Best Spark Plugs For Subaru Impreza: 7 Best Choices

I recently noticed my Impreza’s signature boxer engine wasn’t pulling quite as smoothly on the highway, hinting at a need for fresh ignition components. Choosing the best spark plugs for subaru impreza is crucial for maintaining that distinct performance and fuel efficiency. I’ve spent hours digging into the top options, from OEM replacements to performance iridium, to create a definitive guide so you can find the perfect fit for your specific model year and driving needs.

IMAGE	PRODUCT NAME	AMAZON LINK
	OEM Genuine NGK Spark Plugs Kit for Subaru Impreza…	View on Amazon
	A-Premium Double Iridium Spark Plugs Compatible with Subaru…	View on Amazon
	4 pc NGK Laser Iridium Spark Plugs compatible with Subaru…	View on Amazon
	Genuine OEM Subaru Spark Plugs Forester Impreza Legacy…	View on Amazon
	4 pc NGK Iridium IX Spark Plugs compatible with Subaru…	View on Amazon
	MOAUTO Set of 1 Ignition Coils Pack UF566 22433-AA500 &…	View on Amazon
	A-Premium Iridium Platinum Spark Plugs Compatible with…	View on Amazon

OEM Genuine NGK Spark Plugs Kit for Subaru Impreza Outback Legacy Baja Forester SET OF 4

When maintenance calls, going back to the source is often the safest bet, especially with Subaru’s sensitive boxer engines. This genuine OEM kit provides the exact NGK plugs specified by the manufacturer for a range of older Subaru models, including the classic Impreza 1.8L and 2.2L non-turbo models from the 90s and early 2000s. You get guaranteed fitment and performance tailored specifically for legacy Subaru drivetrains, ensuring smooth idling and reliable combustion exactly as the factory intended.

Key features that stand out:
– Genuine Subaru Spark Plugs 22401AA310 X4: Ensures factory standards and reliability.
– Broad Older Model Fitment: Covers 1993-2004 Subaru Impreza 1.8L, 2.2L, 2.5L-H4 SOHC Non-Turbo models.
– Set of 4: Everything needed for a complete installation right out of the box.

Pros:
– Guaranteed OEM quality and fitment.
– Ideal for restoring factory performance.
– Excellent durability and consistent performance for non-turbo applications.
Cons: Offers standard performance, not designed for high-heat/turbo setups.

Best for: Owners of older (pre-2005) non-turbo Impreza models seeking factory reliability.

Expert Opinion: For older, higher-mileage Subaru engines, sticking with the genuine OEM plug specification is vital. These plugs are designed to handle the specific heat range and compression ratios of the SOHC non-turbo engines, minimizing the risk of misfire or detonation issues common with improperly gapped aftermarket plugs.

A-Premium Double Iridium Spark Plugs Compatible with Subaru Impreza 2017-2020, Crosstrek 2018-2020, 2.0L, Pack of 4

If you own a newer Impreza (2017-2020) and prioritize maximum longevity, these A-Premium Double Iridium plugs are an outstanding choice. Featuring Iridium on both the center electrode and the ground electrode, they resist erosion far better than standard plugs, providing exceptional ignitability and maintaining a clean, strong spark over a massive mileage range. This means fewer changes, making them fantastic for daily drivers who want set-it-and-forget-it maintenance.

Key features that stand out:
– Double Iridium Construction: Offers superior lifespan and wear resistance.
– Extensive Mileage Range: Recommended replacement intervals are 100,000 to 120,000 miles.
– Precise Modern Fitment: Compatible with Impreza 2017-2020 H4 2.0L with 0.032″ pre-set gap.

Pros:
– Industry-leading durability and longevity.
– Reliable ignition performance for modern direct-injection Subaru engines.
– Precision engineering matching OEM specifications.
Cons: Higher initial cost compared to standard platinum or copper plugs.

Best for: Newer Subaru Impreza owners (2017+) looking for the longest possible service life.

Expert Opinion: Double Iridium is the gold standard for maintenance-free operation in modern vehicles. While the gap is specified, always confirm the factory gap upon installation, especially with high-mileage interval plugs, to ensure optimal efficiency in the Impreza’s direct-injection system.

4 pc NGK Laser Iridium Spark Plugs compatible with Subaru Impreza 2.0L H4 2017-2020

NGK is the gold standard in Japanese auto ignition, and the Laser Iridium line is often the true OEM equivalent for many modern Subaru models. This set offers precision-engineered electrodes and a robust design for the latest 2.0L Impreza engines, guaranteeing maximum ignition efficiency and stable idling. If you want the reliability and quality of NGK specifically engineered for the high demands of the 2017-2020 Impreza platform, this is a top-tier choice.

Key features that stand out:
– Genuine NGK Parts: Trusted quality and reliability in the aftermarket.
– Laser Iridium Technology: Provides extreme durability and excellent fouling resistance.
– Direct Replacement: Specifically fits Impreza 2017-2020 2.0L H4 models.

Pros:
– Considered the top aftermarket replacement for many modern Subaru OEMs.
– Exceptional cold-start performance and stable idle.
– High resistance to oxidation and electrical wear.
Cons: The price point reflects the premium NGK quality and specific model fitment.

Best for: Newer Impreza owners (2017-2020) who want NGK-branded OEM equivalent quality.

Expert Opinion: Laser Iridium plugs utilize a unique electrode structure that focuses the spark, which is particularly beneficial for the highly-tuned 2.0L H4 engine. They are often the best spark plugs for subaru impreza in this generation, providing the ideal balance of performance and maintenance interval.

Genuine OEM Subaru Spark Plugs Forester Impreza Legacy Crosstrek 2011-2017 22401AA781 Set OF 4

For those driving the mid-generation Impreza (2012-2016 2.0 non-turbo), securing genuine OEM parts ensures there are zero guesswork involved in your maintenance. This set of four genuine Subaru plugs is specifically calibrated for the non-turbo 2.0L engine used during these years. These plugs maintain the factory heat range and gap settings necessary for peak operational efficiency, protecting the engine from pre-ignition while delivering predictable power and consistent fuel economy.

Key features that stand out:
– Genuine Subaru Part Number 22401AA781 X4: Guarantees exact factory replacement.
– Mid-Generation Fitment: Specifically tailored for 2012-2016 Impreza 2.0 non-turbo.
– Consistent Performance: Provides the reliable power delivery expected from Subaru.

Pros:
– Absolute assurance of compatibility and quality.
– Perfect match for Subaru’s factory recommended maintenance schedule.
– Simple, straightforward installation.
Cons: May not offer the longevity of premium Iridium plugs designed for 100k+ miles.

Best for: Owners of 2012-2016 Impreza models who insist on 100% genuine Subaru components.

Expert Opinion: When dealing with flat-four (boxer) engines, accessing the plugs can be difficult, making it critical to install a high-quality product that will last. Choosing the genuine OEM part, especially for this era of the 2.0L, eliminates any ambiguity regarding heat range or material type.

4 pc NGK Iridium IX Spark Plugs compatible with Subaru Impreza 2.0L H4 2012-2016

If you’re driving a 2012-2016 Impreza but want a performance upgrade over standard OEM plugs, the NGK Iridium IX line is highly regarded. While not as durable as the Laser Iridium (which often uses a platinum ground electrode), the Iridium IX offers superior ignitability and efficiency thanks to its fine wire center electrode. This provides a more consistent, powerful spark, which can translate into slightly improved throttle response and cleaner combustion, making it a great blend of value and mild performance boost.

Key features that stand out:
– Iridium Fine Wire: Promotes maximum spark focusing and efficient combustion.
– Genuine NGK Quality: Reliability and engineering excellence you can trust.
– Performance-Oriented Design: Excellent anti-fouling characteristics and stable spark.

Pros:
– Noticeable improvement in throttle response over worn or standard plugs.
– High durability compared to copper or platinum options.
– More affordable than double Iridium or Laser Iridium lines.
Cons: Longevity is typically around 40,000–50,000 miles, shorter than OEM Iridium equivalents.

Best for: 2012-2016 Impreza owners seeking a mild performance upgrade without the premium price tag.

Expert Opinion: The Iridium IX is often the go-to choice for enthusiasts who perform plug changes more frequently. Its fine wire design ensures a hotter spark, which is helpful for engines prone to carbon build-up or those running slightly richer mixtures.

MOAUTO Set of 1 Ignition Coils Pack UF566 22433-AA500 & 4 PCS Iridium Spark Plugs with Wire Set Compatible with Subaru Outback Forester Impreza Legacy Saab 9-2X – H4 2.5L

Sometimes, a single spark plug replacement isn’t enough—especially if you’re experiencing chronic misfires. This MOAUTO package offers a comprehensive solution by including an ignition coil pack, 4 high-quality iridium spark plugs, a full wire set, and even an ignition coil removal tool. This kit focuses on the 2.5L H4 engines (common in older Impreza and Forester models) and is an exceptional value for performing a full ignition system overhaul, restoring reliability across the board.

Key features that stand out:
– Complete Ignition System Overhaul: Includes coil, plugs, and wires in one package.
– Iridium Spark Plugs: Ensures long-lasting, high-energy ignition.
– High Heat-Resistant Compounds: Designed for durability under engine bay heat.

Pros:
– Outstanding value for money when replacing multiple components.
– Resolves common misfire issues caused by aging coils or wires.
– Includes the necessary removal tool, simplifying the DIY process.
Cons: The included ignition coil and wires may not match the absolute highest tier of OEM durability.

Best for: Owners of older 2.5L H4 Impreza models needing a full, cost-effective ignition system replacement.

Expert Opinion: It’s important to remember that spark plugs are only half the story; if your wires or coil are weak, even the best spark plugs for subaru impreza won’t fix the misfire. This kit provides a prudent, budget-friendly approach to full ignition system maintenance for specific 2.5L applications.

A-Premium Iridium Platinum Spark Plugs Compatible with Subaru Outback, Forester, Impreza, Legacy & Mercedes-Benz C230 & Mitsubishi Outlander, Lancer, Eclipse & Hyundai Genesis Coupe, Pack of 4

This A-Premium set provides a high-quality alternative for a massive range of Impreza models, specifically covering the 2.5L models from 2004-2014, including WRX/WRX STI turbo applications from 2013-2018. These plugs use a durable Iridium center electrode combined with a Platinum ground electrode, offering excellent longevity (80,000 to 100,000 miles) and robust performance for both naturally aspirated and mild turbo applications. They offer high heat stability and exceptional ignitability, perfect for drivers needing broad compatibility and consistent reliability.

Key features that stand out:
– Iridium/Platinum Hybrid: Excellent balance of durability and efficient sparking.
– Broad Subaru 2.5L Fitment: Covers Impreza, Forester, Legacy, and even some WRX models in specific years.
– High Heat Resistance: Engineered for optimal engine performance and longevity under demanding conditions.

Pros:
– Versatile plug suitable for both NA and turbo Impreza models (check exact fitment).
– Excellent service interval between changes.
– Strong performance designed alongside OEM standards.
Cons: Gap size may need careful checking depending on specific turbo or non-turbo application (0.030/0.032).

Best for: Owners of 2.5L Impreza models (including older WRX) seeking long-lasting, reliable platinum iridium performance.

Expert Opinion: The choice between Platinum and Iridium is often about lifespan. This Iridium Platinum combination provides superior erosion resistance over a standard copper plug, making it a reliable choice for the demanding heat cycles of Subaru’s 2.5L boxer engines across various platforms.

Comparison and Buying Insights

Choosing the best spark plugs for subaru impreza requires matching the electrode material to your driving style and engine type (turbo vs. non-turbo).

For those with newer Imprezas (2017+), the best choices are the A-Premium Double Iridium or the NGK Laser Iridium. Both provide 100,000+ miles of reliable service, but the NGK Laser Iridium holds a slight edge if you are looking for the absolute closest match to factory premium parts.

If you drive an older non-turbo Impreza (SOHC 2.5L or 2.0L), the choice is between the Genuine OEM kits (for guaranteed factory spec) or the MOAUTO Set. The MOAUTO Set is unbeatable if you suspect issues with coils or wires, providing a full system overhaul for excellent value.

When seeking a performance boost and quicker throttle response, the NGK Iridium IX is a fantastic hybrid option for the 2012–2016 2.0L Impreza, though you sacrifice some longevity compared to the premium double iridium options.

Finally, remember that gap checking is non-negotiable, especially for non-OEM plugs. While many iridium plugs come pre-gapped, the jarring nature of shipping can sometimes alter this critical measurement. Always verify the gap setting specified in your owner’s manual before installation.

Final Verdict: Our Top Picks by Subaru Impreza Model

If you’re still on the fence about the best spark plugs for your Subaru Impreza, here are three tailored recommendations:

1. Top Pick for Modern Longevity (2017+ 2.0L): We recommend the A-Premium Double Iridium Spark Plugs. Their robust double iridium construction delivers a service life exceeding 100,000 miles, providing exceptional peace of mind and reducing maintenance frequency—a huge win given the difficulty of accessing Subaru plugs.

2. Top Pick for OEM Reliability (Legacy Models): The OEM Genuine NGK Spark Plugs Kit is the hands-down winner for older 1.8L and 2.2L models. When maintaining an aging engine, using the exact parts it was designed for ensures optimum operation, prevents pinging, and guarantees proper heat dissipation.

3. Top Pick for Full System Value: For 2.5L owners dealing with age-related misfires, the MOAUTO Set of 1 Ignition Coils Pack & Iridium Spark Plugs with Wire Set is the most practical solution. You refresh the entire ignition path for less than the cost of some individual coils, restoring power and eliminating common failure points.

Best Spark Plugs For Subaru Impreza FAQ

Q: How often should I replace the spark plugs in my Subaru Impreza?

A: The replacement interval depends heavily on the spark plug material. Standard copper plugs should be changed every 30,000 miles. Premium Iridium or Platinum plugs (like those from NGK Laser or A-Premium) are typically rated for 80,000 to 120,000 miles. Always consult your Impreza’s owner manual, especially if you have a turbo model, as they often require plugs to be changed more frequently due to higher heat and pressure.

Q: What is the difference between Iridium, Platinum, and Copper spark plugs?

A: This relates to the electrode material and its durability. Copper is cheap and conductive but wears quickly. Platinum offers moderate lifespan (around 60,000 miles). Iridium is the strongest and most durable metal, allowing for a finer center electrode which improves ignitability and drastically extends the plug’s lifespan to over 100,000 miles. Most modern Subarus use Iridium plugs from the factory.

Q: Does the spark plug gap size matter on a Subaru boxer engine?

A: Yes, absolutely. Proper gap size is critical for efficient combustion. If the gap is too wide, the spark may be weak or fail completely, leading to misfires. If it’s too narrow, the spark may be unstable. Always verify the gap specified for your exact Impreza model year and engine (e.g., 2.0L vs. 2.5L turbo) and adjust non-pre-gapped plugs before installation.

Q: Can I use performance spark plugs (like Iridium IX) in my non-turbo Impreza?

A: Yes, performance plugs like the NGK Iridium IX are generally safe and beneficial for non-turbo Impreza models. They offer a more intense, focused spark, which can lead to better idle stability and cleaner combustion. However, ensure the heat range matches the factory specification, as using a plug that is too “cold” can cause plug fouling in a street-driven, naturally aspirated engine.

Q: Are genuine OEM spark plugs always the best spark plugs for subaru impreza?

A: OEM plugs (often manufactured by NGK or Denso for Subaru) guarantee perfect compatibility and the correct heat range, making them an excellent, safe choice. However, many premium aftermarket plugs (like Double Iridium) offer equal or superior longevity and ignitability compared to the standard OEM part, often exceeding the factory plug’s lifespan rating.

Q: Why do Subarus seem more difficult to change spark plugs on than other cars?

A: The difficulty stems from the design of the boxer engine (flat-four configuration). The horizontal position of the cylinders means the spark plugs are nestled deep within the engine bay, close to the frame rails, making access and wrench manipulation challenging compared to a traditional inline or V-configuration engine. This is why investing in durable, long-life plugs is wise to minimize replacement frequency.