Top 10 Best Spark Plugs- (Reviews & Buyers Guide 2019)

Spark plugs are one of the most crucial elements of engine maintenance, yet most drivers are completely unaware of this piece of hardware. Spark plugs facilitate the ignition of the air and fuel mixture as efficiently as possible. Worn, old, and dirty spark plugs will reduce your engine’s capacity to adequately perform. Putting in the right spark plugs will ensure your engine runs cleaner, smoother, and utilizes less fuel.

The spark plug is where combustion in your engine begins. They give the spark that ignites the mix of fuel and air in the combustion chamber. Also, spark plugs effectively give off heat to help the vehicle’s cooling system. It is crucial to keep your spark plugs in good condition since bad spark plugs can result in poor performance, decreased gas mileage, and engine misfiring. Always make sure to replace your spark plugs at the first sign of trouble so you can save yourself money and your car many problems in the long term.

The below spark plugs are some of the best on the market and incorporate the latest materials and technology. They can reach a high level of durability and performance with few compromises in quality. Spark plugs ability to increase your engine’s level of performance makes it well worth the extra expense.

Top 10 Best Spark Plugs

  1. NGK Platinum Spark Plug

With over 8 decades of experience, NGK is one of the biggest names in spark plugs. Years of experience creating specialized sensors, connectors and other car engine components have helped earn NGK a reputation as a trusted brand noted for quality and consistency.

The NGK Platinum Spark Plug is the best option that you can get on the market right now as it is designed to deliver on performance. Well, if you are a performance enthusiast, then this is a nice option for you to get at the moment.

Those who have used it all claim that it is able to deliver on having better ignition, throttle repose, and no more fouling of the engine. Generally, you will find it being one of the best to buy at the moment.

You will also get that the product is able to deliver on the impressive performance generally. This ensures that you get to enjoy better durability and consistency when it comes to performance. As a result, you will find it being worth the price.

The product also features a longer insulator nose. This is meant to prevent fouling. You will also find it having corrugated ribs on the insulator. This in turn prevents cases of flashover. You can now see why more would want to get it for their engines.

  • It has a high melting point
  • It has a longer insulator nose
  • It is a performance spark plugs
  • Ideal for the DIY enthusiast
  • It has a long life span
  • Improved performance from V-Power electrode

  • A few fitment issues
  • Not ideal for all applications
  • NGK Iridium IX Spark Plug

  • The NGK Iridium IX Spark Plug is designed with a solid copper core to produce a greater spark. The spark plug’s copper core also gives it superior heat dissipation and conductivity. More than that, this spark plug is built to perform with its dual ground electrodes that also provide a more consistent spark.

    These plugs are a great option if your plugs need changing and and the manufacturer recommends iridium. Like all NGK plugs, they are very well made and you are almost guaranteed they will perform well. One thing to note, if you do buy these plugs, make sure the gap is set properly before fitting them.

    This durable little spark plug will benefit and protect your car with its triple gasket seal that eliminates combustion gas leakage and its zinc dipped shell which prevents corrosion. Before getting this premium spark plug, you’ll have to determine if it’ll fit your vehicle by entering your vehicle’s details on the product page.

    • The NGK Iridium IX Spark Plug has a Good reliability
    • It has a stable combustion
    • The acceleration of this spark plug is excellent

    • Does not fit some common car models
  • Autolite Double Platinum Spark Plug

  • Coming in at number 3 for our top 10 spark plugs list, Autolite Double Platinum Spark plugs offer much greater durability than your ordinary copper core, iridium, and even single plated platinum plugs.

    Unlike single plated platinum plugs, this spark plug has a platinum coated core, platinum electrode, and even platinum conductor arch. This all results in much quicker sparks, less voltage for easier start-ups, quicker acceleration, and better fuel consumption.

    Lifespan of these plugs are exceptionally good, lasting anywhere between 40 and 80 thousand miles (sometimes, much more). Due to its full platinum tip, this plug ensures a virtually nonexistent gap erosion, which is great when considering how often such a thing can occur.

    This plug also works to optimize engine performance by aiding with its fuel consumption over time. At the same time, we should point out that its necked-down center electrode is built in a way that fires quicker and cleaner with less voltage than a regular plug would need.

    • It is a durable and double platinum spark plug
    • It has a long service life
    • It is affordable

    • It may not fit some models of cars
    1. Bosch Platinum Spark Plug

    Bosch who is known for making quality power tools and kitchen appliances. The Bosch Platinum Spark Plug is quite an impressive product, being loaded with handy features and having a convenient design.

    The spark plug boasts its revolutionary surface air gap firing technology which features four yttrium-enhanced ground electrodes that deliver a long-lasting, powerful spark for the ultimate engine performance. Along with that, the spark plug’s four yttrium-enhanced ground electrodes provide optimum access to the air/fuel mixture for the most efficient combustion.

    This spark plug contains an electrode gap that is factory set to provide ease of installation. You won’t have to constantly adjust the gap on this spark plug as it is not a requirement. Feel free to easily install this spark plug right into your car and get it running smoothly!

    • The Bosch Platinum Spark Plug has a good performance
    • It is relatively affordable
    • Ease of installation
    • It doesn’t requires gapping

    • This plug may not fit into some car models
    1. ACDelco Professional Iridium Spark Plug

    From AC Delco comes the Professional Iridium Spark Plug line. Featuring the latest technology available, these plugs are designed for very long life, stable idle, smooth performance and maximum efficiency—all while meeting or exceeding factory specifications for quality and durability.

    AC Delco is one of the most recognized names in auto parts, and the Professional Iridium plugs are an ideal replacement for most modern vehicles. The iridium components allow for use of a smaller and more efficient electrode, which helps with cold engine startup. With reduced voltage draw on the ignition system, these plugs can even help keep your engine running better, for longer.

    More new vehicles than ever are using iridium spark plugs, and AC Delco Professional Iridium spark plugs put the technology to work for you. These plugs also feature a built-in suppressor to help block radio frequency interference which can affect vehicle electronics. These plugs are also easy to use as they come pre-gapped from the factory, saving a step for do-it-yourselfers. Many owner reviews comment positively in the quick and easy installation.

    • Latest technology for smooth and efficient performance and long life
    • Ideal for smoother cold starts
    • Reduces strain on other ignition system components

    • May not be ideal in all applications
    • Higher up-front price than some other alternatives 
    1. NGK Standard Spark Plug

    The NGK Standard Spark Plug is another good performance product on the market. It is good in terms of overall performance coming from such a top brand.

    It is made from strong materials that can assure the user of ending up with some good performance generally. In the end, you will find that it is possible to end up with a product that works really good.

    The product is also good in terms of having a longer insulator nose. As a result, it is able to prevent cases of fouling. There is no doubt you are going to have some good time working with such type of spark plug.

    In addition, this product is excellent when it comes to having corrugated ribs. This helps to prevent flashover. Having the dual ground electrodes is there to promote having a consistent spark. Ultimately, you now have a spark plug that works good as compared to the other options on the market.

    Since the product does come with a triple gasket seal, it is able to eliminate combustion gas leakage. This definitely makes it good to have a vehicle that drives better.

    • It has a longer insulator
    • It has Corrugated ribs
    • It is a dual ground electrodes spark plug

    • It is a bit pricey compared to other plugs on the market
    1. NGK 6619 Iridium Spark Plugs LFR6AIX-11

    When it comes to ease of installation, the NGK 6619 Iridium Spark Plugs LFR6AIX-11 stand tall on the market. The design and overall construction allow it to perform well even over a wide range of heat. As a result, you will find it being better than some ordinary plugs.

    Another thing is that the spark plug is able to resist carbon build up, which enables it to function without failure. Also, it is able to resist pre-ignition. In the end, you have spark plugs that work great on the basis of performance.

    The spark plug have high alumina ceramics which are good for transferring heat. You will now be in a position to enjoy using it for better driving experience. The spark plug also features good electrical insulation to keep it working great.

    The product also features a triple gasket sealing process. This eliminates the chances of ending up with gas leakage.

    • The performance is excellent
    • This product resists carbon build up
    • It is constructed using strong materials

    • Not the best for a Tacoma
    1. Denso (4504) PK20TT Iridium TT Spark Plug

    With the Denso 4504 spark plug, you are getting a spark plug made from the most durable and long lasting material: iridium. Iridium is much stronger than platinum and ensures that your plug will have the longest life possible.

    Thanks to the excellent design and composition, you do not have to worry so much about the electrode wear. It is recommended that you get your Denso spark plug serviced every eighty to one hundred thousand miles. This brand of spark plug includes a competitive warranty and is consistently rated as one of the most durable spark plugs.

    It features twin tip platinum 11mm center electrode and 11mm titanium enhanced ground electrode which improve spark efficiency. Results such as improved fuel economy, acceleration, and faster start-ups can be experienced by switching to these particular spark plugs

    • Wide variety of fitment options
    • Platinum plugs run ‘hotter’ for a continual self-cleaning effect
    • Durable construction for long life and consistent performance

    • May not be available for certain applications
    • Platinum construction not ideal for all engines.
    1. NGK (6418) BKR6EIX Iridium IX Spark Plug

    Also from NGK, the BKR6EIX Iridium IX spark plug features affordable pricing, a wide range of applications, and a variety of unique features designed to improve performance and durability.

    Designed for affordable and durable use in a wide range of engines, the NGK (6418) BKR6EIX Iridium IX spark plugs are a top spark plug pick for value-minded shoppers. These plugs also feature solid-state suppressor, to reduce radio frequency interference. Reviews indicate that many shoppers are delighted with the restoration of smooth performance and improved fuel economy.

    The extreme performance of the NGK (6418) BKR6EIX Iridium IX spark plugs ensure a forty thousand to fifty thousand mile service life. This spark plug was built with a precision laser-welded electrode construction and designed for turbocharged engines. The fine-wire Iridium nickel-alloy ground electrode and center electrode gives it a lot of torque and horsepower. Plus, the trivalent metal plating ensures superior anti-corrosion and anti-seizing qualities. Make sure to get your NGK spark plug checked at least every sixty thousand miles.

    • It has a long life span
    • It is a secure fit spark plug
    • It has a superior spark

    • Other plugs may offer more features
    • Not available for all applications.
    1. NGK 3403 NGK G-Power Platinum Spark Plug TR55GP

    An ideal replacement plug for numerous applications, including modern high-efficiency and high-performance engines, NGK’s high-end G-Power Platinum spark plug TR55GP combine nothing less than the latest innovations for superior performance. Highly rated by customers and available for numerous applications, these are the world’s leading platinum plugs—and come with a strong reputation backed by stellar customer reviews.

    With laser-welded electrode tips, enhanced durability via special anti-corrosion properties, and an OEM-approved design, NGK G-Power Platinum spark plug TR55GP utilize high-precision construction and numerous innovations to provide one of the best spark plugs on the scene for today’s demanding engines.

    This model was recently redesigned to keep up with advancements in the cylinder head and fuel efficiency technology. In addition, these copper-core plugs come with conventional ground electrodes that give you increased thermal conductivity.

    • This spark plug is constructed with top quality materials
    • It is precisely built or constructed
    • Numerous innovations for improved performance and long life

    • It is a bit pricey
    • May not be available for all applications

    Spark Plugs – The Buyers Guide

    Below are the things you need to look out for when buying a spark plug for your vehicle:

    Find Your Vehicle’s Specs

    Before you begin a search for spark plugs, you need to know the specs of your vehicle. In your vehicle’s owner’s manual, there should be a section for buying and gapping your vehicle’s spark plugs. This section should tell you exactly what type of spark plugs you’ll need for your car. If you don’t have a manual, then you can also check under your car’s hood for metal tags which give this information. However, if all that fails, then your vehicles spark plug specs can easily be found by searching online.

    If you can’t get the specs to your car from your vehicle’s manual or information plates, then you’ll have to know some information in order to get the specs. You are going to need to know the make and model of your vehicle, the model year, the type of engine, the number of cylinders the engine has, and the engine displacement of the engine.

    Understand The Types

    It is always important you understand the different types of spark plugs in the market. You have to consider getting yourself one that will deliver on the best performance. The common options include iridium, platinum, copper core, and double platinum.

    The iridium option is generally good. This type is considered to be good in terms of high performance and also longevity. Well, you can also expect them to be also experience because of such performance. Do not go for the copper core types unless you have a carburetor type of car.

    The size

    Another thing you have to look at is the size. The different vehicles will differ in the engine design and size. This means that the plugs that you choose should be able to deliver on good performance and fitting for your specific car.


    You definitely have to look at the quality. It is crucial that you get to pick a model that comes with the best quality. No one wants to end up with a product that cannot guarantee the best performance on overall. It is the reason you might want to get yourself a product from a top brand. At least you will be sure that the quality will be good.


    What is a Spark Plug?

    In simple terms, a spark plug is a small threaded metal component that features conductive metal components separated by an electrical insulator. The spark plug assembly has a terminal at one end, an electrode tip at the other. In between are a set of threads that allow the spark plug to be tightly installed into special openings in the engine’s cylinder head, typically, with one spark plug per cylinder. An electrical current is supplied to the spark plug, which causes a brief electrical arc, or ‘spark’, to form between the two electrodes, which sit in the cylinder. This spark ignites the air and fuel mixture within, kicking off the explosion that drives the engine.

    How does a Spark Plug Work?

    When a spark plug is threaded into the engine’s cylinder head, a spark plug wire or ignition coil is mounted to the terminal side of the spark plug and the electrode tip sits inside of the engine’s combustion chambers, or cylinders. The spark plug is mounted rigidly in place, and a small gasket helps to form a tight seal, ensuring that none of the pressure created by the combustion process is allowed to escape. The vehicle’s ignition system send a precisely-controlled electrical current through the spark plug, with extremely precise timing. When this current is introduced, it flows through the plug, and ‘jumps’, via a visible spark, between the electrodes in the spark plug tip.

    How often do I need to Change my Spark Plugs?

    Spark plugs have a finite lifespan that depends on numerous factors. In most modern cars, spark plugs need to be changed infrequently, perhaps every 80,000 or 100,00 miles. In certain applications or with specialty vehicles, this interval may be much shorter and some high-performing cars or custom-built performance engines may require new spark plugs more frequently. In racing engine applications, spark plugs may need to be changed almost daily.

    What Kind of Spark Plug Do I Need?

    Spark plugs come in many shapes, sizes and variations—even if they all look similar and function in the same way. You’ll need to select spark plugs based on their physical dimensions to ensure they fit and function properly with your ride’s engine. Spark plugs are typically made for specific applications with very precise physical characteristics and heat ranges. From that basis, many spark plugs are offered with unique features based on the design of their electrodes, the materials used in their construction, and more. In fact, there are over a dozen spark plug variations, simply based on the design of their electrodes.


    An engine’s primary function is to provide the power required to make the vehicle move. This power is produced when the compressed fuel is ignited. In order to cause this ignition of the fuel, the engine is equipped with a small but very much needed component: The spark plug. It is our expectation that the above review will enable you to make an informed decision.

    Our top pick out of the 10 best spark plug reviewed is the NGK Iridium IX Spark Plug. The reason for picking this spark plug is that it is designed with a solid copper core to produce a greater spark. In addition, this spark plug is built to perform with its dual ground electrodes that also provide a more consistent spark.


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