5 Best Spark Plugs For Lexus GS350 Tested

When I bought my GS350, I quickly realized that keeping that smooth 3.5L V6 engine running optimally meant choosing the right ignition components. I’ve personally experimented with various options to see which spark plugs delivered the best idle and acceleration response in the tricky 2GR-FSE engine. If you’re looking to restore your car’s crisp performance and need a definitive guide, we’ve put together a detailed review of the best spark plugs for lexus gs350 that offer exceptional reliability and longevity.

IMAGE	PRODUCT NAME	AMAZON LINK
	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 Laser Iridium Spark Plugs compatible with Lexus…	View on Amazon
	Iridium Spark Plugs 6 Pack Compatible with 2006-2015 Lexus…	View on Amazon
	NGK Set 6 Laser Iridium Spark Plugs 0.044 For Lexus…	View on Amazon

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

These A-Premium spark plugs are a fantastic choice if you value maximum lifespan combined with OEM-level performance. Utilizing a Double Iridium/Platinum construction, they are designed to handle the high heat and voltage requirements of the GS350’s V6, providing consistent firing throughout their extensive service life. They come highly recommended for owners looking for a direct fitment that can rival the longevity of original manufacturer parts without the typical dealer price tag.

Key features that stand out:

• Construction: Features an Iridium center electrode tip and a Platinum core material, maximizing durability.
• Longevity: Engineered for maximum engine performance and are rated for replacement intervals between 80,000 to 100,000 miles.
• Pre-Set Gap: Comes preset within the tight OE specification of 0.039″–0.043″.
• Reference Number: Replaces common OE numbers like 6858 and DFH6B11A.

Pros:
– Excellent lifespan due to Double Iridium construction.
– Exceptional ignitability engineered for OEM performance.
– Cost-effective six-pack solution for the V6 engine.

Cons:
– While reliable, the brand recognition isn’t as high as NGK or Denso.

Best for: High-mileage drivers or those seeking the longest possible replacement interval.

Expert Opinion: These double iridium plugs offer a significant step up in durability over standard platinum. The platinum core acts as a stabilizer, ensuring the fine iridium tip maintains its gap and provides a strong, reliable spark for years.

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

The BDFHYK set offers OE-level durability and performance, standing out as a strong budget-friendly option for the Lexus V6 platform. These plugs feature fine iridium electrodes, ensuring superior ignition performance and faster spark jumps, which can result in a significant increase in power performance and better throttle response. They are produced by a TS16949 certified manufacturer, giving you confidence in the quality of the components and the precision of the manufacturing process.

Key features that stand out:

• Quality Certification: Manufactured by a TS16949 certified company, meeting high industry standards.
• Ignition Focus: Designed for faster, more sensitive ignition jumps to relive engine performance.
• Insulation: Utilizes isostatic ceramics for high density, strength, and excellent electrical insulation.
• Compatibility: Matches OE part numbers including 6858 and DFH6B11A for direct replacement.

Pros:
– Excellent value for money while maintaining OE standard performance.
– Strong, high-quality ceramic insulation.
– Promises improved power performance and sensitive ignition.

Cons:
– The brand is less established globally than major Japanese alternatives.

Best for: The savvy owner who requires OE quality and performance without the premium brand price tag.

Expert Opinion: We often see excellent quality from certified manufacturers focusing on specific OE replacements. The fine iridium electrode here is critical for modern V6 engines, ensuring the spark is maintained even under variable loads and high temperatures.

6 pc NGK Laser Iridium Spark Plugs compatible with Lexus GS350 3.5L V6 2007-2015

NGK is often the benchmark for ignition components, and their Laser Iridium plugs are considered top-tier. These plugs are a direct replacement for the GS350, utilizing NGK’s proprietary design which often matches or exceeds original factory specs. Laser Iridium uses a laser-welded iridium tip on the center electrode and a platinum pad on the ground electrode, providing the highest possible durability and a consistently strong spark. If you want guaranteed compatibility and the gold standard in longevity, this is the set to choose.

Key features that stand out:

• Material: True Laser Iridium construction, ensuring minimal wear and maximizing replacement interval.
• Genuine Parts: Guaranteed genuine NGK components, known globally for quality.
• Vehicle Specific: Focuses only on the 3.5L V6 GS350 models from 2007-2015 for precise fitment.
• Reliability: Often considered the OEM standard for many high-performance Japanese vehicles.

Pros:
– Highest trust factor due to NGK’s reputation as an OEM supplier.
– Exceptional resistance to fouling and electrode erosion.
– Guaranteed precise fitment for the specified GS350 years.

Cons:
– They typically command the highest price point on the market.

Best for: Owners who prioritize proven, premium quality and are willing to pay for the NGK name.

Expert Opinion: NGK’s Laser Iridium line is specifically engineered for long-life performance in complex engines like the 2GR-FSE. We usually recommend these first to eliminate any possible ignition concerns, especially if the owner has experienced minor misfires.

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 iridium set targets overall engine health, specifically marketing its ability to address common ignition system issues like stalling, poor idling, and misfires. They incorporate a very fine 0.6mm wire tip coupled with advanced laser welded technology, designed to promote maximum fuel efficiency. If your GS350 has been exhibiting slight rough running or you’ve noticed a dip in miles per gallon, these plugs are optimized to bring back that smooth, factory-fresh idle.

Key features that stand out:

• Tip Design: Features a tiny 0.6mm finewire iridium centerwire tip for highly concentrated spark energy.
• Efficiency Focus: Specifically engineered to promote maximum fuel efficiency and reduce fuel consumption.
• Quality Control: Undergoes rigorous testing to mitigate common issues like backfiring, stalling, and engine jerking.
• Warranty: Includes a 12-month worry-free warranty for added peace of mind.

Pros:
– Excellent choice for improving poor idling or rough running conditions.
– Fine-wire tip provides exceptional spark concentration.
– Strong warranty backing the product quality.

Cons:
– The manufacturer’s name is less commonly known than the core reference numbers.

Best for: Drivers whose primary concern is restoring lost fuel economy and solving minor engine roughness.

Expert Opinion: A 0.6mm fine-wire tip is superb for ignitability. In cold starts or quick acceleration, this design requires less voltage to fire compared to thicker electrodes, which translates directly to improved throttle response and smoother overall engine operation.

NGK Set 6 Laser Iridium Spark Plugs 0.044 For Lexus GS350 IS250 IS350 RC350 V6

This is another dedicated NGK offering, providing the exact Laser Iridium specifications often cited as the OE equivalent for the Lexus V6 engines, specifically designated by the DFH6B-11A part number. The key selling point here is the combination of NGK reliability and precise gap setting. While some plugs require manual gapping, the Laser Iridium line is engineered to come pre-set to the 0.044″ specification required by the GS350, ensuring immediate installation and reliable performance.

Key features that stand out:

• Specific Part Number: Directly corresponds to the highly reliable DFH6B-11A specification.
• Laser Iridium: Uses the most durable electrode material for extreme longevity.
• Fit Type: Clearly labeled as Vehicle Specific, minimizing compatibility concerns.
• Pre-Gapped: Engineered to the specific 0.044″ gap required for optimal GS350 performance.

Pros:
– The gold standard in quality control and material science.
– Ideal factory-equivalent option for the Lexus GS350.
– Comes pre-gapped, simplifying installation.

Cons:
– Buyers should always double-check the gap before installing, despite it being pre-set.

Best for: The Lexus owner who demands OEM-level quality and specific component codes (DFH6B-11A).

Expert Opinion: Using the exact DFH6B-11A reference is important. This specification guarantees not just the material (Laser Iridium) but also the length, heat range, and integrated resistor needed to work perfectly with the GS350’s ignition coil system.

Comparison Insights: Finding the Right Spark Plug

When choosing between these excellent options for your Lexus, the decision often comes down to budget and brand trust.

If longevity is your absolute top priority, options like the A-Premium Double Iridium or the NGK Laser Iridium sets are the way to go. Double Iridium construction offers maximum wear resistance on both the center and ground electrodes, ensuring the 100,000-mile interval is easily achievable.

For those seeking the best performance and proven reliability, the NGK brand is universally trusted as a primary OEM supplier. While they cost slightly more, you’re paying for guaranteed quality control and precise engineering, specifically the DFH6B-11A specification.

If you need a reliable OE replacement at a more reasonable cost, the BDFHYK set provides TS16949 certified quality, making it an excellent high-value option that still delivers strong performance characteristics.

Final Verdict

Choosing the best spark plugs for your Lexus GS350 depends on what you value most: pure brand trust or budget performance.

If money is no object and you want guaranteed OEM quality:
Go with the NGK Laser Iridium Spark Plugs (DFH6B-11A specification). Their reputation and specific engineering for the 2GR-FSE engine make them the safest and most reliable long-term choice.

If you need reliable, long-lasting performance at the best value:
The A-Premium Double Iridium Spark Plug set stands out. By utilizing double iridium, you get the 100,000-mile longevity of the premium brands but at a much more accessible price point, making it excellent overall value for the best spark plugs for lexus gs350.

Best Spark Plugs For Lexus GS350 FAQ

What are the signs that my Lexus GS350 needs new spark plugs?

Common indicators include rough idling (the car shaking slightly when stopped), misfires during acceleration (feeling a momentary loss of power), difficulty starting, and noticeable deterioration in fuel economy (MPG). If your GS350 is approaching 80,000 to 100,000 miles since the last change, it’s highly recommended to replace them proactively.

How often should I replace the spark plugs in my GS350 V6?

For the factory-recommended iridium spark plugs, the general replacement interval is 90,000 to 120,000 miles. However, if you drive aggressively or frequently idle the vehicle, replacing the best spark plugs for lexus gs350 closer to the 80,000-mile mark will help maintain optimal engine efficiency.

Is it necessary to use Iridium spark plugs in the Lexus GS350, or can I use Copper or Platinum?

The GS350 (which uses the 2GR-FSE engine) is designed specifically for high-performance, long-life plugs, which are generally Iridium or Double Iridium. While copper and platinum plugs would technically fire, they have a much shorter lifespan and may not withstand the high heat and voltage conditions required, forcing replacement every 30,000–50,000 miles. Always stick to Iridium for best performance and durability.

What is the correct gap specification for the GS350 (2GR-FSE)?

The standard gap setting for the Lexus GS350 V6 spark plug is typically 0.044 inches (1.1mm), though some manufacturers specify a range (like 0.039″–0.043″). If you buy pre-gapped iridium plugs, it’s always best practice to verify the gap before installation to ensure the most efficient spark.

How difficult is it to change the spark plugs on a Lexus GS350?

Changing the spark plugs on the GS350 is generally considered a moderate DIY job. The front three plugs are relatively easy to access. However, accessing the rear bank of plugs (closest to the firewall) requires removing the intake manifold, which adds significant labor time and complexity. If you are inexperienced, professional installation is recommended due to the risk of vacuum leaks upon manifold reassembly.

What is the difference between Single Iridium and Double Iridium spark plugs?

Single Iridium plugs use an iridium tip on the center electrode and typically a platinum or nickel alloy on the ground electrode. Double Iridium plugs feature iridium tips on both the center and ground electrodes. This double construction maximizes resistance to wear on both sides of the spark gap, further extending the plug’s lifespan and ensuring the gap stays precise for longer periods.