V6 engine.

BDFHYK 6858 Iridium Spark Plugs Compatible with Lexus 2006-2017 GS300 GS350 GS350 GS450h IS F IS250 IS300 IS350 RC300 RC350 2.5L 3.0L 3.5L V6 Set of 6

This is a spark plug-only offering from BDFHYK, focusing on the highly compatible 6858 specification. These plugs utilize fine iridium electrodes and high-density isostatic ceramics for superior insulation and ignition performance. They are marketed specifically to “Relive Performance,” suggesting they effectively restore the power and throttle sensitivity lost through decades of wear. For a straightforward, cost-effective replacement that meets OE standards, this set is a strong contender.

Key features that stand out:
– Performance Focused: Claims faster and more sensitive ignition jumps and increased power output.
– Isostatic Ceramics: Provides excellent high-density insulation and strength.
– Broad Lexus Fitment: Covers various GS, IS, and RC models with the 3.5L V6.

Pros:
– Very competitive price point for an iridium set.
– Focuses on restoring lost power and efficiency.
– Comes with a 12-month quality service guarantee.

Cons:
– Durability reports vary widely compared to premium brands.

Best for:
Budget-conscious DIYers needing a quick, reliable performance restoration without breaking the bank on an OEM brand name.

Expert Opinion: If you previously had the 6619 plugs installed, the 6858 is generally seen as an excellent cross-reference option for the Lexus GS 350 V6 engines, providing similar benefits at a lower cost.

6 pc NGK Iridium IX Spark Plugs compatible with Lexus ES350 3.5L V6 2007-2018

While the title specifically lists ES350, this six-pack of NGK Iridium IX plugs is compatible with many Lexus 3.5L V6 engines, including the GS 350 (2007-2015). This is the standard, reliable NGK offering—known for being a direct, trouble-free replacement. If you appreciate the genuine quality of NGK without needing the added cost of a combination kit, this is the way to ensure your engine receives the best possible spark, maintaining optimal Lexus GS 350 engine performance and fuel economy.

Key features that stand out:
– Genuine NGK Parts: Assurance of receiving authentic, high-quality components.
– Direct Replacement: No modification required, fits the 3.5L V6 perfectly.
– Optimal Fuel Economy: Fine iridium tip ensures efficient fuel burn.

Pros:
– Highly dependable brand with proven V6 compatibility.
– Comes in original packaging with all necessary hardware.
– Excellent performance characteristics.

Cons:
– Limited to spark plugs only; does not include coils.

Best for:
GS 350 owners with low to moderate mileage who are performing preventative spark plug maintenance using the most trusted brand.

Expert Opinion: When buying name-brand spark plugs, always ensure the seller is reputable to avoid counterfeit products. The NGK Iridium IX line offers a fantastic balance of longevity and immediate performance benefit.

6 pc NGK Iridium IX Spark Plugs compatible with Lexus RX350 3.5L V6 2007-2015

This package is essentially the same high-quality NGK Iridium IX product as the previous entry, packaged for cross-compatibility with the Lexus RX350, which shares the same 3.5L V6 engine (2GR-FE) as the GS 350 during these years. The benefit of selecting these is the brand assurance and the simple installation process, backed by the knowledge that NGK products are built to withstand the rigorous demands of a luxury V6 engine, providing resistance to misfires and ensuring a strong, stable idle.

Key features that stand out:
– Identical Iridium IX Specs: Shares the same performance characteristics as other NGK iridium plugs.
– V6 3.5L Engine Compatibility: Perfect fit for the 2GR-FE engine found in the GS 350.
– Reliable Startup: Ensures strong ignition, especially important in cold weather.

Pros:
– Genuine, OEM-quality part substitute.
– Excellent track record for longevity.
– Reliable performance boost over worn-out standard plugs.

Cons:
– Can sometimes be priced slightly higher due to specific packaging/listing.

Best for:
Owners prioritizing brand reliability over cost, seeking guaranteed compatibility with their GS 350 3.5L V6.

Expert Opinion: While listed for the RX350, always verify the specific NGK part number against your GS 350’s factory requirements. If the numbers match (like 6619), you can buy with confidence.

SYKRSS Set of 6 Ignition Coil Pack UF267 and Iridium Spark Plugs 4504 6 Pack Compatible with Lexus ES300 ES330 RX300 RX330 RX400 Avalon Camry Highlander Sienna 3.0L 3.3L V6 Replaces C1175

Note: It is crucial to read the fitment closely on this SYKRSS kit, as it is designed for older 3.0L and 3.3L V6 engines, not the 3.5L V6 found in most GS 350 models (2007+). While this kit offers excellent value for the older Lexus engine platform, it is not suitable for the 3.5L GS 350. We include it here as a cautionary example of why checking the engine size is vital when purchasing combo kits. For those with earlier GS models utilizing the 3.0L V6, this comprehensive kit solves common misfire and poor idling problems.

Key features that stand out:
– Fixes Ignition System Failures: Targets misfires, engine jerking, and hard stalling associated with worn components.
– High Temperature Resistance: Coils are made with heat-resistant material for improved durability.
– 24-Month Warranty: Provides a long-term guarantee on the components.

Pros:
– Great value and long warranty for compatible 3.0L/3.3L V6 engines.
– Coils and plugs are tested to operate reliably across the full engine speed range.

Cons:
– NOT COMPATIBLE with the standard 2007-2015 Lexus GS 350 3.5L V6 engine.

Best for:
Lexus owners with older V6 engines (pre-2007) like the ES300 or RX330, not the GS 350.

Expert Opinion: While not applicable to most GS 350 owners, this highlights the general quality and comprehensive warranty offered by SYKRSS for those needing a full ignition kit for earlier Lexus/Toyota 3.0L V6 platforms.

ECCPP 9091902269 4 ignition coils with 4 iridium Spark Plugs for Lexus NX200t GS200t IS200t RC300 90919-02240 UF-811

Note: This ECCPP kit is specifically designed for the newer 2.0L L4 Turbo engines found in models like the GS200t (2016-2017) and later GS300. It is not the correct kit for the V6 3.5L GS 350. However, for owners of the later-generation 4-cylinder turbocharged models, this kit offers a powerful upgrade. ECCPP claims its coils provide 15% more energy than OE coils, improving cold-start performance and ensuring a smoother running engine, often replacing the OEM part 9091902269.

Key features that stand out:
– Turbo-Optimized: Designed for the high demands of the 2.0L L4 Turbo engine.
– Enhanced Coil Performance: Upgrades the ignition system with 15% more energy output.
– 12-Month Warranty: Standard warranty for parts defects.

Pros:
– Significant performance upgrade potential for compatible turbo models.
– High-quality copper wire for superior connectivity.

Cons:
– Only includes 4 plugs and coils; incompatible with the V6 GS 350.

Best for:
Owners of the 4-cylinder turbocharged Lexus models (GS200t or IS200t/IS300 2.0L Turbo), not the V6 GS 350.

Expert Opinion: Turbo engines demand extremely high-quality plugs and coils to avoid damaging misfires. While this set is unsuitable for the 3.5L V6, its enhanced energy output makes it a compelling choice for the turbo models it fits.

Iridium Spark Plugs 6 Pack Compatible with 2006-2015 Lexus IS250 IS350 GS350 GS450h V6 2.5L 3.5L 2007 2008 2009 2010 2011 2012 2013 2014 2015 Replaces 6858, DFH6B11A

This unbranded Iridium 6-pack is another excellent direct replacement for the 6858 (DFH6B11A) specification, perfectly fitting the V6 3.5L GS 350. The key selling point here is the focus on fuel efficiency. These plugs feature a fine 0.6mm iridium center-wire tip design paired with laser-welded technology, engineered to maximize the efficiency of the burn and minimize fuel consumption. They also undergo rigorous quality testing to eliminate issues like car shaking and poor fuel economy often associated with worn plugs.

Key features that stand out:
– Fine-Wire Iridium Tip: Uses a 0.6mm tip design for maximum fuel efficiency and optimized spark jump.
– Laser Welded Technology: Ensures stability and durability of the fine electrode.
– Rigorous Quality Control: Tested to address common ignition system failures effectively.

Pros:
– Strong focus on restoring fuel economy.
– Direct fitment for 2007-2015 GS 350 models.
– Comes with a 12-month worry-free warranty.

Cons:
– Being an unbranded option, performance consistency can sometimes be a minor concern.

Best for:
Drivers whose primary goal is maximizing their mileage and restoring the original fuel economy of their Lexus GS 350.

Expert Opinion: Iridium fine-wire tips are critical for modern GDI (Gasoline Direct Injection) engines like the 3.5L V6. This set utilizes the correct technology to deliver a strong, clean spark across the full performance range.

Comparison Insights for Best Spark Plugs For Lexus GS 350.

Choosing the right spark plug replacement for your Lexus GS 350 often comes down to balancing longevity, performance, and budget. Here are a few key insights drawn from these comparisons:

The Combo Kit Advantage: The BDFHYK and TAUTOY kits (Products 1 & 2) offer incredible value. If your GS 350 has over 100,000 miles, replacing the coils along with the plugs is often recommended, as coil failure leads to expensive misfires. These kits streamline the replacement process and save on potential future labor costs.

OEM Trust vs. Aftermarket Value: NGK (Products 3, 6, 7) is the established leader and often the brand Lexus uses from the factory. While they are slightly more expensive, you are paying for reliability and a guarantee of optimal performance. Aftermarket options like BDFHYK and the Iridium 6 Pack (Products 5 & 10) are substantially cheaper and rely heavily on the reliable iridium 6858 specification but may not offer the exact same long-term consistency as NGK.

Understanding Iridium Types: The NGK Iridium IX (a fine-wire single-iridium design) is known for its pure performance and powerful, consistent spark. In contrast, the A-Premium Double Iridium plugs (Product 4) prioritize lifespan, using platinum in conjunction with iridium. If performance responsiveness is key, stick with the fine-wire NGK. If maximum mileage between changes is the goal, Double Iridium is the better choice.

Critical Fitment Check: Be extremely cautious with combo kits. As seen with the SYKRSS and ECCPP products (8 & 9), these kits often target specific engine variants (like the 3.0L V6 or 2.0L Turbo). Always confirm the kit fits your specific 3.5L V6 (2GR-FSE/2GR-FE) engine code before purchasing, regardless of the model year listed.

Final Verdict

If you’re looking to restore your GS 350 to its peak condition, here are our top picks based on specific needs:

The Longevity Champion (Best for Minimal Maintenance):
The A-Premium Double Iridium Spark Plug is the winner here. Designed for the 80,000 to 100,000-mile interval, these plugs offer supreme durability, meaning you won’t have to worry about the job again for years.

The Performance & Reliability Pick (Trusted OEM Equivalent):
The NGK 6619 Iridium Spark Plugs LFR6AIX-11 (Product 3, 6, or 7) is the benchmark. You simply can’t beat the quality, fit, and proven track record of NGK for maintaining that smooth V6 power delivery.

The Best Value Combo Kit (Comprehensive High-Mileage Tune-up):
The BDFHYK Ignition Coil Pack UF487 and Iridium Spark Plug 6619 Set offers the most practical value. If your GS 350 has high mileage and you’re already doing the labor, replacing the coils alongside the plugs is the smartest preventative maintenance move.

FAQs About the Best Spark Plugs for Lexus GS 350

What are the main benefits of using iridium spark plugs in the Lexus GS 350?

The Lexus GS 350 3.5L V6 engine is designed to use high-performance plugs. Iridium is the best material because it is extremely hard and has a very high melting point. This allows the electrode to be much finer (0.6mm), requiring less voltage to jump the gap. The benefits include longer service life (typically 80k–100k miles), improved fuel economy, and more reliable ignition, which reduces the chance of misfires and maintains optimal engine performance.

How often should I replace the spark plugs in my GS 350?

Lexus recommends a spark plug replacement interval of generally every 60,000 to 80,000 miles for the 3.5L V6 engine (2GR-FSE). If you are using premium, long-life iridium plugs (like NGK Iridium IX or double iridium), you can often extend this to 100,000 miles. Always check your specific Lexus GS 350 maintenance schedule for the exact recommendation based on your model year.

Do I need to gap new iridium spark plugs for my Lexus GS 350?

Most modern iridium spark plugs, especially those from reputable brands like NGK or Denso, come pre-gapped specifically for the V6 3.5L engine. However, it is always a smart practice to visually confirm the gap using a wire-style feeler gauge. The correct gap for the GS 350 is usually between 0.039 and 0.044 inches. Be extremely careful not to physically touch the fine iridium tip when checking the gap, as this can easily damage the electrode.

How do I know if my Lexus GS 350 needs new spark plugs or coil packs?

Common signs that your Lexus GS 350 engine needs service include hesitation during acceleration, rough idling, difficulty starting, and a noticeable drop in fuel economy. If the issue is severe, you will likely experience misfires and the Check Engine Light (CEL) will illuminate, often with codes like P0301-P0306 indicating a cylinder misfire. If your car is high mileage (over 100k), consider replacing the coil packs along with the plugs.

Should I choose a single iridium or double iridium spark plug?

Single iridium (fine wire tip) plugs, like the NGK Iridium IX, offer superior performance and a more consistent spark over their lifetime. Double iridium plugs (with iridium/platinum on both electrodes) are designed primarily for longevity, maximizing the time between replacement intervals. For the GS 350, both are excellent choices, but the single fine-wire design is preferred if you prioritize responsive performance.

Is the spark plug replacement job difficult on the Lexus GS 350?

The spark plug replacement on the GS 350’s 3.5L V6 engine can be challenging for an amateur due to the location of the rear bank of cylinders (under the intake manifold). While the front three cylinders are easily accessible, the rear three require removing the intake manifold, which adds significant complexity and labor time. This is why many owners choose to use long-life iridium plugs to minimize the frequency of this labor-intensive job.