2 Best Spark Plugs For Lexus Gs 350

You rely on your Lexus GS 350 to deliver smooth power, efficient fuel use, and dependable starts. Replacing spark plugs with the right parts helps maintain engine performance and can improve fuel economy and drivability.

This short guide helps you pick between two Iridium replacement sets that fit the GS 350 so you can get back on the road with confidence.

Top Picks

Selection Criteria

You want replacements that fit your GS 350, offer long life, and won’t introduce drivability issues. We focused on: compatibility (matching OEM part numbers and years), core material (Iridium for longevity and stable spark), customer feedback (real-world fit, performance, and any issues like inconsistent gaps), price and value, and clarity of product specs (OEM numbers, ASIN, and manufacturer info). We also weighed reported installation experience so you know whether plugs install easily or may require careful gapping.

Finally, we factored overall ratings and the balance between performance and cost so you can choose the option that fits your priorities.

BDFHYK 6858 Iridium Spark Plugs (6PCS)

These BDFHYK 6858 iridium plugs give you the same basic performance cues you’d expect from OEM-style replacements: fine iridium center electrodes, sturdy ceramic insulators and a fit that matches a lot of Lexus V6 engines. If you drive your GS 350 every day, they help keep ignition crisp and steady; if you’re doing a longer trip or the occasional spirited run, they hold up well and can feel like a small tune-up. You’ll want to check the gaps before installation — a few buyers found inconsistent gaps out of the box — but once gapped correctly they deliver reliable starts and smooth idling.

If you want a practical, widely compatible replacement without hunting OEM part numbers, these are a sensible option to keep on your maintenance list.

Pros and Cons

What People Say

You’ll see a lot of people saying these work well once gapped correctly — many customers report smooth starts, good performance and an exact fit for their Lexus, though a handful flagged inconsistent gaps out of the box.

Overall Sentiment: Positive

Ease Of Use

Versatility

Fits a broad range of Lexus models (GS300/GS350, IS series, RC, LS) and works well for daily driving, highway commuting and occasional spirited runs. Also useful as a straightforward replacement during scheduled tune-ups.

Key Benefits

• Iridium center electrode for improved ignition reliability
• OE-level fit for many Lexus models (2006–2017)
• Durable ceramic insulators and TS16949 manufacturing claim
• Comes as a set of 6 — convenient for V6 engines

Rating: 4.4 (total: 100+)

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A-Premium Double Iridium Spark Plugs (Set of 6)

If you drive a GS 350 you’ll appreciate a plug that fits like the factory part and keeps ignition steady. These A-Premium plugs use an iridium tip with a platinum core, come pre-set to about 0.039–0.043 in, and are made to match OEM-style reach and hex size.

For daily commuting they help maintain smooth idle and reliable starts; on longer trips or when you push the engine a bit, they tend to hold up and feel like a tidy little tune-up. They’re sold as a set of six, so you can swap the whole V6 at once.

Make sure you pick the right year and model before ordering and double-check the preset gap during install — otherwise they usually bolt in and behave like a straightforward replacement. If you want a practical, widely compatible option for routine maintenance, these are worth keeping on your parts shelf.

Pros and Cons

What People Say

Buyers report these plug in like originals and are straightforward to install; several owners noticed a small boost in MPG and throttle response, while a few mentioned slower shipping times.

Overall Sentiment: Positive

Ease Of Use

Versatility

Fits a broad range of Lexus V6 models (GS300/GS350, IS series, RC) and works well for everyday driving, highway commuting and occasional spirited runs. Handy for scheduled tune-ups or when you want a full cylinder bank refresh.

Key Benefits

• Iridium center electrode with platinum core for reliable ignition
• Preset gap (0.039–0.043 in) suitable for many Lexus V6 engines
• OE-style fit and reach for direct replacement on compatible models
• Sold as a set of 6 — convenient for full V6 replacement
• Engineered for longevity; recommended replacement intervals up to 80,000–100,000 miles

Rating: 4.5 (total: 31+)

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FAQ

Which Spark Plugs Are Best For A Lexus GS 350?

You’ll find two strong aftermarket choices: the BDFHYK 6858 Iridium set and the A-Premium Double Iridium set. Both are listed as compatible with many Lexus GS350 model years and use iridium cores for longer life and more consistent ignition than standard copper plugs.

The A-Premium option tends to have slightly higher customer ratings and explicitly lists OEM part numbers (including 6858/DFH6B11A), while the BDFHYK set is frequently noted for value but has some user reports about inconsistent factory gaps. Before you buy, verify vehicle compatibility and the OEM part number to make sure the plugs match your engine and model year.

How Do I Install And Maintain Iridium Spark Plugs In My GS 350?

When you install iridium plugs you should replace all plugs at once and inspect the ignition coils and boots while you’re working. Clean the spark plug wells, hand-thread each plug to avoid cross-threading, and then tighten with a torque wrench to your vehicle manufacturer’s specification rather than guessing. Use a small amount of dielectric grease on the inside of the boot if recommended, but avoid anti-seize on plated threads unless the plug maker specifies it.

Always check and correct the spark plug gap with a feeler gauge before installation and re-check for ceramic chips or electrode damage; iridium electrodes are thin and don’t tolerate heavy re-gapping. After installation, run the engine and watch for misfires or rough idle—if you see issues, re-check gaps, torque, and coil connections.

What Common Problems Or Misconceptions Should I Watch For?

You might hear that all aftermarket plugs are unreliable or that bigger brands are the only safe choice; in reality, quality varies by maker so you should read reviews and confirm fitment and part numbers. A frequent complaint with inexpensive sets is inconsistent pre-set gaps straight from the box, so don’t skip the gap check. Another misconception is that you can aggressively re-gap iridium plugs—avoid large gap adjustments because the fine iridium tip can fracture. If you get new misfires after swapping plugs, isolate the problem by swapping coils between cylinders, inspect connectors and boots, and confirm you used the right heat range and plug reach for your engine.

Keep one old plug as a reference when shopping so you can confirm thread length and seat type match.

What Buyers Prefer

When choosing between the BDFHYK 6858 Iridium and the A-Premium Double Iridium sets, you typically prioritize correct OEM fit and consistent ignition first so your GS 350 runs smoothly, then durability and spark strength—the double-iridium option appeals if you want maximum lifespan and stronger spark. Price, gap accuracy out of the box, and ease of installation are secondary factors that help you decide which set gives the best value for your driving needs.

Wrapping Up

If you want the safest drop-in replacement with strong user feedback and OEM part number support, choose the A-Premium Double Iridium set — it offers reliable fit and good longevity for your GS 350. If you’re focused on upfront cost and value, the BDFHYK set is budget-friendly at $26.09 for six plugs, but you should check and adjust the gaps before installation because some buyers reported inconsistent factory gaps.

In either case, verify the correct part number for your model year, confirm gap settings, and torque to manufacturer spec when you install so you get reliable starts, smooth idle, and the best fuel efficiency.

	BDFHYK 6858 Iridium Spark Plugs	A-Premium Double Iridium Spark Plug
Rating	4.4/5 (100 reviews)	4.5/5 (31 reviews)
Core Material	Iridium	Iridium
Item Weight	11.9 ounces	11.3 ounces
Vehicle Compatibility	Compatible with Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350 (2006-2017)	Compatible with Lexus IS250, IS300, IS350, GS300, GS350, GS450h, RC300, RC350 (2006-2017)
	Buy Now	Buy Now

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