The Best Spark Plugs

Depending on the reliable spark plugs can make my car perform well

Due to its size, a lot of people take spark plugs for granted without realizing the significance of its role in a car’s functionality. Without this tiny car component, a vehicle will be rendered useless because it won’t be able to start.

The spark plug is the component that provides the spark that the car needs to ignite the mixture of fuel and gas; creating the burst of explosion that enables the engine to generate power. This makes the tiny component vital to a car’s ignition system.

Getting the best spark plugs is crucial to the maintenance of a car because it will ensure its ignition system’s optimum performance, reducing the chance of your car struggling to to start.

If you need to replace the spark plug of your car, this buying guide will help you choose a reliable and top-quality replacement plug in the market today.

In A Hurry? Here’s My Top Picks…

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TOP PICK
NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCSNEW
Denso (3297) SK20R11 Iridium Spark Plug, Pack of 1
NGK (5464-4PK Iridium IX Spark Plug, (Box of 4)
Product
NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCSNEW
Denso (3297) SK20R11 Iridium Spark Plug, Pack of 1
NGK (5464-4PK Iridium IX Spark Plug, (Box of 4)
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Price
$34.99
$8.99
$24.85
TOP PICK
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NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCSNEW
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NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCSNEW
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Price
$34.99
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Preview
Denso (3297) SK20R11 Iridium Spark Plug, Pack of 1
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Denso (3297) SK20R11 Iridium Spark Plug, Pack of 1
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Price
$8.99
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NGK (5464-4PK Iridium IX Spark Plug, (Box of 4)
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NGK (5464-4PK Iridium IX Spark Plug, (Box of 4)
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Price
$24.85
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Top 10 Best Spark Plugs Reviews

To make your quest for searching the ideal spark plug replacement for your car, here’s a list of my top picks for the best plugs in the market. With this list you will discover the top replacement spark plugs that you can consider on your search.

1. The LFR6AIX-11 6619 Iridium Spark Plugs From NGK (6pcs)

Coming in a pack of six, the first item on the list is considered as one of the perfect options for hobbyists and professional auto mechanics.

It’s the LFR6AIX-11 6619 Iridium Spark Plugs manufactured by NGK. With six premium spark plugs bundled in and all in one package, this is a great investment that can be fruitful in the long run.

Well suited for Lexus and Toyota vehicles, these reliable plugs are automotive parts made of iridium.

These plugs are engineered with fine-threaded electrodes that makes them very efficient, not to mention that they are built to last 25% longer compared to the standard ones in the market.

Considered as one of the premium products that you can get in the market, these spark plugs are designed and engineered to offer exceptional performance as well as longer service life.

This allows your car to have a better and improved experience as well as performance. It will also last for a long time.

As one of the strongest competitors in this list, these spark plugs manufactured by NGK have plenty of exceptional features to offer. Features that also cost a lot, which makes one of its downsides expensive. For a lot of normal drivers, it can be a very pricey investment that may make them think twice before making a purchase.

As expected, these Iridium Spark Plugs are feature-packed products that will come at a higher cost.

But if you will take a deeper look into the impressive features that they offer, I say that they are definitely worth every penny invested in them.

Pros

  • Longer-lasting
  • Great durability
  • Efficient and reliable
  • Fine threaded electrodes

Cons

  • Expensive
  • Impractical choice
TOP PICK
The LFR6AIX-11 6619 Iridium Spark Plugs From NGK (6pcs)
$34.99
Buy on Amazon
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09/02/2021 12:03 pm GMT

2. The SK20R11 (3297) Iridium Spark Plug From Denso

Masterfully crafted to perfection, the next offering on the list ensures longer service life as well as optimum performance. This is Denso’s SK20R11 (3297) Iridium Spark Plug, one of the most popular items in the market today.

It is considered to be one of the most recommended models out there because they are considered as an OEM part of some car manufacturers out there.

This spark plug model by Denso is engineered and designed to be sturdy and very durable. It is a model that can stand the test of time as it is six to eight times tougher than its platinum counterparts.

Thanks to its design, that better protects its electrodes from the gradual everyday wear and tear.

The spark plug made of iridium is crafted to deliver exceptional performance and excellent acceleration. It is versatile and it features a perfect mixture of platinum and iridium materials, making it compatible with most of the vehicles today.

Plug is designed to provide stable combustion when it is idle, which makes it very promising for drivers.

One of the setbacks of this product is that unlike the other spark plugs on the list, this model may not fit for some vehicle applications. With an issue like this, consumers may raise some concerns about its dependability. Since a plug that can suit all applications is more appealing compared to this one.

Apart from the fact that this Iridium Spark Plug from Denso may not suit some vehicle applications, I still think that this is a great contender on this list.

As one of the most sought after spark plugs for high-performance cars such as off-road trucks, it is very reliable and durable enough to be worthy of your money.

Pros

  • Improve car’s performance
  • Eliminates engine fouling
  • Impressive toughness
  • Great durability

Cons

  • Unsuited for some applications
  • Not desirable as others
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09/02/2021 12:06 pm GMT

3. The Iridium IX 5464-4PK BKR5EIX-11 Spark Plug From NGK (4pcs)

The next product on the list is considered a high-grade product that promises remarkable performance and outstanding reliability. Check out the Iridium IX 5464-4PK BKR5EIX-11 Spark Plug from NGK.

As a versatile spark plug that is compatible with most of the vehicles today, it’s another model from NGK that you have to consider.

The product is a multifaceted spark plug designed to deliver impressive ignitability and to have enhanced throttle responsiveness. It is engineered to have superior protection against engine fouling.

The plug features a technology that gives it its tapered ground electrodes that efficiently reduces the electrical quenching effect.

This spark plug is fabricated with a triple gasket cap designed to eliminate gas leakage produced by combustion. It features corrugated ribs that protect it from flashovers, boosting its performance.

In addition, this spark plug from NGK has anti-seizing and anti-corrosion properties to extend its service life, making it a recommended choice for high-performance cars and off-road vehicles.

One of the things that raised some concerns about this plug is that it has to be re-gapped for some vehicles. This makes it a major setback because it won’t be suitable for new drivers or car owners. It also makes it an inconvenient option because it requires an additional process before being used.

As a spark plug manufactured by one of the most popular and trustworthy brands in the automotive industry, this plug is considered to be an excellent replacement part.

Despite its setback, it is a versatile, high-grade product that is far too beneficial to be overlooked. With its excellent brand reputation as well as great performance, this model deserves a closer look.

Pros

  • Impressive durability and toughness
  • Better throttle responsiveness
  • Boosts acceleration
  • Reasonably priced

Cons

  • Regapping is required
  • Inconvenient
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09/02/2021 12:05 pm GMT

4. The BKR5E-11 (6953) V-Power Spark Plug From NGK

If you are in the market for a proven and tested, reliable spark plug built by a brand with decades of experience and exceptional reputation, the V-Power BKR5E-11 (6953) spark plug might be the one for you.

Once again, you are looking at a plug manufactured by NGK. So, you can expect top of the line features, top-notch quality, and stellar performance.

Considered as one of the top spark plugs manufactured by NGK, this plug is engineered with a one of a kind electrode design. It is design to improve and extend service life, making it one of the smartest choices in the list.

The plug features an integrated notch that gives it its shape that helps improve an engine’s performance and enhance its mileage.

Another excellent feature that this plug has is its impressive construction. Built with its patented trivalent metal plating tech, this plug has exceptional protection against seizing and corrosion.

The spark plug can deliver a sufficient amount of igniting power for less voltage consumption.

In addition to all of that, this model is built to reduce fouling and emission.

The greatest drawback of this spark plug manufactured by NGK is the fact that its electrodes are not nickel tipped. This may seem to be a concern for some consumers because it may affect its overall performance. However, if you can overcome it, there will be no further issues to think about.

In conclusion, this spark plug has the superiority and reliability to make it deserving to be on this list.

Aside from having the excellent features that will help improve a car engine’s performance, it is a tested and proven product that is beneficial for you and your car.

Pros

  • Improves engine performance
  • Low upkeep required
  • Sturdy construction
  • Cheapest on the list

Cons

  • Not nickel tipped electrodes
  • Erratic performance
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09/02/2021 12:04 pm GMT

5. The BKR5EGP 7090-4PK G-Power Spark Plug From NGK (4pcs)

Exceptional performance, superior durability, and compatibility with most cars, trucks, and bikes today are the qualities the next item promises.

Check out NGK’s BKR5EGP 7090-4PK G-Power Spark Plug and discover the transformation of your car’s performance. Like the other models from NGK on this list, this is an incredibly reliable model that plenty of drivers will love.

This product is made from platinum alloy specifically engineered to be fuel-efficient, to reduce emissions, and to deliver optimum performance even in quick start situations.

It features a platinum tip to provide stable and consistent sparks with less voltage or energy consumption.

The spark plug is masterfully crafted to have enhanced throttle responsiveness for better acceleration.

Built with corrugated ribs that prevent engine fouling and flashovers, the plug features a unique center electrode to produce substantial sparks and to have a longer service life.

It has the trivalent metal plating construction that gives it its anti-seizing and anti-corrosion properties.

The appearance of the spark plug is its greatest setback. Based on the feedback that I’ve read, a lot of users said that they got turned off the first time they saw the actual product. Most of them said that it looks to be inferior because of its poor-looking construction.

Despite looking to be cheaply made, this Plug from NGK still deserves to be on this list because it has the performance to back it up. It has a good reputation that can assure consumers of its excellent quality.

Pros

  • Reasonably priced
  • Maintenance-free
  • Convenient
  • Sturdy and durable

Cons

  • Cheap-looking build
  • Inferior to others
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09/02/2021 12:04 pm GMT

6. The Platinum+4 4417 FGR7DQP Spark Plug From Bosch Automotive

Coming from a well-renowned brand in the power tools and automotive industry, this next spark plug claims to be an extremely reliable car part to consider.

Let’s take a look at Bosch’s Platinum+4 4417 FGR7DQP Spark Plug and discover if its exceptional brand reputation is as good as its quality and performance.

This reliable spark plug is expertly fabricated with the brand’s patented air gap firing tech that features yttrium-ground electrodes.

This sophisticated tech allows prime access to a car’s air and fuel mixture that results in better combustion—allowing the spark plug to deliver powerful and long sparks to boost an engine’s performance.

The unique electrode design also lessens the gap wear and oxidation of the part, further extending its service life.

The plug is masterfully fabricated with a corrugated spark plug insulator nose that immensely reduces the risk of flashovers and improves its throttle reaction.

Bosch Automotive designed the plug to be easily installed with no regapping required, making it one of the most convenient products in the market today.

Despite its impressive features and amazing qualities, the spark plug from Bosch also has a few downsides. One of them is not being suitable for all vehicle applications, which raises some concerns for consumers—especially the ones looking for an all-round spark plug replacement.

If the fact that this spark plug manufactured by Bosch does not bother or concern you, then it is safe to say that it can be one of your best options to consider.

As a product fabricated by a widely recognized brand, it is certainly a reliable and top quality one that will deliver optimum performance that you.

Pros

  • Eliminates engine fouling
  • Exceptionally durable
  • Lessens oxidation
  • Boosts engine’s performance

Cons

  • Unsuited for some applications
  • Inconvenient to some
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09/02/2021 12:03 pm GMT

7. The Copper Plus RC12ECC (438) Spark Plug From Champion

Featuring a one of a kind, patented electrode structure, this next spark plug manufactured by one of the well-known brands in the automotive industry is a product you have to check out.

Introducing Champion’s Copper Plus RC12ECC (438), one of the best quality plugs on the list at an affordable price. The perfect spark plug replacement to be considered.

Manufactured by Champion, the plug is crafted with its patented Copper Core Center design electrode.

A sophisticated technology that gives it an accurate and precise control of heat range to extend service life. It is engineered with unique Ultraseal shell that gives it its impressive resistance against corrosion.

This plug is built to pass both the SAE and ISO standards with flying colors, making it extremely durable and dependable. Boasting its distinctive SAC-9 resistor, this plug has a maximized RFI and EMI suppression.

Furthermore, it is compatible with all automotive-related applications.

This spark plug manufactured by Champion, sometimes create misfire error codes. A setback that will certainly raise a lot of concerns to consumers. On that note, a lot of consumers think twice about this particular product.

For drivers or car owners that are willing to risk the misfire error codes that this plug may produce, this is a good product to consider. However, for expert car owners and seasoned drivers, it may be gambling to the losing end.

Pros

  • Good brand reputation
  • Passed the OEM standards
  • Durable and sturdy
  • Long service life

Cons

  • Generates misfire error codes
  • Inconvenient
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09/02/2021 12:03 pm GMT

8. The 9652 Double Iridium OE Spark Plug From Bosch

For drivers in the market looking for a spark plug that can handle the extreme demands of higher-performance vehicles such as cars used for off-road racing.

The 9652 Double Iridium spark plug from Bosch might seal the deal. With its tougher construction compared to its platinum and copper counterparts, it is a model that offers more power and durability.

Compared to the standard plugs made from copper, this one offers four times longer performance life because of its double iridium ground inlay electrode and firing pin.

It is engineered with a fine wire pin that allows it to deliver more ignitability that enhances its performance.

This Spark Plug from Bosch comes with a seven-year satisfaction guarantee to ensure its exceptional quality.

Its full construction features a 360-degree laser weld that gives it its remarkable resistance against corrosion. This is why this is a recommended OE part by a multitude of vehicle manufacturers.

One of the things that people didn’t like about this spark plug is that it may not work with a few vehicle builds. To be sure that this model will suit your car, you may have to double-check its specifications, which may not be very convenient. Other than that, there are no issues to be worried about this one.

Although it is considered as the OEM replacement part by plenty of vehicle manufacturers, it may still work well with a few models. However, beyond that setback, this Double Iridium spark plug of Bosch is still a smart investment that is definitely worth a recommendation.

The fact that it can handle the most extreme demand for off-road racing vehicles, a lot of drivers would love to have this one.

Pros

  • Extreme durability
  • Exceptional brand reputation
  • Longer-lasting product
  • Corrosion resistant

Cons

  • Unfit for few vehicles builds
  • Incompatibility issues
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09/02/2021 12:03 pm GMT

9. The RapidFire 1 Professional Spark Plug From ACDelco

Offering a wide assortment of amazing and impressive features, this next spark plug is truly a model that every driver should check out.

Let’s look at ACDelco’s RapidFire 1 Professional, a spark plug model that comes from one of the titans in the auto industry. Discover why it is one of the most sought after models today.

This is a spark plug that features a core made of pure copper that provides it with an exceptional ability to transfer heat, which significantly increases its durability.

ACDelco masterfully engineered this plug with a solid suppressor consisting of a brass seal and two-piece glass. This gives it the protection from pressure due to combustion, reduces the interference, and extends the life of the electrode.

Fabricated with platinum on the center electrode this plug greatly reduces a car’s ignition system voltage consumption by giving it the ability to produce an exceptional spark.

This spark plug has a ribless insulator nose that significantly improves its boot seal, furtherly extending its service life.

Its greatest drawback, is the need of frequent replacement. An issue like this may make consumers think twice about investing in a product. However, it is too feature-packed to be overlooked.

From my standpoint, after considering everything that I’ve read and learn about this spark plug. I say that it is a smart buy, a good deal that will provide drivers plenty of benefits by paying less for the product.

Furthermore, it is one of the cheapest plugs in this list.

Pros

  • Eliminates engine fouling
  • Cheap option
  • Tough and durable
  • Solid suppressor

Cons

  • Frequently changed
  • Poor quality
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09/02/2021 12:06 pm GMT

10. The CR9EK 4548 Standard Spark Plug From NGK

My final pick on the list is a spark plug made only from the finest materials to ensure toughness and durability. Again coming from NGK, another good option to consider is the CR9EK 4548 Standard Spark Plug.

As a product offered by one of the top performance brands in the automotive industry, this is another good contender that deserves a closer look.

Featuring a core made of solid copper, the plug from NGK offers impressive heat conductivity and dissipation.

It can produce greater sparks while consuming lesser voltage. It is built with dual ground electrodes to deliver consistent and substantial sparks every time it operates.

This standard plug is engineered to have a longer insulating nose and corrugated ribs to boost its performance.

With this design, the plug is very much capable of preventing engine fouling and flashovers while its triple-gasket feature and its zinc-dipped shell give it an anti-corrosion property the ability to prevent combustion leakage.

Although it has an affordable price tag, most of the negative reviews I’ve read about this spark plug is its poor appearance or packaging. Most of the reports say that it looks like a cheaply made plug that may be inferior to its counterparts. This raises an issue for a lot of consumers.

It is said that looks can be deceiving, and with this spark plug, it may seem to be true.

This Standard Spark Plug has the functionality and durability every driver needs, so I say that it only looks inferior, but performance-wise, it has a lot to offer.

As an affordable product that can deliver its claims, this is a spark plug that you have to consider.

Pros

  • Very affordable replacement
  • Boost engine’s performance
  • Quick installation
  • No regapping needed

Cons

  • May look inferior
  • Durability issues
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09/02/2021 12:05 pm GMT

Best Spark Plugs Buying Guide

Be enlightened by learning the basic and essential things that every driver should know about spark plugs. Here are some significant information that will help you identify the qualities that an ideal plug should have.

All the information disclosed below will give you the proper knowledge that will help you pick which is the ideal plug for your needs.

Purchasing the right fit of spark plugs can run your car smoothly and perform better for the long run

How Does A Spark Plug Work?

A spark plug is an important vehicle component responsible for providing the ignition the engine needs to start. Without this small yet significant part, a car engine won’t have the energy explosion that it needs to start and operate.

In most cases, due to its small size, this part is overlooked by plenty of drivers, without realizing that despite its size, it plays a huge role in how a vehicle’s ignition system works.

The ignition system of a vehicle starts with small explosions produced by igniting the mixture of gasoline and air.

The ignited mixture of gas and fuel then produces an energy-packed outburst that powers the engine to start.

The spark plug is the part responsible for providing the “spark” that ignites that explosion.

Spark is produced by the plug that comes in the form of electric current produced from the center and ground electrodes of the plug.

Without the spark produced by the plug, there will be no energy-packed explosion, which means the engine won’t have the burst of energy it needs to start.

Understanding The Different Types Of Spark Plugs

Spark plugs produce electrical sparks from its electrode components; the center and ground electrodes. These electrodes are made from different materials, precious metals that have different melting temperatures.

On that note, spark plugs are categorized into several types. To learn more about these various types of plugs, they are described below.

1. Copper Type of Spark Plug

A copper spark plug is a type that features a core made of solid copper and nickel alloy center electrodes that usually have a 2.5-millimeter diameter, which is the largest in plugs.

In spark plugs, the smaller the diameter of the electrode, the lesser voltage it needs to produce a spark. This means that this spark plug type requires a good amount of voltage to deliver the ignition the engine needs to start.

The nickel alloy electrode on this type of spark plug wears out faster compared to other materials. That is why the sharp edge on this type of plug easily gets deformed, reducing its mileage.

Copper plugs work well with vehicles with low voltage DIS, which is why they suit older vehicle models the best—using this plug type on vehicles with more demanding energy DIS is not recommended because it will greatly reduce its service life.

2. Single Platinum Type Of Spark Plug

With a design almost like the copper plug, a platinum spark plug features a platinum disc welded on its center electrode tip.

This is because platinum is a precious metal with more density than nickel alloy, extending this type of plugs mileage, which can go up to more than 100000 miles.

This plug type runs on higher temperatures, making it suitable for newer vehicle models that demand more DIS.

However, with the high temperatures produced by this plug, it eliminates the possibility of having deposit buildups, making it vulnerable to fouling.

3. Double Platinum Type Of Spark Plug

Specifically designed to eliminate waste DIS, the double-platinum spark plug is a type where the spark transfers from the center to the side electrode.

It works in a way that the electrical pulse it produced returns to the ignition coil that makes the spark retransfer to the center electrode. Working with the cylinders of the engine, the DIS is not wasted.

This is a type of plug that works well with high-performance vehicles with more needs. It is also suitable for the newer models due to its better efficiency that can keep up with the demands that a copper plug can’t do.

4. Iridium Type Of Spark Plugs

Considered as the latest and most recent type of spark plugs, iridium plugs feature a smaller electrode diameter.

But they have a lot of stronger electrodes because iridium is much stronger than the other precious metals. They can last 25% longer than the other types of plugs, and they have better firing efficiency.

The center electrode of this plug type has a thin wire made of iridium that allows it to maximize the firing ability for better ignition.

It is a type of spark plug that suits new vehicle models and high-performance cars that are very demanding. Its design works by igniting the fuel and gas mixture on the colder side.

This process risks quenching, but to fight off this situation, most iridium plugs are manufactured or fabricated with a U or V shape passage. This directs the potential flame quenching to be focused on the side electrode.

Things To Consider When Choosing The Ideal Spark Plugs

Having the list of the top spark plugs in the market and equipping yourself with the basic knowledge on the said automotive part is not enough to guarantee you the right decision to pick the best one.

It will help to greatly increase your chances of getting the best suitable one for your car but to be able to come up with a smart decision.

You might need to consider a few significant factors, learn more about them on the list below.

1. Determine The Type Of Spark Plug

One of the most important things to consider before buying a plug for your car is the plug type.

You first have to think about what type of spark plug your vehicle requires. This is because older model cars only use copper plugs, while the newer models require platinum or iridium plugs.

Storming the market and getting a spark plug without determining the right type for your car may cost you money, time, and effort.

To avoid wasting your precious time and money returning to the shop where you bought the wrong plug. You have to be sure that you know the right spark plug type your car needs.

You have to make sure that you know if it’s a copper, platinum or iridium plug.

2. The Level Of Heat Rating

Prior to making a purchase on a spark plug, you also have to think about the heat rating of the spark plug. The heat rating basically shows the exact range of temperature the spark plug will work efficiently.

It is the temperature parameters where the plug will deliver its optimum performance. The higher range of heat rating means the plug will have no problems working optimally in cold temperatures.

So, you have to make sure that you choose a spark plug operating between low and high heat rating. This will also depend on your car’s heat rating requirements.

If you are unsure, you can consult a mechanic to determine what spark plug heat rating will best work for your car.

3. The Gap Between The Electrodes

The electrode gap in spark plugs is vital when it comes to an engine’s performance.

The reason behind this is because it will give you an idea of the magnitude of the spark that the plug can produce. It will also have an effect on gas and fuel combustibility.

So, if you are going to pick a spark plug for your car, you have to choose between a wide and narrow electrode gap.

Determining your car’s ignition requirements will also help you pick the electrode gap, a spark plug will have. In this case, choosing the spark plug will still depend on your car’s specific needs.

So, be sure to be aware of your car’s needs.

Conclusion

You are now fully equipped with the proper spark plug knowledge, additional information, and you have a list of the best spark plugs in the market.

I’m sure that you’re now finally ready to go to the market and pick the best ideal spark plug for your car. You have all the resources that you need, and all you have to do now is to use them to come up with a wise decision, picking the right one for your car.

Written by Yusuke Kohara

Hi there! My name is Yusuke. I write about automotive topics for Car Proper. I love cars and have a passion for writing helpful articles on tools, car accessories, and how-to to help my readers solve their problems. In my spare time, I'm either working out, reading the book, or spending time with my family. I also work for a digital consulting agency.

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