Best Spark Plugs For BMW 335i

I recently went through the process of choosing the right spark plugs for my BMW 335i, and wow, the options are overwhelming! Since the N54/N55 engine loves being run hard, finding the right plug for optimal performance and reliable BMW 335i spark plug replacement is crucial for longevity and smooth power delivery. This guide breaks down the top choices, whether you’re stock or heavily tuned, so you can make an informed choice for your powerful twin-turbo or single-turbo inline-six.

IMAGE	PRODUCT NAME	AMAZON LINK
	ENA Set of 6 Spark Plug Compatible with BMW 1…	View on Amazon
	Autowxjq Ignition Coil Iridium Spark Plugs Set of 6pcs…	View on Amazon
	MOAUTO Set of 6 Ignition Coils Pack UF522 & 6…	View on Amazon
	BOSCH ZGR6STE2 Copper with Nickel Spark Plug – Single	View on Amazon
	UF592 Ignition Coil & 12120032137 Double Iridium Spark Plug…	View on Amazon
	A-Premium Iridium Platinum Spark Plugs Compatible with BMW…	View on Amazon
	BDFHYK Set of 6 Iridium Spark Plug Compatible with BMW…	View on Amazon
	Iridium Platinum Spark Plugs 6 Pack 97506 SILZKBR8D8S…	View on Amazon
	BMW Spark Plugs, Plug Set Laser Platinum NGK OEM 3199…	View on Amazon
	Ignition Coil & Spark Plugs Set of 8 Compatible with…	View on Amazon

Detailed Reviews of the Top 10 BMW 335i Spark Plugs

ENA Set of 6 Spark Plug Compatible with BMW 1 Series M 335is 335xi 535xi 740i 740Li X6 Z4 335i 535i xDrive 2007 2008 2009 2010 2011 2012 2013 2014 3.0L 4.4L 6.0L Replacement for ZGR6STE2

This ENA set offers a fantastic budget-friendly solution for those needing a complete plug change, particularly targeting the early N54 engines (where ZGR6STE2 is the OEM spec). These plugs are designed to match original equipment specifications closely, ensuring an easy, direct fit without complicated re-gapping. They are constructed to handle reliable operation under various driving conditions, making them a great choice for daily drivers focusing on maintaining factory performance standards. The comprehensive compatibility list provides peace of mind regarding fitment.

Key features that stand out:
– Direct OEM replacement for ZGR6STE2 (common N54 plug).
– Designed for reliable operation under all standard conditions.
– Includes a full set of 6 plugs for a complete engine refresh.

Pros:
– Very affordable complete set.
– Excellent direct fitment for many N54 applications.
– Easy and quick installation.

Cons:
– Durability may not match premium iridium plugs under extreme boost.

Best for:
Budget-conscious drivers or those performing routine maintenance on a stock N54 335i.

Expert Opinion: This set is a solid, straightforward replacement option. If you are running stock boost levels and need reliability without breaking the bank, these will get the job done efficiently.

Autowxjq Ignition Coil Iridium Spark Plugs Set of 6pcs UF592 C1638 Compatible with BMW 135i 335i 435i 535i 640i 740i 740Li M235i xDrive X1 X3 X5 X6 M3 Z4 3.0L V6

For those experiencing misfires or simply wanting to overhaul their ignition system, this Autowxjq kit is a comprehensive solution, pairing ignition coils (UF592) with Iridium spark plugs. The company wisely suggests replacing both coils and plugs simultaneously to avoid future ignition faults common in the 335i engine (N54/N55). The Iridium plugs are pre-gapped for direct installation, offering superior heat resistance and better sparking compared to standard plugs, translating to potentially smoother idle and improved power delivery.

Key features that stand out:
– Complete ignition overhaul kit (6 coils and 6 Iridium plugs).
– Iridium spark plugs offer enhanced durability and spark stability.
– Improved ignition system reliability by replacing common failure points simultaneously.

Pros:
– Convenient package for a full ignition system refresh.
– Iridium plugs provide long life and strong spark.
– Includes a 12-month warranty.

Cons:
– Quality of aftermarket coils can sometimes be inconsistent compared to OE.

Best for:
Owners tackling misfires who want to replace both coils and plugs in one go on the N54 or N55 engine.

Expert Opinion: Synchronized replacement of coils and plugs is highly recommended on these BMW engines. This kit provides that convenience, utilizing high-quality Iridium plugs suitable for slightly modded 335i applications.

MOAUTO Set of 6 Ignition Coils Pack UF522 & 6 PCS Iridium Spark Plugs Compatible with BMW E60 E90 E92 E93 135i 335i 535i – 3.0L L6

The MOAUTO offering is another full ignition kit, specifically featuring UF522 coils and Iridium spark plugs, which may target slightly older N54 applications compared to the UF592 kits. This package goes the extra mile by including an ignition coil removal tool, which is a huge benefit given how tight some of the coil boots can be. The Iridium construction ensures low emissions and high energy output, promising reliable performance, especially during hard acceleration where a strong spark is paramount.

Key features that stand out:
– Comprehensive package including 6 coils, 6 Iridium plugs, and a removal tool.
– High heat-resistant compounds used for coil durability.
– Excellent value for a full tune-up kit.

Pros:
– Ignition coil removal tool included (saves time and hassle).
– Utilizes durable Iridium plugs.
– Designed for high energy output and low emissions.

Cons:
– Requires careful fitment verification due to specific coil pack numbering (UF522).

Best for:
DIY mechanics who need all the components for an ignition tune-up, including the specialized tools.

Expert Opinion: The addition of the coil removal tool makes this package stand out for the DIY enthusiast. While you must confirm the UF522 coil compatibility, the overall quality of the plugs and the added convenience are excellent value.

BOSCH ZGR6STE2 Copper with Nickel Spark Plug – Single

This single Bosch plug represents the original equipment quality that many early N54 engines relied upon. Bosch uses a heavy-duty yttrium enhanced nickel-copper center electrode, which provides superior reliability and up to 50% longer life compared to standard copper plugs. Critically for the 335i engine, the copper core offers a broad heat range, making it resistant to both pre-ignition (key for turbocharged cars) and deposit build-up. The nickel-plated threads eliminate the need for anti-seize, saving installation time.

Key features that stand out:
– OEM Quality and Reliability (ZGR6STE2 equivalent).
– Copper core provides broad heat range ideal for turbocharged applications.
– Nickel-plated threads resist corrosion and don’t require anti-seize.

Pros:
– Exceptional long-life durability for a copper/nickel plug.
– Trusted OE manufacturer quality (Bosch).
– Excellent resistance to pre-ignition.

Cons:
– Sold individually, requiring the purchase of six units.

Best for:
Strict OEM adherents or owners of early N54 models needing dependable factory-spec replacements.

Expert Opinion: Bosch is a gold standard in BMW ignition components. If you prioritize OEM quality and performance on a stock N54, this is a highly reliable plug, though you must remember to buy six.

UF592 Ignition Coil & 12120032137 Double Iridium Spark Plug For BMW 128i 325Ci 328i 330Ci 335i 525i 528i 530i 535i 545i 550i 745Li 750i 760i X3 X5 X6 M5 M6 Z4 Mini Cooper Replaces#C1638 12137594937

This high-specification kit couples the popular UF592 ignition coil with a premium Double Iridium spark plug (OE part 12120032137). Double Iridium plugs boast an incredibly long working life, often rated up to 100,000 kilometers, offering the best in durability and consistent, stable spark delivery. The coils themselves utilize stainless-steel springs and advanced thermoplastic connectors to resist heat fracturing, ensuring superior cold-start performance and stable engine running, addressing common failure modes found in the 335i.

Key features that stand out:
– Double Iridium Spark Plug guarantees extreme durability and longevity (up to 100,000 km).
– Premium coil construction prevents radio frequency interference and resists heat cycling.
– Addresses common misfire issues and improves cold-start performance.

Pros:
– Exceptional service life from the double iridium material.
– High-quality materials used in both plugs and coils.
– Ideal solution for long-term engine health.

Cons:
– This comprehensive kit represents a higher initial investment.

Best for:
Owners seeking maximum maintenance interval extension and reliable performance for high-mileage 335i models.

Expert Opinion: For the 335i owner who wants to “set it and forget it” for thousands of miles, the Double Iridium setup is the way to go. Pairing it with new coils makes this a powerhouse reliability upgrade.

A-Premium Iridium Platinum Spark Plugs Compatible with BMW 335i GT xDrive, 335i xDrive, X5, 535i, 535i GT xDrive, 535i xDrive, X3, 435i, 435i Gran Coupe, X1, 740i, 740Li xDrive, X6, 640i

These A-Premium plugs use a powerful combination: an Iridium center electrode paired with a Platinum core. This blend provides the best of both worlds—Iridium’s strength and melting point, combined with Platinum’s stability. Engineered for longevity, these plugs are recommended for replacement intervals between 80,000 to 100,000 miles, making them highly cost-effective over time. Their detailed specifications, including the 0.032-inch gap and 12.00mm thread, confirm compatibility for the later N55 335i models.

Key features that stand out:
– Iridium center electrode/Platinum core hybrid construction for balanced performance.
– Extended replacement intervals (80k–100k miles recommended).
– OE Reference Number 97506 (a widely recognized performance plug number).

Pros:
– Superior longevity minimizes maintenance frequency.
– Reliable spark delivery for modern N55 engines.
– Excellent build quality meeting OEM standards.

Cons:
– May require slight adjustment for heavily tuned 335i models needing tighter gaps.

Best for:
Later model N55 335i owners focused on long service life and high-quality construction.

Expert Opinion: The Iridium/Platinum combination offers a fantastic sweet spot between performance and endurance. These plugs are particularly suited for drivers who use their 335i as a reliable daily driver with moderate tune levels.

BDFHYK Set of 6 Iridium Spark Plug Compatible with BMW X3 X4 X5 X6 135i 335i 435i 535i 640i 740i 740Li M235i ActiveHybrid 3 5 7 3.0L L6 Engine Replacement for 97506 SILZKBR8D8S

BDFHYK provides a set of 6 high-quality Iridium spark plugs designed to directly replace the 97506 SILZKBR8D8S specification—a popular choice for performance applications in the 3.0L L6 engine. These plugs emphasize enhanced ignition performance, resulting in faster and more sensitive ignition jumps and notably improved power delivery. While the recommended economic service life is 30,000–40,000 kilometers (slightly shorter than some premium plugs), they are built using high-density isostatic ceramics for strength and insulation.

Key features that stand out:
– Focus on superior ignition performance and sensitive spark jumps.
– Direct replacement for 97506/SILZKBR8D8S, highly utilized in the N55 platform.
– Iridium electrodes for good ignition and durable ceramic insulators.

Pros:
– Excellent performance potential due to sensitive ignition design.
– Great value for a set of Iridium plugs.
– TS16949 certified manufacturing quality.

Cons:
– Shorter listed service life (30k-40k km) compared to 80k+ mile options.

Best for:
Enthusiasts prioritizing strong ignition and willing to perform plug changes on a shorter maintenance cycle.

Expert Opinion: These are a great affordable performance plug. The fact that they cross-reference the popular 97506 plug means they are built for the higher demands of the turbocharged 335i. Just plan for replacement around the 20k–25k mile mark if you drive aggressively.

Iridium Platinum Spark Plugs 6 Pack 97506 SILZKBR8D8S Compatible with 2011-2018 BMW 135i, 335i, 435i, 535i, 535i GT xDrive, M2, M3, M4, X1, X3, X4, X5, X6, 640i, 740i, 740Li, M235i L6 3.0L

This 6-pack of Iridium Platinum plugs is specifically optimized for the high-performance demands of modern BMW L6 3.0L engines (N55). The design centers around a 0.6mm fine-wire iridium center tip utilizing advanced laser welded technology. This narrow tip design maximizes fuel efficiency and ensures consistent performance. Iridium’s extreme melting point makes it six times harder than platinum, giving this plug exceptional resistance to heat and electrical wear, essential for high boost applications often seen on the 335i.

Key features that stand out:
– 0.6mm fine-wire iridium center tip for maximum efficiency.
– Extreme durability thanks to Iridium alloy’s high melting point.
– Compatible with highly tuned N55/S55 engines (M2, M3, M4).

Pros:
– Designed specifically for today’s high-performance engines.
– Improves fuel efficiency through precise sparking.
– Excellent heat resistance and electrical stability.

Cons:
– Requires the user to confirm the proper gap for highly modified setups.

Best for:
Performance tuners and those running moderate to aggressive tunes (Stage 1 or Stage 2) who need reliable, heat-resistant spark delivery.

Expert Opinion: This plug hits the sweet spot for the modern 335i (N55). The fine-wire iridium is extremely effective at delivering a powerful, consistent spark under high load, which is exactly what a tuned turbo motor demands.

BMW Spark Plugs, Plug Set Laser Platinum NGK OEM 3199 (6pcs)

NGK is often the benchmark for original equipment quality in BMWs, and this Laser Platinum set (NGK 3199) is no exception. These plugs are engineered to deliver the perfect balance of longevity and performance that the OEM manufacturer intended. Platinum plugs offer excellent stability and a long service life under normal operating conditions. If you value OEM reliability and the exact specifications recommended by BMW, this NGK set is a definitive choice.

Key features that stand out:
– Genuine NGK OEM Quality (often supplied as factory plug).
– Laser Platinum construction for long, dependable service life.
– Guaranteed OEM reliability and durability.

Pros:
– Highest assurance of correct fitment and function (OEM).
– Exceptional longevity for stock applications.
– World’s largest supplier of OEM spark plugs—a trusted brand.

Cons:
– Platinum may not handle extreme heat from aggressive tuning as well as Iridium.

Best for:
Owners prioritizing strict factory specifications, dependability, and maximum maintenance intervals on stock 335i engines.

Expert Opinion: When in doubt, go NGK OEM. These plugs offer the utmost confidence in fitment and performance for a stock or lightly modified 335i. They are the definition of reliable maintenance.

Ignition Coil & Spark Plugs Set of 8 Compatible with BMW 135i 135is 335i 435i 535i 640i 740i 740Li M235i X1 X3 X5 X6 3.0L 4.4L Replaces# UF592, 0221504470

While the BMW 335i is a six-cylinder engine (requiring 6 plugs), this kit is designed for multi-platform use and includes a total of 8 ignition coils and plugs, covering both the L6 3.0L and some V8 4.4L applications. The focus here is on improved erosion resistance and maximizing fuel economy. The spark plugs are made of premium aluminum and porcelain, ensuring protection against corrosion and offering great fuel efficiency benefits. This kit is perfect for shops or owners maintaining multiple compatible BMW vehicles.

Key features that stand out:
– Includes 8 coils and 8 plugs (great for V8 owners, extra spares for L6).
– Premium aluminum/porcelain construction for corrosion resistance.
– Designed to maximize fuel economy and reduce tailpipe emissions.

Pros:
– Excellent value if you maintain multiple compatible vehicles.
– Coils are designed to eliminate common misfire issues.
– Exceeds OEM specification standards for durability.

Cons:
– You will end up with two unused coils and plugs if you only own a 335i (L6).

Best for:
Multi-BMW owners or those who want spare coils and plugs on hand for emergency replacements.

Expert Opinion: This is a slightly unique offering. While the 335i only needs six, the quality of the UF592 replacement coils and the performance plugs makes this a decent choice, provided you are okay with having extra spares.

Comparison Insights: Finding the Right Spark Plug Type

When shopping for the best spark plugs for your BMW 335i, you’ll primarily choose between materials: Copper/Nickel, Platinum, and Iridium.

• For the Stock or Lightly Tuned 335i: Stick to OEM-spec plugs like the Bosch ZGR6STE2 or the NGK Laser Platinum 3199 set. These offer exceptional longevity (upwards of 60,000 miles) and are engineered for the factory heat range of the N54/N55 engines.
• For Tuned 335i Engines (Stage 1/2+): You absolutely want Iridium or Iridium/Platinum plugs, such as the A-Premium or the Iridium Platinum 6 Pack (97506 cross-reference). Iridium has a higher melting point and is much more resistant to electrical erosion, which is crucial when running higher boost pressures and demanding a stronger, more consistent spark. These typically require replacement around the 20,000 to 30,000-mile mark, depending on tune and gap.
• Buying Full Kits vs. Plugs Only: If your 335i has over 60,000 miles and you’ve never changed the ignition coils, purchasing a combined coil and plug set (like the Autowxjq or UF592 kits) is the smartest decision. Ignition coil failure is very common in the N54/N55, and replacing them alongside the plugs ensures maximum ignition system reliability.
• Checking the Gap: While many Iridium plugs come pre-gapped, if you are heavily modified (running E85 or a massive turbo), you will likely need to re-gap your performance plugs to a tighter specification (often around 0.022” or 0.025”) to prevent spark blowout under high cylinder pressures. Always check the specific requirements of your tune.

Final Verdict: Our Top Picks for the BMW 335i

Choosing the right plug depends entirely on how you use your car. Here are our top recommendations based on different use cases:

The OEM Workhorse (Best Reliability/Longevity):
If your 335i is mostly stock and you want the least hassle and longest maintenance interval, the BMW Spark Plugs, Plug Set Laser Platinum NGK OEM 3199 (6pcs) is the unbeatable choice. It is the gold standard for factory-spec performance.

The Performance Enthusiast (Best for Tunes):
For owners running aggressive tunes who need superior spark stability under high boost, we recommend the Iridium Platinum Spark Plugs 6 Pack 97506 SILZKBR8D8S. Their fine-wire iridium tip and high heat resistance make them perfect for demanding driving conditions.

The Full Ignition Overhaul (Best Value Kit):
If you need to replace both coils and plugs simultaneously and want high-quality iridium plugs, go with the UF592 Ignition Coil & 12120032137 Double Iridium Spark Plug kit. The double iridium provides exceptional long-term savings by extending the plug change interval significantly.

 Comprehensive FAQs About Best Spark Plugs for BMW 335i

Q1: What is the correct replacement interval for spark plugs on a BMW 335i (N54/N55)?

The replacement interval depends heavily on the type of plug and whether the engine is modified. OEM Platinum plugs usually last between 45,000 and 60,000 miles. However, if you are running a tune (like Stage 1 or Stage 2) or utilizing high-performance Iridium spark plugs, the interval is often reduced to 20,000 to 30,000 miles to ensure optimal ignition timing and prevent misfires under boost.

Q2: Should I choose Iridium or Platinum plugs for my tuned 335i?

For any tuned or performance-driven BMW 335i, Iridium is generally preferred. Iridium has a significantly higher melting point than Platinum, making it more resistant to the extreme heat generated by forced induction and higher cylinder pressures. This resilience helps maintain a stable, powerful spark, preventing “spark blowout” common in turbocharged engines.

Q3: What is the recommended spark plug gap for a stock N54 or N55 engine?

For a stock N54 or N55 engine, the gap specification is typically around 0.030 inches (0.76mm). However, specific OEM plugs may vary slightly (e.g., some specify 0.7mm). Always refer to the plug manufacturer’s specification for the specific OE replacement plug you are using.

Q4: If I install a high-performance tune on my 335i, do I need to re-gap the plugs?

Yes, absolutely. High boost pressures can extinguish the spark, leading to misfires. For performance tunes, it is common practice to tighten the spark plug gap. Tuners often recommend a gap in the range of 0.022 inches to 0.025 inches to ensure the spark can handle the increased cylinder pressure.

Q5: Is it better to buy a spark plug and ignition coil set or just the plugs for the 335i?

If your car has high mileage (over 60,000 miles) and you haven’t replaced the ignition coils, it is highly recommended to purchase a set that includes both the spark plugs and ignition coils (UF592 or similar kits). Ignition coil failure is a notorious issue on the N54 and N55 engines, and replacing them proactively during spark plug service saves future diagnostic headaches and ensures reliable BMW 335i performance.

Q6: Can I use copper spark plugs in my 335i, and what are the drawbacks?

You can technically use copper plugs, such as the Bosch ZGR6STE2, as they have a good heat range for turbo applications. However, copper plugs wear out much faster than Platinum or Iridium plugs. While they are cheaper, you would need to change them far more frequently—potentially as often as every 10,000–15,000 miles—which increases long-term maintenance costs and effort.