Best Spark Plugs for Subaru Outback, Legacy, Impreza

A spark plug creates good ignition and helps to reduce gas leakage in a car. But, having a low-quality spark plug may lead you to a challenging start. So, make sure that you choose the best sparks for powering up your engine.

Best Spark Plugs For Subaru Outback

The important thing is, quick spark plug replacement can turn the table around for your car. Are you interested to know more about the concept? Then you have come to the right place.

Because, here we will discuss some best spark plugs for the Subaru Outback, their outstanding features, and drawbacks. So, let’s dig in.

NGK SILZKAR7B11 Laser Iridium Spark Plug
  • Laser-covered iridium center Insulator
  • nose hinders fouling
  • Excellent acceleration
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NGK (7092-4PK) G-Power Spark Plug
  • The facility of anti-seize
  • Having core electrode
  • Comes at a better price
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NGK (7913) SILFR6A Spark Plug
  • Consisting oxygen sensors
  • Ignition coils
  • Provides better fuel execution
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Bosch Automotive 9603 Double Iridium OE Replacement Spark Plug
  • The firing pin of extra iridium
  • Low-gapped fine wire
  • Center-based electrode
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NGK 5464-4PK Iridium IX Spark Plug
  • Anti-fouling equipmentIridium alloy
  • with a better melting point
  • Developed throttle effect
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NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix)
  • Requires less periodic maintenance
  • Higher temperatures increase its vulnerability
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NGK 7090 G-Power Platinum Spark Plugs BKR5EGP
  • Boosts the power of your car’s engine
  • Manufactured from a light material
  • Does not have greater materials
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Our Recommended Top 7 Best Spark Plugs for Subaru Outback Reviews in 2022

#1. NGK SILZKAR7B11 Laser Spark Plug

Are you looking for the actual spark plugs to fit in your Subaru? Then NGK SILZKAR7B11 plugs can be worth your choice. These spark plugs will fit roughly in any Subaru models from 2013 to 2017. Hence, you can buy this spark plug to get maximum results without any doubt.

NGK SILZKAR7B11 Laser Iridium Spark Plug

The minor tip diameter with Iridium surfaces provides a slow wear rate. By using these iridium plugs, you can save your care from fouling and enhance fuel efficiency.

Key Features

Smoother Acceleration and Idle:

The best part about this spark plug is it delivers excellent acceleration and quick starts. Moreover, its Iridium has a high melting point. As a result, the spark plug can resist heat and electrical wear with this fantastic feature, which is ideal for extreme dynamic engines.


There is no doubt that you will have a better experience of fuel economy from the NGK spark plugs. They also offer trivalent metal plating for anti-corrosion and anti-seizing properties. And we know, anti-corrosion properties protect cars from misfiring.  


The core of the NGK ILZKR7B11 spark plug is made of Iridium, and the top is platinum.

Projected Insulator Tip:

A more extended insulator tip feature helps to inhibit fouling. And the iridium-centered electrode tip here assures a long-lasting performance as well.

Spark Gaps:

The pre-gapped option ensures a slow wear rate. In addition, it has a – 1.1mm spark gap.

Performance booster:

Here, the corrugated ribs will protect your car from flashover. And the triple gasket seal will help to reduce combustion gas leakage.


A platinum disc that is welded to the backside of the ground electrode gives high durability.

Therefore, your car will get excellent ignitability and long service life with these laser spark plugs.


  • It helps in lower emissions of gas.
  • It provides superior ignitability
  • Slow wear rate aids to stable idle.
  • It increases the amount of fuel efficiency.


  • Expensive from copper.

#2. NGK 7092 G-Power Spark Plug

NGK (7092-4PK) G-Power Spark Plug

These spark plugs are suitable for the older Subaru Forester 2000-2003 model. You can also fit them with Subaru Outback and Legacy since it contains anti-seize properties.

Key Features

Smoother Acceleration and Idle:

Your car will get improved acceleration and performance by using this spark plug. In addition, it can increase fuel consumption by fastening the power of engines and increasing the pedal speed.


G-Power spark plugs ensure improved fuel efficiency. Also, it provides lower emissions and quicker starts. If you have this plugin in your car, the performance will not be an issue for you.


The core material of the spark plug is copper, and the tip is platinum. This combination of copper and platinum makes the vehicle anti-collision. And the metals here will make your car strong and help not get damaged in a fire hazard.

Projected Insulator Tip:

The platinum spark plug comes with a center electrode, and a 0.6mm laser welded fine Platinum tip. These accessories help to decrease the voltage needed and run cars smoothly.

Spark Gaps:

You will find 0.040 spark gaps in this product. Also, the platinum alloy ground and center electrodes here will help you get accurate gaps throughout the plug.

Performance booster:

G-power plugs provide long-lasting performance and a stable spark. And its insulator noses help to improve throttle response. And the great thing is it will give you enhanced protection from fouling. Additionally, with corrugated ribs on the insulator, these spark plugs prevent flashover.


Trivalent Metal Plating acts as corrosion-resistant and seizing-resistant. Besides, the triple gasket seal helps by eliminating combustion gas leakage. As a result, the environment-friendly spark plug can be everyone’s preference.


  • Insulator noses enhance throttle response
  • Corrugated ribs for preventing flashover
  • Can decrease gas emissions.
  • It provides improved fuel efficiency.


  • Gaps may need to adjust for some models.
  • Experts are needed for installation.

#3. NGK-7913 SILFR6A Spark Plug

NGK (7913) SILFR6A Spark Plug

The NGK product is one of the best spark plugs by its innovation, performance. For ensuring high-quality spark plugs, they work with auto manufacturers.

This Iridium 7913 spark plug can replace DENSO IKH20TT, DENSO PKH20TT, Subaru 22401AA670.

It is the OEM for:

• 2005-2009 Legacy 2.5i, 3.0 R & Legacy GT

• 2005-2009 Outback 2.5, 3.0 & XT

• 2009-2013 Forester X

• 2009-2013 Impreza 2.5, WRX and STI

Key Features:

Top Durability

The core of these spark plugs is Iridium, and its top material is platinum.

Performance Booster:

This spark plug boosts performance by lowering emissions. In addition, it enables impressive fuel economy so that your engine works best. Since we all thrive on durability, this plug can be a better choice for that. That is because the shell of this product prevents corrosion and enhances durable sparking capabilities.


The center and ground electrodes improve spark focus for preventing misfires. This spark plug is six times more rigid than a platinum spark plug. It helps to decrease the cottage need.


This spark plug features center and ground electrodes to create efficient combustion. Iridium gives your car extreme ignitability as well as enhances throttle response. This plug also works as fouling-resistant.

Spark Gaps:

The corrosion-resistant option eliminates spark gap growth and improves spark efficiency. It offers a 0.8-0.9mm spark gap for cars and a 0.7-0.8mm spark gap for motorcycles.

Smoother Acceleration And Idle:

NGK 7913 comes with a 0.6-millimeter laser welded Iridium tip. This tip features high durability and a stable spark.

It also has a tapered ground electrode. As a result, you will get a decreasing electrical quenching effect.

Projected Insulator Tip:

The Insulator nose is long enough to prevent fouling. And the corrugated ribs attached here will protect your car from flashover. Moreover, the actual handy for you will be the triple gasket seal, which reduces gas leakage.


  • Trivalent metal plating protects from corrosion
  • Longer insulator provides anti-fouling property
  •  Protects your car from misfiring.
  • It ensures high combustion efficiency.


  • Experts are needed for installation
  • need anti-seize threads

#4. Bosch Automotive 9603 Double Iridium Spark Plug

Bosch Automotive 9603 Double Iridium Spark Plug

An OE replacement spark plugs ensure four times longer service than any standard spark plug. These plugs deliver both high performance and long life.

It has a 700° melting point which ensures the performance of any vehicle. In addition, this iridium spark plug comes with fine electrodes. So, be ready to have excellent wear characteristics and usage from here.

Bosch comes with ultra-fine wire technology. In addition, the laser-welded tapered ground electrode features the best performance.

Bosch Automotive 9603 Spark Plug is the best for Subaru. And the reasons why it is much preferable are-

  • The 360-degree ultrasonic process enhances flexibility.
  • The copper-core offers a high melting point.
  • This spark plug provides resistance to fouling.
  • Also, the central electrode provides overall system management.
  • The anti-collision feature protects your car from exploding.
  • Ultra-fine wire ensures 24% less voltage for spark.

Key Features

Smoother Acceleration And Idle:

The spark plug comes with a 0.6-millimeter Iridium tip that creates a continuous spark. And the tip of it is highly durable. But it looks like a stable plug.


Corrosion-resistant iridium firing pin helps to improve efficiency. And here, the electrode performs better in lowering the results of electrical saturation.

Also, there is a tapered ground electrode that helps to decrease the electrical quenching effect.

There is a 360-degree continuous laser welding that extends the life of the spark. This option is a great alternative to fuse the iridium firing pin. What’s more, is the iridium center electrode and ground electrode enable the cars to go the distance smoothly.


A double iridium spark plug is eight times stronger than platinum spark plugs. Again, the center electrode tip of the Bosch spark plugs is made with standard Iridium material. At the same time, the center electrode core is Nickel or Copper material.

The copper core ground electrode helps to send heat. And the nickel-plated shells work great without anti-seize properties with rolled threads. One pleasing thing is the wire firing pin of the spark plug doesn’t require any excess voltage.

Projected Insulator Tip:

These spark plugs come with ribbed insulator technology. Thus, your car will always remain protected from flashovers.

Spark Gaps:

There is original equipment, a pre-gapped replacement that offers the best fit, form, and function. And with the 1 mm pre-gapped feature, the Bosch spark plug lets you experience a quick installation.

Performance Booster:

Ultra-fine wire ensures exceptional ignitability and performance, which is apparent in this product. And the copper core features here give a heat range to decrease pre-ignition and fouling.


This spark plug features ground electrode and Iridium, both of which create efficient combustion. In addition, as it is environment-friendly, it does not harm the parts disposal process.


  • Ribbed insulator design prevents flashover
  • Ultra-fine wire causes ignitability
  • Iridium firing pin provides good performance
  • Copper core gives a high heat range


The situation becomes tense during the repair.

#5. NGK-5464 Iridium IX Spark Plug

NGK (5464-4PK Iridium IX Spark Plug

NGK 5464 BKR5EIX-11 spark plug is a suitable fit for high-performance engines. It provides your vehicle an improved throttle response and anti-fouling elements. In addition, the copper core helps in transferring excess heat.

With the high melting point, it can create excellent electrodes and retains good characteristics. Thus, Iridium IX spark plugs ensure superior performance. In addition, you don’t need to change your spark plugs more often due to their complete combustion and excellent durability.

Key Features

Smoother Acceleration And Idle:

Throttle response and anti-fouling features ensure smooth acceleration. Also, the plug is all the way perfect for smooth functioning.


Trivalent Metal Plating gives resistance to corrosion and seizing issues. As a result, it improves your car driving experience. In addition, the high melting point enhances durability to heat and electrical wear.


Both the core and tip of the spark plug are made with Iridium. The 0.6 mm laser welded Iridium IX spark plug delivers stability. This stable material can decrease the quenching effect of the engine.

Projected Insulator Tip:

Insulator nose provides fouling protection. In addition, the corrugated ribs on the insulator will protect your car from flashing. Moreover, you will get a triple gasket seal from here to reduce the leakage rate of gas.

Performance Booster:

The Iridium alloy material ensures a high melting point. Thus, these spark plugs provide long-lasting performance to heat and electrical wear. In addition, since they come with the tapered ground electrode, you can stop the electrical quenching effect.


The anti-corrosion technology allows the car to perform positively in the environment.

Sparks Gap:

NGK (5464-4PK) Iridium IX Spark Plug works on 1.1 mm spark gaps.


  • Provides anti-seizing properties
  • Triple gasket seal excludes gas leakage
  • It protects engines from malfunction.
  • The taper-cut ground electrode ensures enough area for flame expansion.


  •  It needs a high-performance engine.
  • Vulnerable to higher temperatures

#6. NGK LKAR7BIX-11S Iridium IX Spark Plug

NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix)

You can improve your car’s productivity with the NGK LKAR7BIX-11S Iridium IX Spark Plug. It enables you to get the ultimate high-performance in the market. You can use these spark plugs in a hundred configurations for vehicle-specific applications.

Key features:

Smoother Acceleration And Idle:

The 0.6 millimeters sharp Iridium tip maintains produce and a continuous spark. Although, the sloped ground electrode lowers the consequence of electrical saturation. In this way, the spark plug ensures smooth acceleration overall.


NGK LKAR7BIX-11S Spark Plug has an excellent material Copper in the center electrode core. This material makes the car more productive than before. And here, the iridium center electrode tip works as the most sustainable metal among all raw materials. Moreover, because of the rigid metal, you can find spark plugs faster than spark plugs made of platinum.

Projected Insulator Tip:

The projected-center electrode indicates the tip is more subjected to complete combustion. It also means the sparking that emits closer to the combustion chamber’s heart.

Spark Gaps:

The Iridium of the spark plugs creates more gaps for cottage requirements. As a result, the spark plugs can move in the moment of extreme pressure. And its pre-gapped size is 4.04mm.

Performance Booster:

With the spark plug technology, NGK LKAR7BIX-11S spark plug stands out in the market. And the iridium IX comes with the performance lover in opinion, with extraordinary ignitability. Furthermore, the spark plug has greater engine sensitivity and improved rightwing properties.

These qualities give the plugs an efficient performance and acceleration.


In the field of ecology, NGK LKAR7BIX-11S Spark Plug is providing zero harm to the environment.


  • It generally requires less periodic maintenance.
  • It tends to give you consistent results.
  • Iridium center electrodes deliver long-lasting performance.
  • Trivalent metal plating ensures superior anti-corrosion properties.


• Higher temperatures increase its vulnerability.

• Updating is troublesome.

#7. NGK 7090 G-Power Platinum Spark Plugs For Subaru Outback

NGK 7090 G-Power Platinum Spark Plugs BKR5EGP

If your car is missing efficiency and acceleration, then NGK 7090 spark plugs can be a perfect choice. In addition, this spark plug does not leave particles after burning the car. So, pollution will stay away from the spark plug.

As it is made of platinum, your car will get a sharp edge over a conventional spark plug. And the durability is a benefit of platinum G-power spark plugs.

Key features:

Smoother Acceleration And Idle:

The platinum wire electrode makes it accurate for smooth running.


Anti-corrosion is a specialty of NGK 7090 G-Power Platinum Spark Plugs BKR5EGP. Also, the anti-seizing feature is relevant here for preventing cars from misfiring.

And in the case of fuel excellency, this spark is one of the best spark plugs that fit Subaru Outback.


The platinum electrode core and tip give economic upgrades to the cars. In addition, this material makes the plug conventional for car and other heavy material production.

Projected Insulator Tip:

NGK 7090 spark plug comes with a 0.6mm laser welded platinum tip. And this ground electrode circulates from the end of the shell. This electrode is short and provides better vibration resistance. And the spark plug leaves no stone unturned in giving excellent thermal conductivity from the electrode tip.

Spark Gaps:

The implementation of platinum creates more spark gaps for smooth functioning. And, you will get a 4.04mm spark gap by using this spark plug.

Performance Booster:

Corrugated ribs on the insulator prevent flashover. Also, there is a threefold sealing cover that eliminates the exhaust leaking system.


NGK 7090 G-Power Platinum Spark Plugs BKR5EGP does not cause any loss to the environment.


  • It helps to boost the power of your car’s engine.
  • It can protect your car from misfire.
  • The trivalent metal plating protects from corrosion and seizing.
  • It helps to prevent fouling.
  • Platinum tip center electrode enhances ignitibility.


  • It does not have high-quality materials.

Tips: Do you need a special socket for spark plugs and what size are Subaru Outback spark plugs?

Best Spark plug for 1996 Impreza and Subaru Legacy 1999:

If you have 90s models to very early 00s, you can choose NGK V Power Classic copper spark plugs. Check price here for classic NGK V Power. The classic copper OEM spark plug is cheap, well-performing, and the perfect fit for your oldies.

For the Subaru car and run smoothly, the gap is flexible and ranges from .039” to .044”. 

platinum and iridium plugs usually come pre-gapped.

For better conductivity, people go over the .044” limit for copper plugs

Iridium NGK Spark plugs can run 80 000 miles plus. So, save effort on changing them every 20k-30k miles.

Subaru’s spark plugs Wire

NGK (9160) RC-ZE21 Spark Plug Wire Set OE kit fits (non-turbo), 2005-2011 Impreza, 2007, 2008 and 2009 Legacy, etc.

Spark Plugs For Subaru Outback Buying Guide

Spark Plugs For Subaru Outback Reviews

Spark plugs usually help the engine to create better ignition and assists to decrease gas leakage of a car. But having bad or least-quality spark plugs won’t provide these benefits. Rather they will take you to a challenging situation. Therefore, choosing the best spark plugs for your Subaru is very important and necessary.

As you can see the right spark plugs for your Subaru will change your driving experience entirely. So, you should be aware of the following things to get the best spark plugs for your Subaru:

  • Go for the ultrasonic process (360-degree). It will enhance flexibility.
  • Pick a spark plug with a copper core because it offers a melting point of a higher number.
  • Choose a spark plug that is resistant to fouling.
  • Buy a spark plug that has a central electrode so that it can provide system management as well.
  • Look for a spark plug with an anti-collision feature because it will then protect your car from exploding.
  • Find a spark plug of ultra-fine wire so that it can ensure less amount of voltage.

If you can find all the above-mentioned features in a spark plug, then go for it because it is the best spark plug you can get for your Subaru.

Check How much does it cost to change spark plugs on a Subaru, Outback, Legacy, Impreza?

Frequently Asked Questions

#1. How much does it cost to change the spark plug on a Subaru?

There is no fixed answer to this question, but the average cost to change the spark plug on a Subaru is $377. But you should never take this amount as a fixed cost for spark plug replacement.

Because there are some other things on which the cost to change spark plugs highly depends. Subaru model is one of them because the replacement cost of each model is completely different from the other ones.

Market availability is another factor in not having a fixed price.

#2. How often should you change spark plugs on Subaru Outback?

Not changing the spark plugs of your Subaru can lead to problems like engine misfires, stalling, and starting issues. These problems will eventually lead to permanent damage to the engine of your Subaru Outback.

This is why you should change the spark plugs of your Subaru Outback regularly. But when it comes to the question of how often you should do the changes of spark plugs, then we will recommend you to change it after hitting 60,000 miles at first and then change it after every 30,000 miles to avoid those troubles.

#3. How much are spark plugs for a Subaru Outback?

There are eight different types and models of Subaru Outback available in the market. The price of these models varies from each other because of different features. Therefore, you should first learn the model of your Subaru Outback and then start looking for the spark plugs and their prices in the market.

Otherwise, you may end up getting the wrong ones for your Subaru Outback which won’t be useful at all. Prices of spark plugs of Subaru Outback start from $312 and go up to $872 based on their model and year. But the average price of the spark plugs of a Subaru Outback is $377.

#4. How many spark plugs go in a Subaru Outback?

You must need to know the answer to this question because without knowing the number of spark plugs in your Subaru Outback, you won’t be able to buy the right amount of spark plugs for your Subaru Outback.

Two spark plugs go in a Subaru Outback and the Subaru Boxer engine has two slots for horizontal mounting on both sides (driver and passenger) of the engine of Subaru Outback.


Spark plugs are capable of flame fuel and air mixture that creates the power to circulate the engine. So, you can understand the importance of them for the functioning of automobiles.

And by reading the writing, you can choose the best spark plug for Subaru outback. Undoubtedly, all these items will help you to choose the best spark plug. Best of luck!

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