Are you in search of the best spark plugs for your Subaru Forester? If yes, you have come to the right place. Spark plugs play a crucial role in ensuring your vehicle runs smoothly and efficiently. However, choosing the right spark plugs can be overwhelming, given the plethora of options available in the market.
To help you make an informed decision, we have compiled a short guide that outlines five key points to consider when looking for the best spark plugs for your Subaru Forester. Firstly, you need to determine the type of spark plugs that are compatible with your vehicle's make and model. Secondly, consider the material used to make the spark plugs, as this will affect their durability and performance. Thirdly, check the spark plugs' heat range, which determines their ability to dissipate heat. Fourthly, look for spark plugs with a good electrode design, as this will impact their ignition ability and fuel economy. Lastly, consider the price of the spark plugs, as this will impact your budget.
In conclusion, choosing the best spark plugs for your Subaru Forester requires careful consideration of several factors. By following our guide's key points, you can select the best spark plugs that will ensure your vehicle runs smoothly and efficiently for years to come.
10 Best Spark Plugs For Subaru Forester
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1. Oem Set Of 4 Genuine Subaru Iridium Spark Plugs (22401aa670/silfr6a) For Wrx, Sti, Legacy, Forester, And Outback.

The Genuine Subaru Iridium Spark Plugs 22401AA670 / SILFR6A are an OEM set of four spark plugs that are designed to fit a range of Subaru models, including the WRX, STi, Legacy, Forester, Outback, and Impreza. These spark plugs are made by NGK, a trusted manufacturer of automotive spark plugs, and are designed to offer high performance and durability.
The NGK Laser Iridium Resistor spark plugs are designed with advanced technology that delivers consistent spark, efficient combustion, and longer service life. The iridium center electrode is much smaller than standard electrodes, which allows for more efficient combustion and better fuel economy. The laser-welded, platinum-tipped ground electrode also ensures longer service life and better durability.
The Subaru Part Number for these spark plugs is 22401AA670, and the NGK Part Number is SILFR6A / 7913. These spark plugs are a direct replacement for the original spark plugs that came with your Subaru vehicle, and they are designed to meet or exceed OEM specifications.
The Genuine Subaru Iridium Spark Plugs are compatible with a range of Subaru models, including the Forester (2004-2013), Impreza (2004-2014), Legacy (2005-2013), Outback (2005-2009), Tribeca (2008-2009), WRX (2012-2016), and WRX STi (2013-2019) with 2.5 Turbo Engines Only. These spark plugs are specifically designed to work with the Subaru ignition system and provide reliable performance in all driving conditions.
Replacing your spark plugs with Genuine Subaru Iridium Spark Plugs can have a significant impact on the performance and efficiency of your vehicle. These spark plugs are designed to provide greater fuel efficiency, smoother acceleration, and better overall performance. They are also designed to last longer than standard spark plugs, which can help you save money on future maintenance costs.
In summary, the Genuine Subaru Iridium Spark Plugs 22401AA670 / SILFR6A are an OEM set of four spark plugs that are designed to fit a range of Subaru models. These spark plugs are made by NGK and are designed to offer high performance and durability. They are compatible with a range of Subaru models and are a direct replacement for the original spark plugs. Replacing your spark plugs with Genuine Subaru Iridium Spark Plugs can have a significant impact on the performance and efficiency of your vehicle, and they are designed to provide greater fuel efficiency, smoother acceleration, and better overall performance.
2. Mck 4pcs Ignition Coil Pack With Iridium Spark Plug For Subaru 2.5l H4 (04-10)

The MCK 4pcs Ignition Coil Pack and Iridium Spark Plug is a reliable solution to improve the performance of your Subaru Baja Forester Impreza Legacy Outback from 2004 to 2010, with a 2.5L 2.5 H4 engine. If you are experiencing difficulty starting your car, long crank time, misfires, high fuel consumption, engine vibration, check engine light, and other problems, consider upgrading your ignition coil and spark plugs to improve your driving experience.
The MCK ignition coil pack is built to last, with excellent heat resistance, corrosion protection, and better durability. With this product, you won't need to worry about replacing parts anytime soon, and you can expect better quality, performance, and lower fuel costs. The MCK ignition coil pack provides exceptional acceleration, fuel efficiency, and durability, giving you a smoother ride.
Installation is made easy with the MCK ignition coil pack. You can skip the garage and save yourself time and money by installing it yourself. A seamless installation will spark new life into your car, and you can experience more consistent, smooth engine starts right away.
Before purchasing the MCK ignition coil pack, please check the description or use the year/make/model drop-down bar and interchangeable part numbers to confirm compatibility with your vehicle. Select your car's year, make, and model to ensure the correct fit. This product is compatible with UF508 UF-508 22433-AA460 22433-AA640 22433-AA480 22433-AA540.
In summary, the MCK 4pcs Ignition Coil Pack and Iridium Spark Plug is a reliable, durable, and easy-to-install solution to improve the performance of your Subaru Baja Forester Impreza Legacy Outback from 2004 to 2010. Upgrade your ignition coil and spark plugs to experience a smoother ride, better quality, performance, and lower fuel costs.
3. 4-Pack Ngk Laser Iridium Spark Plugs Silzkar7b11 For 2014-2015 Subaru Forester 2.5i 2.5l/2498cc.

The NGK Laser Iridium Spark Plug SILZKAR7B11 (4 Pack) is the perfect replacement for your SUBARU FORESTER 2.5I 2014-2015 2.5L/2498cc engine. This spark plug is designed to meet the high-performance demands of your vehicle, thanks to its advanced features and superior construction.
At the core of this spark plug is a trivalent metal plating that provides exceptional anti-corrosion and anti-seizing properties. This coating helps to prevent rust and other forms of corrosion, ensuring that your spark plug remains in top condition for a long time. The trivalent metal plating also prevents the spark plug from seizing, which can be a major issue in high-performance engines.
Another key feature of the NGK Laser Iridium Spark Plug SILZKAR7B11 is its corrugated ribs, which prevent flashover. Flashover occurs when the spark jumps from the electrode to the metal shell, rather than igniting the fuel mixture in the engine. This can cause misfires and other issues. The corrugated ribs of this spark plug help to prevent flashover, ensuring that your engine runs smoothly and efficiently.
The NGK Laser Iridium Spark Plug SILZKAR7B11 also features a pure alumina silicate ceramic insulator, which provides superior strength and better heat transfer. The ceramic insulator is able to withstand extreme temperatures and pressure, which is essential in high-performance engines. The superior heat transfer of the ceramic insulator helps to keep the spark plug cool, which in turn helps to prevent pre-ignition and detonation.
In addition, the NGK Laser Iridium Spark Plug SILZKAR7B11 has a copper core that aids in heat removal. Copper is an excellent conductor of heat, which means that it helps to dissipate heat away from the spark plug. This is important because excess heat can cause the spark plug to fail prematurely, which can lead to engine damage.
Finally, the NGK Laser Iridium Spark Plug SILZKAR7B11 has triple seals that prevent leakage. These seals ensure that the spark plug stays securely in place and that no oil or other fluids leak into the combustion chamber. This helps to improve engine performance and longevity.
The NGK Laser Iridium Spark Plug SILZKAR7B11 is sold in a convenient 4-pack, making it easy to replace all of the spark plugs in your engine. With its advanced features and superior construction, this spark plug is the perfect choice for anyone looking to improve the performance and reliability of their SUBARU FORESTER 2.5I 2014-2015 2.5L/2498cc engine.
4. Mck 4pc Ignition Coil + Iridium Spark Plug For Subaru 2.5l H4 Uf508 (04-09)

The MCK 4pcs Ignition Coil Pack and Iridium Spark Plug is a reliable and high-quality product that is compatible with Subaru Baja Forester Impreza Legacy Outback models from 2004 to 2009. If your car is experiencing difficulty starting, long crank time, misfires, high fuel consumption, engine vibration, check engine light, and other problems, then this ignition coil pack is the solution you need to get your car running like new again.
This ignition coil pack is made with top-notch materials that offer excellent heat resistance, corrosion protection, and better durability. You won't need to worry about replacing parts anytime soon, and you'll save on fuel costs thanks to the better quality and performance. With this product, you can expect a smoother ride, exceptional acceleration, fuel-efficiency, and durability.
What's even better is that installation is effortless, meaning you can skip the garage and save yourself time and money. With a seamless installation, this ignition coil pack will spark new life into your car, and you can experience more consistent, smooth engine starts right away.
Before purchasing this product, it's important to confirm that it's compatible with your vehicle. You can check the description, use the year/make/model drop-down bar, or interchangeable part numbers. This ignition coil pack is compatible with UF508 UF-508 22433-AA460 22433-AA640 22433-AA480 22433-AA540.
In summary, the MCK 4pcs Ignition Coil Pack and Iridium Spark Plug is a high-quality product that offers a smoother ride, exceptional acceleration, fuel-efficiency, and durability. It's made with top-notch materials that offer excellent heat resistance, corrosion protection, and better durability. Installation is effortless, and it's compatible with Subaru Baja Forester Impreza Legacy Outback models from 2004 to 2009.
5. 4 Ena Ignition Coils And Spark Plugs For Subaru Forester 2.5l H4, Uf664 Replacement

The ENA Set of 4 Ignition Coil with 4 Spark Plug is a reliable and high-quality replacement for the original equipment in Subaru Forester 2.5L H4 engines. Designed and manufactured to operate flawlessly under all conditions, this set of ignition coils and spark plugs is engineered to provide optimal performance and durability.
With easy and quick installation, this product is an ideal replacement for those who want to get their Subaru Forester back on the road as soon as possible. However, before purchasing, it is important to ensure compatibility with your vehicle. Therefore, it is recommended to use the Amazon Confirmed Fit function and enter your vehicle information to ensure correct compatibility.
The ENA Set of 4 Ignition Coil with 4 Spark Plug is a great option for those who are looking for a reliable replacement for their worn-out or damaged ignition coil and spark plugs. This product is engineered to meet or exceed OEM quality standards, ensuring that it will provide reliable performance for years to come.
Furthermore, this set of ignition coils and spark plugs is designed to operate reliably under all conditions, regardless of weather or driving conditions. This means that you can depend on your Subaru Forester to start smoothly and run efficiently, no matter what.
Finally, the ENA Set of 4 Ignition Coil with 4 Spark Plug comes with a 1-year limited warranty, which provides peace of mind and protection against any defects or malfunctions. With this product, you can rest assured that you are getting a high-quality replacement that will provide reliable performance and durability.
6. 4 Pack Ngk Laser Iridium Spark Plug Silzkar7b11 For Subaru Forester 2.5i Touring 2016-2018 2.5l/2498cc.

The NGK Laser Iridium Spark Plug SILZKAR7B11 (4 Pack) is a high-quality spark plug that is specifically designed to be compatible with the SUBARU FORESTER 2.5I TOURING 2016-2018 model with an engine size of 2.5L/2498cc. This product is engineered to provide superior performance, durability, and reliability, making it an excellent choice for car owners who want to maintain the optimal performance of their vehicles.
This spark plug features a trivalent metal plating that provides exceptional anti-corrosion and anti-seizing properties, ensuring that it will last longer and perform better than other spark plugs on the market. Additionally, the corrugated ribs of the NGK Laser Iridium Spark Plug SILZKAR7B11 prevent flashover, which can cause misfires and reduce engine performance.
One of the key features of this spark plug is its pure alumina silicate ceramic insulator, which provides superior strength and better heat transfer. This means that the spark plug will be able to withstand high temperatures and operate effectively even in extreme conditions. The copper core of the NGK Laser Iridium Spark Plug SILZKAR7B11 also aids in heat removal, ensuring that the spark plug will not overheat and cause damage to the engine.
To prevent leakage, the NGK Laser Iridium Spark Plug SILZKAR7B11 is triple-sealed, ensuring that it will remain securely in place and not cause any problems. The product is sold in a pack of four, making it convenient and cost-effective for car owners to replace all their spark plugs at once.
Overall, the NGK Laser Iridium Spark Plug SILZKAR7B11 (4 Pack) is an excellent choice for car owners who want to maintain the optimal performance of their SUBARU FORESTER 2.5I TOURING 2016-2018 model. With its superior anti-corrosion and anti-seizing properties, corrugated ribs, pure alumina silicate ceramic insulator, copper core, and triple-sealed design, this spark plug provides exceptional performance and durability that will last for years to come.
7. Ngk (55004) Rc-Fx101 Spark Plug Wire Set

The NGK (55004) RC-FX101 Spark Plug Wire Set is a premium product that delivers excellent performance and reliability. This set includes four wires, each designed to provide a powerful spark and outstanding EMI/RFI noise suppression. The coil lead is not included in this set.
One of the key features of this wire set is its variable pitch winding, which delivers ultra-low resistance. This feature ensures that the spark is strong and consistent, even in the most challenging conditions. As a result, the engine runs smoothly and efficiently, with improved fuel economy and reduced emissions.
The wires are numbered for easy cylinder identification, and the coil wires are color-coded for correct and easy installation. This makes it easy for even novice mechanics to install these wires correctly, without the risk of damaging the engine or the wires themselves.
The NGK (55004) RC-FX101 Spark Plug Wire Set also features positive-locking, corrosion-resistant stainless steel terminal ends. These ends ensure a tight fit and maximum resistance to vibration and separation, even in the most demanding conditions. This means that the wires will stay securely in place, without the risk of coming loose or causing damage to the engine.
Finally, the high-temp (250°+ C / 482°+ F) silicone outer jacket of these wires resists moisture, oil/petrol, and cracking due to temperature extremes. This makes them ideal for use in all kinds of weather conditions and environments, from the coldest winter days to the hottest summer afternoons.
In summary, the NGK (55004) RC-FX101 Spark Plug Wire Set is an excellent choice for anyone looking for a high-quality wire set that delivers excellent performance and reliability. With its variable pitch winding, numbered and color-coded wires, positive-locking terminal ends, and high-temp silicone outer jacket, this wire set will help ensure that your engine runs smoothly and efficiently, day after day.
8. Ngk (8691) Rc-Fx58 Spark Plug Wire Set

The NGK (8691) RC-FX58 Spark Plug Wire Set is a high-quality, reliable product designed to deliver an exceptional performance. The set includes four wires, each featuring a coil lead N/R.
The variable pitch winding of these wires ensures ultra-low resistance, which in turn generates a powerful spark and minimizes EMI/RFI noise suppression. This feature makes the NGK (8691) RC-FX58 Spark Plug Wire Set an ideal choice for those who demand the best in terms of engine performance and reliability.
The wires are numbered for easy cylinder identification, and their color coding ensures correct and easy installation. This feature eliminates the risk of confusion during installation and reduces the likelihood of mistakes that could lead to poor engine performance.
The positive-locking stainless steel terminal ends of the NGK (8691) RC-FX58 Spark Plug Wire Set are corrosion-resistant and provide a tight fit that maximizes resistance to vibration and separation. This feature ensures that the wires remain securely in place and maintain optimal contact with the spark plugs, even in harsh conditions.
Furthermore, the high-temp silicone outer jacket of these wires resists moisture, oil/petrol, and cracking due to temperature extremes. This feature makes the NGK (8691) RC-FX58 Spark Plug Wire Set a durable and long-lasting choice that can withstand the toughest operating conditions.
In conclusion, the NGK (8691) RC-FX58 Spark Plug Wire Set is a high-quality, dependable product that delivers exceptional performance and reliability. Its variable pitch winding, color coding, positive-locking terminal ends, and high-temp silicone outer jacket make it an ideal choice for those who demand the best in terms of engine performance and durability.
9. Garage-Pro Ignition Coil Set For Subaru Vehicles 1999-2004 With Spark Plug Wire.

The Garage-Pro Ignition Coil SET is an aftermarket replacement compatible with several Subaru models from 1999 to 2004. It fits the Subaru Forester, Outback, Legacy, Impreza, and Baja, making it a versatile option for those looking to replace their ignition coils. The kit includes one ignition coil and four spark plug wires, providing a complete solution for ignition issues.
The set has several features that make it an excellent choice for Subaru owners. It is a direct fit, meaning that it is designed to fit perfectly and work seamlessly with the vehicle's existing systems. This feature reduces the installation time and ensures that the ignition coil is installed correctly.
In addition, the Garage-Pro Ignition Coil SET is a set of two, providing an extra layer of convenience for those who need to replace both ignition coils. This feature also ensures that both coils are matching and compatible with each other, reducing the risk of issues down the line.
The Garage-Pro Ignition Coil SET's interchange part numbers are UF240 and 22433AA570. It replaces the OE number 22433AA570, ensuring that the replacement part is of the same quality and specifications as the original part. This feature also ensures that the ignition coil is a reliable replacement option for those experiencing ignition issues.
Furthermore, the Garage-Pro Ignition Coil SET comes with a one-year warranty when purchased through Auto Parts Giant. This warranty gives customers peace of mind, knowing that they are covered in case of any defects or issues with the product.
In summary, the Garage-Pro Ignition Coil SET is a reliable aftermarket replacement option for those experiencing ignition issues in their Subaru vehicles. Its direct fit, set of two, interchange part numbers, and warranty make it a convenient and dependable choice for Subaru owners.
Best Spark Plugs For Subaru Forester FAQs
Are there any specific spark plugs that work best with the Subaru Forester's engine?
It is essential to use the recommended spark plug for the Forester's engine to ensure optimal performance and prevent damage to the engine. Using a different type of spark plug may cause misfires, reduced fuel efficiency, and other issues. Therefore, it is always advisable to follow the manufacturer's recommendation when it comes to spark plugs and other engine components.
Can upgrading to high-performance spark plugs improve the Subaru Forester's overall performance?
Upgrading to high-performance spark plugs can potentially improve the overall performance of a Subaru Forester. High-performance spark plugs are designed to ignite the fuel mixture more efficiently, resulting in improved throttle response, acceleration, and fuel economy. The improved spark plug design can also enhance the engine's combustion process, resulting in increased horsepower and torque output. However, it's worth noting that the improvement in performance may not be significant, especially if the vehicle already has well-maintained spark plugs. Furthermore, upgrading to high-performance spark plugs may not be necessary if the vehicle is not modified or used for racing purposes. In summary, upgrading to high-performance spark plugs can potentially enhance the Subaru Forester's overall performance but may not be a significant improvement and may not be necessary for all vehicles.
What are the key factors to consider when selecting the best spark plugs for a Subaru Forester?
When selecting the best spark plugs for a Subaru Forester, the following key factors should be considered:
1. Compatibility – Ensure that the spark plugs are compatible with the make and model of the Subaru Forester.
2. Material – Choose spark plugs made from high-quality materials such as iridium or platinum to ensure durability and longevity.
3. Heat range – Select spark plugs with the correct heat range to ensure optimal performance and prevent overheating.
4. Electrode design – Choose spark plugs with a design that allows for efficient combustion and reduces emissions.
5. Brand reliability – Select spark plugs from reputable brands with a track record of producing high-quality products.
6. Maintenance requirements – Consider the maintenance requirements of the spark plugs and choose ones that are easy to install and maintain.
By considering these key factors, you can select the best spark plugs for your Subaru Forester that will provide optimal performance, efficiency, and durability.
What are the top-rated spark plugs for a Subaru Forester?
When it comes to choosing the best spark plugs for your Subaru Forester, there are several options to consider. Based on expert reviews and customer feedback, some of the top-rated spark plugs for this vehicle include NGK Iridium IX, Denso Platinum TT, and Bosch Platinum+4.
NGK Iridium IX is a popular choice as it offers better performance, fuel efficiency, and longer life span. Denso Platinum TT features a twin-tip design that enhances fuel efficiency and reduces emissions. Bosch Platinum+4 offers four ground electrodes that provide better ignition and smoother acceleration.
Other options that have received positive reviews include ACDelco Professional Iridium, Champion Double Platinum, and Autolite Platinum. It's important to choose the right spark plugs that match your driving style and vehicle specifications. Consider factors such as the type of engine, mileage, and maintenance schedule when making your choice.
What is the recommended interval for changing spark plugs in a Subaru Forester?
The recommended interval for changing spark plugs in a Subaru Forester is typically every 60,000 miles or every 5 years, whichever comes first. However, it's important to note that this interval can vary depending on driving conditions and the type of spark plugs being used.
If the vehicle is driven in severe conditions such as frequent stop-and-go traffic or dusty environments, it may be necessary to change the spark plugs more frequently. Additionally, using high-performance spark plugs may require more frequent replacements.
Regularly changing the spark plugs is important for maintaining the performance and fuel efficiency of your Subaru Forester. Worn or dirty spark plugs can lead to misfires, reduced power, and decreased fuel economy. It's recommended to consult your owner's manual or a trusted mechanic to determine the optimal interval for spark plug changes based on your specific driving habits and vehicle.