Best Spark Plugs for Subaru Forester: Top 7 Recommendation

Spark plugs are, no doubt, one of the necessities for any engine to make it work. Many varieties of spark plugs in the prevailing market make it tough for anyone to choose from.

Your Subaru Forester is gaining age, and as you age, it needs some repairs and maybe some changes. Spark plug might be one of them, but the question which might and will arise is which spark plug you should choose.

Some are inexpensive, but some have a great configuration, how to choose. For your old friend, you ought to make a good choice. And here is my recommendation for Subaru Forester spark plugs.

Genuine Subaru 22401AA781 Spark Plug

Top 7 Best Spark Plug for Subaru Forester in 2021

  1. Best spark plugs for Subaru Forester- NGK (7090-4PK) BKR5EGP G-Power Spark Plug
  2. Best spark plugs for Subaru Forester 2011-2017 Forester 2.5 non-turbo- OEM Subaru Spark Plugs
  3. Best spark plugs for Subaru Forester xt- E3 Spark Plug E3.48 Automotive Spark Plug
  4. Best spark plugs for 2015 Subaru Forester- NGK (7090-4PK) BKR5EGP G-Power Spark Plug
  5. Best spark plugs for 2010 Subaru Forester- DENSO #4503 PLATINUM TT Spark Plugs — PK16TT
  6. Best spark plugs for 2014 Subaru Forester- NGK 6619 Iridium Spark Plugs LFR6AIX-11
  7. Best spark plugs for 2002 Subaru Forester- Denso Platinum TT Spark Plugs

Comparison Table of Spark Plug for Subaru

IMAGENAME & DetailsDETAILS
DENSO #4503 PLATINUM T T Spark Plugs -- PK16TT
  • Platinum core material
  • Pre-gapped: 0.039”
  • Trapezoid cut ground electrode
Check Price
NGK 6619 Iridium Spark Plugs LFR6AIX-11
  • Set of 4
  • Has replacements
  • Kit includes OEM sealed items
Check Price
NGK 6619 Iridium Spark Plugs LFR6AIX-1
  • Platinum core material
  • Come with 6 pieces
  • Pre-gapped at 0.035”
Check Price
NGK (5464-4PK) Iridium IX Spark Plug
  • Iridium core material
  • Comes with 6 pieces
  • Pre-gapped at .043”
Check Price
NGK (5464-4PK) Iridium IX Spark Plug
  • Iridium core material
  • Longer insulator nose
  • Trivalent Metal Plating
Check Price
E3 Spark Plug E3.48 Automotive Spark Plug
  • Alloy steel material
  • DiamondFire electrode technology
  • Thread Diameter: 14mm
Check Price
Denso Platinum TT Spark Plugs Stock 4503 Platinum Core
  • Platinum core material
  • Set of 8 pieces
  • Pre-gapped at 0.035”
Check Price

Which one is the best spark plug for Subaru Forester?

Compared to any other spark plugs, genuine NGK (7090-4PK) BKR5EGP G-Power Spark Plugs are the best for Subaru Forester. NGK G-Power Spark Plug is preferable and better than the other ones.

The configuration is of the original one and made by the car manufacturers. The other spark plugs might have issues in gaps, wire, or in longevity which is normal.

But Subaru Forester spark plug wires and Subaru Forester spark plug gap is very significant, to be precise. Here the NGK spark plugs have the exact wires and are gapped for the vehicle.

Even for different specifications, this kit is composed of components with legitimate Subaru Forester spark plugs with different specifications in accordance with your need and liking.

  • NGK spark plugs are made in a certain way so that they can provide the best possible performance as they are made from the best metals and porcelain.
  • It is known to all that the original spark plugs in your Subaru Forester last the longest. Here, the genuine NGK G-Power Spark Plug spark plugs are authentic, and for that, they last as long as the first ones.
  • The genuine NGK (7090-4PK) BKR5EGP G-Power spark plug will help your engine to remain at its best possible state and performance.

Our Recommended Top 7 High Performance Subaru Forester Spark Plugs Reviews in 2021

#1. NGK (7090-4PK) BKR5EGP G-Power Spark Plug

NGK (7090-4PK) BKR5EGP G-Power Spark Plug is manufactured by the brand NGK. NGK makes reliable and efficient products, and people love these products. NGK G-Power Spark Plug has been one of the best-selling products of the brand NGK.

This improvised lightweight spark plug has been used as a Subaru Forester Spark plug replacement for a while. The Nickel laser-welded tip allows the spark plug to produce consistent sparks, quicker starts and lessens the voltage usage.

The beautifully built trapezoid-shaped nickel electrode with trivalent metal plating makes it stronger and lasts longer, even minimizes the quenching and gas leakage.

Technical Features:

  • Center Electrode Material: Platinum
  • Ground Electrode Material: Nickel
  • Resistor: Yes
  • Longevity: 40k miles
  • Heat Range: 5

Features:

Performance: NGK (7090-4PK) BKR5EGP G-Power Spark Plug can give superior performance. It improves fuel efficiency, ensures lower emission. It also allows quicker starts. The 0.6 mm laser welded tip helps the sparks to be consistent and stable. It also reduces the voltage requirement.

Structure: NGK (7090-4PK) BKR5EGP G-Power Spark Plug has a platinum center electrode with a 0.6 mm size. It is a fine wire type. The ground electrode is made of nickel and is trapezoid-shaped. The spark plug is pre-gapped at 0.039”. Its seat type is a gasket and has a solid terminal. The thread diameter is 14mm.

Qualities: The spark plug has insulator noses with special configurations, which improves the throttle response and helps to prevent any foul, and even prevents flashovers. Trivalent metal plating prevents corrosion and seizing.  The trapezoid cut ground electrode helps to reduce quenching.

Pros:

  • NGK (7090-4PK) BKR5EGP G-Power Spark Plug is a set of 4 pieces. It fits well and is of the precise gap during the plug life in any vehicle like Subaru Forester and uses less voltage compared to other spark plugs.
  • The ground electrode has a trapezoid cut which is rare in the other spark plugs. It helps in the elimination of quenching.
  • The spark plugs available in the market have, usually, longevity of 30k miles. But this well-built spark plug has the longevity of 40k miles which is more than most spark plugs.
  • This spark plug is improvised and remodeled in such a way that it averts fouling, corrosion, and gas leakage.

Cons:

  • The spark plug has to be put in perfectly. Otherwise, the plug will tend to come out that very moment, and it will, afterward, cause trouble for you.

#2. OEM Subaru Spark Plugs

OEM Subaru Spark Plugs Forester Impreza Legacy Crosstrek 2011-2017 22401AA781 is made by OEM Company. They are well known for their reliable and efficient products. The car manufacturers make OEM products directly and the plugs have never been disappointing.

The Kit includes 2011-2017 Forester 2.5 non-turbo, 2012-2016 Impreza 2.0 non-turbo, 2013-2017 Legacy and Outback 2.5 non-turbo, 2013-2016 Crosstrek 2.0 non-turbo spark plugs. It includes all the range of plugs with varied specifications that you might use for your Subaru Forester. The longevity of these spark plugs is more than anyone has anticipated just like the original ones built in the car.

Technical Features

  • Manufacturer: Subaru
  • Warranty: 1 year
  • Kit Items: 2011-2017 Forester 2.5 non -turbo, 2012-2016 Impreza 2.0 non-turbo, 2013-2017 Legacy and Outback 2.5 non-turbo, 2013-2016 Crosstrek 2.0 non-turbo
  • Pre-gapped: Yes

Features:

Kit:  The kit consists of 4 items. All four have a specification that meets the requirements of any Subaru Forester made since 2011. All the spark plugs are made of great quality, and they can fulfill the requirements of the car.

Genuine Subaru Plugs:  If you own a Subaru Forester and looking for a new spark plug, but you prefer the exact ones instead of any other replacements, this kit is for you. Your car can be of any year. This kit will have the one you require and more so that you can replace them in the future very easy.

Manufacturers: The car manufacturers themselves make the spark plugs. So the genuine OEM Subaru Spark Plugs Forester Impreza Legacy Crosstrek 2011-2017 won’t disappoint you. You don’t have to settle for other components that you don’t trust.

Pros:

  • The kit has four spark plugs. All of the spark plugs have different specifications so that you can have the one you need easily. Moreover, you get four different spark plugs for the price of one.
  • The car manufacturers themselves make the items. As a result, you don’t have to worry about its performance as the spark plug is authentic, easily making its place in the best spark plugs on the market.
  •  Subaru OEM spark plugs have the original specifications and build. As a result, the longevity on these spark plugs is as in the original, and can easily last for 60k miles.
  • All the spark plugs are pre-gapped and have the exact specification which can be used as 2012 Subaru Forester spark plug replacement, 2009 Subaru Forester spark plug replacement, 2011 Subaru Forester replacement, 2014 Subaru outback replacement, and so on.

Cons:

  • The kit has four different items which have different specifications. You do get the one you need, but after that, there are extra items left.
  • The kit is of all the original components. But the kit is comparatively pricier than the ones you can find in the market.

#3. DENSO #4503 PLATINUM TT Spark Plugs — PK16TT

DENSO #4503 PLATINUM T T Spark Plugs — PK16TT is made by the company DENSO. They are now known for being one of the largest automotive-component suppliers. So far, they have been able to exceed the expectations of their users.

The 1.1mm Platinum central electrode, mentioned in the name, has a fine wire type and gasket seat. This budget-friendly elegant spark plug has rare resistors of 5k Ohm with 16 heat ranged and machine-rolled thread, which is more than most spark plugs. The pre-fired five ribbed insulator is purified alumina powder allowing the spark plug extra strength and thermal conductivity to prevent flashovers.

Technical Features:

  • Ground Electrode Material: Titanium
  • Pre-gapped: 0.039”
  • Heat Range: 16
  • Resistor Value: 5k Ohm
  • Longevity: 30k Miles

Features:

Specification:  DENSO #4503 PLATINUM T T Spark Plugs — PK16TT has a great body. The center electrode is platinum with a fine wire type. It has a solid terminal and a gasket seat type.  The ground electrode is of titanium. The resistor is present with a value of 5k Ohm. The thread diameter is 14 mm.

Efficiency: The spark plug’s design is specifically for efficiency and consistent sparks. This spark plug has a twin-tip design which results in better engine performance and efficient combustion. It even reduces fuel usage. The threads are machine-rolled, so it prevents cross-threading or seizing while installing or removing it.

Durability: DENSO #4503 PLATINUM T T Spark Plugs — PK16TT is a well-built spark plug. It can last long and produce sparks. The spark plug is pre-fired to ensure a consistent spark and to have the highest quality. The insulator is purified alumina powder, giving in more strength and thermal conductivity, which even prevents flashover.

Pros:

  • DENSO #4503 PLATINUM T T Spark Plugs — PK16TT is a set of 6 piece spark plugs. All are similar to each other to change easily at any time and at a price for one spark plug, which seems like a great deal.
  • The spark plug is a well-built machine and super easy to install. It can perform well and create stable, consistent sparks.
  • The average resistor value of a spark plug is about 4k Ohm. But this elegant spark plug has a heart range of 16 with a resistor value of 5k ohm, which is much more.
  • The pre-gapped, machine-rolled thread and pre-fired spark plug have a well-built body that staves off seizing, flashovers, and gas leakage with its specifications.

Cons:

  • DENSO #4503 PLATINUM TT Spark Plugs — PK16TT is a good deal.  But they are to be installed properly, or else, it might cause problems for you. Sometimes, the gap is set incorrectly.

#4. NGK 6619 Iridium Spark Plugs LFR6AIX-11

NGK 6619 Iridium Spark Plugs LFR6AIX-11 is from the IX series of NGK brands. The car manufacturers and service advisers usually recommend getting NGK spark plugs installed. This spark plug has a great body while performing a wide range of functions.

With the long-lasting Iridium center electrode, the tapered ground electrode lessens the electrical quenching effect while increasing the horsepower. The amazing spark plugs have a copper core removing heat, and a fine laser-welded 0.6mm tip lets the spark plug be durable and create consistent sparks. The corrugated ribbed insulator has longer noses that rule out flashover, while the triple gasket eradicates the combustion gas leakage.

Technical Specification/ Features

  • Center Electrode Material: Iridium
  • Seat Type: Gasket
  • Type: Fine Wire
  • Resistor Value: 5k Ohm
  • Longevity: 50k Miles

Features

Durability: NGK 6619 Iridium Spark Plugs LFR6AIX-11 is made from iridium. Iridium has a very high melting point. So, the spark plug can perform remarkably at high temperatures and is efficient. The center electrode has a fine wire which also confirms high durability.

Consistency: The spark plug is designed to produce consistent sparks without any drawbacks. The fine wire ensures the sparks, and the copper core helps to remove the heat. NGK 6619 Iridium Spark Plugs LFR6AIX-11 is a set of 6 pieces which is a big advantage for the users.

Build: The spark plugs build amazingly. It has a trivalent metal plating which helps to prevent corrosion and seizing. The iridium makes it durable, and the copper core helps to remove heat. It has a triple seal which helps to prevent leaks. It has a pure alumina silicate insulator which ensures greater strength and better heat transfer.

Pros:

  • NGK 6619 Iridium Spark Plugs LFR6AIX-11 is a set of 6 pieces. It is a great offer as you get six pieces of spark plugs for the price of 1.
  • The spark plug has great durability and is super easy to install in vehicles like Subaru Forester. It can survive rough environments and high temperatures with high longevity.
  • This fantastic spark plug has a longevity of 50k miles which is more than almost every other spark plug.
  • NGK 6619 Iridium Spark Plugs LFR6AIX-11 has a good amount of resistor value and heat range. The resistor value is 5k Ohm, more than the available ones on the market.

Cons:

  • NGK 6619 Iridium Spark Plugs LFR6AIX-11 is a very reasonable option. But compared to the other spark plugs, the plug set is a bit expensive.

#5. NGK (5464-4PK) Iridium IX Spark Plug

NGK brand has been creating NGK (5464-4PK) Iridium IX Spark Plug. Genuine NGK products have always been able to satisfy the users to a greater extent, even to the point where the car manufacturers and the service advisers suggest getting them.

The iridium center electrode material with copper core has a nickel ground electrode material with a tapered cut built for technologically advanced vehicles. This efficient spark plug can increase horsepower, prevent fouling and improve throttle response as it uses less voltage. With extreme ignitability, the laser-welded tapered cut tip secures steady sparks and minimizes the quenching effect.

Technical Features

  • Central Electrode Material: Iridium
  • Seat Type: Gasket
  • Thread pitch: 1.25 mm
  • Resistor: Yes
  • Heat Range: 5

Features

Material: NGK (5464-4PK) Iridium IX Spark Plug has iridium center electrode as it is in their name. The ground electrode is made of Nickel, and its shape is taper cut. The projection in it is projected. The terminal type is solid.

Properties: The spark plug has been designed in a manner that it can offer extreme ignitability and a better throttle response. It gives superior anti-fouling.

Qualities: NGK (5464-4PK) Iridium IX Spark Plug has trivalent metal plating. For this, it can prevent corrosion and seize. The center electrode is made of iridium with a very high melting point, so it can easily perform well even at a very high temperature making it highly durable. There is a longer insulator nose on it, which prevents fouling and flashover.

Pros

  • NGK (5464-4PK) Iridium IX Spark Plug has been designed for the best performance and anti-fouling, even stable, consistent sparks. It comes as a box of 4 pieces.
  • The spark plug gives superior anti-corrosion and eliminates gas leakage, which is great for today’s advanced engines.
  • This rugged spark plug has iridium as its core material. For this, it can easily work under high temperatures and even increase the vehicle’s horsepower as it uses less voltage.
  • The tapered cut ground electrode material enables the spark to diminish the quenching effect. This specific feature is not present in most of the spark plugs obtainable.

Cons

  • NGK (5464-4PK) Iridium IX Spark Plug gives a great performance, but it is a bit pricey compared to the other available spark plugs. The heat range is also a little less than the other spark plugs.

#6. E3 Spark Plug E3.48 Automotive Spark Plug

An E3 Spark plug produces the E3.48 Automotive Spark Plug. The spark plug is known for its ability to sustain any and every condition as it has a powerful build. It has been proven to be user-friendly and be used by many.

The durable spark plug has a guaranty of 5 years and 100000miles. DiamondFire electrode technology is used in this robust spark plug which lets the spark plug create superior sparks and create more pressure eliminating carbon deposits. Depending on the engine class, the power and fuel efficiency has been enhanced. The CO and hydrocarbon emissions have been reduced radically.

Technical features

  • Seat: Gasket
  • Resistor: Yes
  • Thread Reach: 0.750”
  • Pre-gapped: Yes
  • Exterior: Machined

Features

Technology: E3.48 Automotive Spark Plug is made in the most technologically advanced way possible at this time. For a superior spark, DiamondFire electrode technology is used. It produces more pressure and results in the flame front expanding further.

Potentiality: There has been a significant increase in power from 6 percent to 12 percent. Improvisation in fuel efficiency from 4 percent to 13 percent is seen. These depend on the engine class.

Reduction: The average spark plugs cause quenching and emission. But this spark plug is an improved version, and the potential emission is reduced when used in 2-4 stroke engines. The carbon monoxide and hydrocarbon emissions have been reduced 58 percent and 42 percent.

Pros

  • The spark plug has been built with the best technologies. As a result, it is comparatively more efficient than the other spark plugs and has incredible emission reduction.
  • E3.48 Automotive Spark Plug is an efficient spark plug with the advanced build. The fuel efficiency has been enhanced drastically.
  • The everlasting spark plug provides a warranty, unlike anyone 100000 miles and a five-year warranty. In the case of spark plugs, such things are extremely rare.
  • This elegant Spark plug has DiamondFire electrode technology, which is very rare in the spark plugs that are known today. It enables great performance by the spark plug creating superior sparks and extra confined pressure.

Cons

  • The spark plug might cause a rise in temperature in the engine, but that is only 1 to 3 degrees max. The spark plugs are preferred more in motorbikes than cars.

#7.Denso Platinum TT Spark Plugs

DENSO has been producing products for a long while, and they have successfully satisfied their users to the most. Denso Platinum TT Spark Plugs Stock 4503 Platinum Core .039″ is one of the best-selling spark plugs out there. The products are easy to install and are available almost everywhere.

For any technologically advanced vehicles, this user-friendly spark plug has a 1.1mm platinum cored center electrode and a 1.1 mm titanium cored ground electrode with a fine wire type fitting smoothly. The 5k resistor valued spark plugs have a longevity of 60k miles which is more than many spark plugs. This sturdy spark plug offers cutting-edge technology that allows greater steady sparks.

Technological features

  • Center Electrode Material: Platinum
  • Ground Electrode Material: Titanium
  • Resistor: Yes
  • Pre-gapped: 0.039”
  • Seat Type: Gasket

Features

Material: Denso Platinum TT Spark Plugs Stock 4503 Platinum Core .039″ has a center electrode material of Platinum and a titanium ground electrode. It is a fine wire type with a solid terminal. DENSO produces this spark plug, and it has been around for a while.

Attributes:  This spark plug has been designed in such a way that it can last and can easily fit into technologically advanced vehicles. But it can even fit in a Subaru Forester. The spark plug can easily create the sparks and prevents any quenching.

Resistance: The spark plug has been manufactured to be resistant to higher heat and temperature. It has a longevity of 60k. It is a resistor-type spark plug and has a heat range of 16. Its resistor value is 5K Ohm. The center electrode projection is projected. It has a minimum-quench design in its electrode.

Pros

  • The spark plug is built in a way that it can survive the heat. It is built so that the quenching is minimized, but the efficiency is at its best. It is even easy to install.
  • The spark plug is made for technologically advanced vehicles. But it even fits the earlier versions and works well. It is a set of 8 pieces for the price of 1, which is a good deal.
  • This efficient spark plug can easily work in high heat with a rare 5k resistor and 16 heat ranged.
  • With a well-built body, the spark has a longevity of 60k miles which is much significantly more than the spark plugs that are up for grabs.

Cons

  • The spark plugs are completely fine, but sometimes they come a little off. They are to be installed properly, otherwise, they will cause problems.

Conclusion

If you don’t change your spark plug when it’s gone bad, it might cause so many troubles to your engine, including performance, excess fuel consumption, an increase of carbon emission, and so on. So it’s wise to change your beasts’ spark plug as soon as it shows the symptoms. You can choose any of the above spark plugs without any hesitation. Just make sure it fits your vehicle.

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