Best Spark Plugs Reviews (2020)

Posted: 11 March 2020


Since the invention of the automobile, spark plugs have been a crucial aspect of a properly operating engine. As time progressed, they have evolved into much more heavy-duty components that work exceptionally well with light to heavy-duty vehicles.

Whether you are looking for high-performance spark plugs or regular everyday use spark plugs, there is definitely a spark plug that will fit your needs. Before we dive deep into the best spark plugs you should buy, we’re going to cover some basics in order to help you be aware of what choice is right for you.

Replace Spark Plugs

Types of car spark plugs

There are three types of spark plugs that are currently on the market. The three are:

  • Copper core spark plugs
  • Iridium spark plugs
  • Platinum spark plugs
  • Double platinum spark plugs

Despite their relatively simple structure, there are some crucial aspects in which spark plugs can differ from one another. Generally, the design is usually very similar, and most of the models have a standard arrangement of the caps and electrodes. However, there are some exceptions that have, for example, a specific 4-point electrode structure.

In most cases, the differences are not found in the area of construction, but of the materials being used to produce them.

The electrode, as well as the cap, can be made of copper, iridium, or platinum.

  • Copper is the original material that a spark plug was made of, and still the most basic on the market. Some people tend to choose them because usually, they are the cheapest ones. Costing anywhere between 1-3 dollars per plug, you can expect to receive 20,000-40,000 miles per use.By far the longest conductors, you are capable of getting the best performance out of them. However, in more modern vehicles, copper spark plugs have been usually replaced with iridium or platinum ones.
  • An iridium spark plug is made of a much less conductive material. Because of this, it operates optimally at a much lower temperature, lasting an average of 40,000 – 60,000 miles (compared to copper). Performance of an iridium spark plug is not as excellent, but longevity is by far the greatest when compared to copper.
  • Platinum, much like iridium, operates under lower temperatures. Although prone to overheating, they can last two times longer than ordinary copper spark plugs. Performance may be down, and these models will enable you to get the most out of them before having to get a new pair.
  • Double platinum spark plugs are improved versions of single plated platinum plugs. A MUCH longer lifespan and improved engine performance are what make these plugs very good. Again, not the best conductors but by far the highest durability you can get from any set of plugs.


In the past, even moderately worn spark plugs had a noticeable effect on engine performance. But onboard computer control systems can compensate for a lot, including borderline spark plugs.

In many cases, the plugs have to be extremely worn before they will cause a noticeable misfire.

The problem is if left unserviced, worn plugs can cause major issues. For example, the metal portion of the plug can weaken over time. In extreme cases, this fatigue may cause part of the device (usually the electrode) to break off and enter the engine. When this happens, extensive damage to pistons, valves, and other internal components may occur. Bad plugs can also damage sensitive onboard electronics, such as coil packs.

So, the moral of the story is, do not wait until your engine is running rough to change your plugs.

Also, do not base your service interval solely on the look of the plugs. Instead, replacement should be performed according to the manufacturer’s recommended service schedule (usually found in the vehicle owner’s manual).


spark plug chart

To help you diagnose your vehicle’s spark plugs a little better, take a look at the
spark plug chart above. This chart indicates what a really bad spark plug is.


The seemingly humble spark plug plays a significant role in engine performance. When it is time to tune up your vehicle, it is imperative you have the best solutions available. That is why we have done the legwork to bring you the top spark plugs for 2018.

Do not forget – before ordering any of these products, make sure they are designed for your particular application.

Autolite APP104 Double Platinum Spark Plug
  • Full platinum tips ensure virtually no gap erosion, Works to optimize engine performance for a longer life and improved fuel economy, Necked-down center electrode fires quicker and cleaner, with less voltage for easier starts and quicker acceleration
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Denso (4504) PK20TT Platinum TT Spark Plug
  • Twin-tip technology with 11 mm platinum center electrode and 11 mm titanium enhanced ground electrode, Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress
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Bosch (4417) FGR7DQP Platinum +4 Spark Plug
  • Revolutionary surface air gap firing technology featuring four yttrium-enhanced ground electrodes delivers the longest, most powerful spark for ultimate engine performance
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Denso (3297) SK20R11 Iridium Spark Plug
  • Excellent acceleration and performance, Stable combustion during idling, Long life and high reliability
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ACDelco 41-993 Professional Iridium Spark Plug
  • Iridium allows for small, efficient electrode designs for reliable cold starting and quick acceleration, Iridium fine-wire electrode helps burn away carbon deposits on the tip of the plug as they form
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Autolite APP5224 Double Platinum Spark Plug
  • Full platinum tips ensure virtually no gap erosion, Works to optimize engine performance for a longer life and improved fuel economy, Necked-down center electrode fires quicker and cleaner, with less voltage for easier starts and quicker acceleration
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NGK (5464) BKR5EIX-11 Iridium IX Spark Plugs
  • Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling
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NGK (6953) BKR5E-11 V-Power Spark Plugs
  • Designed to operate over a much wider heat range than ordinary plugs, Resists carbon buildup and pre-ignition, High alumina ceramics for better heat transfer and electrical insulation
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NGK (4548) CR9EK Standard Spark Plugs
  • Solid copper core for greater spark, superior heat dissipation and conductivity, Longer insulator nose prevents fouling, Corrugated ribs on insulator prevents flashover, Dual ground electrodes for more consistent spark
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Spark Plug NGK 5464

This model of Iridium IX is created explicitly for high-performance vehicles because it is enhanced with many features that are helpful in achieving that aim. Firstly, the fact that iridium was used here indicates that this product is really durable. What is more, you can find a 0.6 mm electrode in it, and thanks to such a thin wire, the engine performance and power can be noticeably improved.

Apart from that, this model has a special feature, which is a set of corrugated ribs on the insulator. Such an enhancement is helpful in avoiding flashovers. Moreover, in conjunction with a triple gasket seal, it can prevent any leakage of the gas mixture that is applied for combustion inside the engine. In this way, every ounce of power can be properly extracted.

However, you should know that this product is fairly expensive and for a regular car and everyday driving, it may not be really necessary. Nevertheless, if you are really concerned with using the maximum power and performance of your engine, it can be an excellent suggestion for you.

Pros Cons
Iridium construction High price
0.6 mm electrodes May not be necessary for driving a regular car
High-performance structure
Corrugated ribs on the insulator


Spark Plug Bosch 9652

The first thing that may strike you about this spark plug is its price – it is really eye-watering.

However, it must be admitted that this product is not overpriced because you are faced with amazingly high quality here. It is mainly due to the fact that the amount of iridium is doubled in this model, and you can find it both in the cap and the electrode. As so much iridium is utilized in that plug, both the surprising cost and the amazingly high performance are understandable.

Moreover, such construction provides a surprisingly long life to this device as well. Namely, it can work for as much as four times longer than a standard copper spark plug in a car. The producer is so sure about the high performance of this model that you are provided with a 7-year satisfaction guarantee.

This spark plug should be perceived as a long-term investment. It may look expensive, but if you divide the price by the years of service you will get, it does not look so discouraging anymore.

Pros Cons
Amazingly high performance Very high price
Double amount of iridium
Long lifespan


Spark Plug Champion

In fact, there is nothing specifically innovative about this product. Generally, it is a very basic model with copper construction. Nevertheless, it should be mentioned that it is nicely put together, and it is enhanced with anti-corrosion resistance. This spark plug is strong and dependable, so you can expect it to have a long working life.

If you have an older car, it may be a magnificent suggestion for you. It is because of the fact that some vehicles produced a long time ago may need specifically a copper spark plug. This model is really cheap, and at the same time, it is well-made and provides you with high-quality performance and a long lifespan, so it is a great value for money.

Pros Cons
Low price Copper as the primary material
Compatibility with older vehicles


Spark Plug Denso 5304

You may be surprised at the price of this product, being one of the highest on the list. However, you should take into consideration that it is also one of the premium models. One of its most important features is an incredible 0.4 mm wide electrode. Apart from that, it is enhanced with iridium tips as well.

Both of these characteristics are significant, because firstly, iridium is one of the best materials for a spark plug, and secondly, the thinner the electrode is, the higher performance you may expect.

Hence, Denso 5304 IK20 Iridium Power Spark Plug can provide you with excellent fuel efficiency, but such a high-quality product needs an adequate price. Nevertheless, if you can afford such an advanced model, you will definitely not be disappointed with the effects it will have on your engine.

Pros Cons
Laser construction Expensiveness
Very high performance
High quality


Spark Plug NGK 7092

NGK 7092 BKR6EGP G-Power Spark Plug is an excellent model with many unique characteristics.

Firstly, its electrode tip is amazingly thin, as it has just 0.6 mm. Thanks to such an enhancement, engine performance can be highly increased. Another essential feature of this product is that it is constructed with laser welded platinum.

What is more, this spark plug is enriched with uncommon insulator noses that are designed particularly for throttle response improvement. All in all, it is quite a high spec plug that can be bought at a relatively low cost.

Hence, if you want to achieve the highest engine performance available, but at the same time, you do not want to pay a lot, NGK 7092 BKR6EGP G-Power Spark Plug is certainly an excellent choice.

The only disadvantage we could think of is that it is a single plug with a single platinum layer being applied, but it works perfectly fine, so there is nothing to worry about.

Pros Cons
Platinum construction Single platinum being used
Thin tip Single Plug
High durability
Insulator noses of unique design

10. NGK CR9EK Spark Plugs

NGK Spark Plugs

NGK is infamous for their wide range of spark plugs. With so many to offer, we narrowed it down to their best products.

Having the highest conductivity of any type of spark plug, you can also expect to receive the best performance. Having the core made of copper, you will get the shortest life span, which is a sacrifice you will have to make for the best top-end performance.

Dual ground electrodes allow for a more consistent spark, along with the triple gasket seals eliminating combustion gas leakage. This spark plug type is ideal for motorcycles and similar all-terrain vehicles like ATV’s and Four Wheelers.


Pros Cons
Long service life for a copper core Not ideal for most automotive applications
Powerful spark

9. NGK BKR5E-11 V-Power Spark Plugs (Best Value Spark Plug)

Another NGK spark plug is in our top 10 list, but this time it’s a more cost-effective plug. Costing around 2 dollars for each spark plug, the copper core is excellent in withstanding heat. The long, hardened porcelain nose insulates the copper core, at the same time, also prevents fouling.

Put these in any ordinary vehicle and begin to notice a smoother idle, smoother acceleration, and even better fuel economy. Again, these last about 20 to 30k miles before needing to be changed.It can be a good suggestion for anyone, but primarily for vehicles that are low performance and everyday commuters.


Pros Cons
Inexpensive Limited service life
Exceptional performance Requires gapping

8. NGK BKR5EIX-11 Iridium Spark Plugs

Spark Plug BKR5EIX-11 NGK

Stepping it up to an iridium spark plug, NGK’s BKR5EIX-11 spark plug is for somebody who wants to reduce the replacement frequency of the spark plugs.

With some performance enthusiasts in mind, these sets of plugs are more durable, suitable for performance vehicles, and help to sharpen up the engine’s idling and driving characteristic (although this varies for each vehicle).

Iridium is a very hard retrial, the .6mm laser welded fine conductor tip will last an average of 40,000 to 60,000 miles before needing to be replaced, making it ideal for the “set it and forget it” crowd. Not the cheapest set of plugs costing about 6 to 7 dollars each, this is all because of the longer life span you will get in return.


Pros Cons
Great for performance applications Improved throttle response and extreme ignitability
Short service life compared to other iridium plugs Pricey

7. Autolite APP5224 Double Platinum Spark Plugs

Spark Plugs Autolite

Coming in at number 7 for our top 15 spark plugs list, Autolite APP5224 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.

The lifespan of these plugs is exceptionally good, lasting anywhere between 40 and 80 thousand miles (sometimes even much more).

That is not bad for a cost of about 4.7 dollars per plug!


Pros Cons
Double platinum Pricey
Long service life

6. ACDelco 41-993 Professional Iridium Spark Plugs

Spark plugs ACDelcoMoving down to our number 6 contestant for the best spark plugs to buy, ACDelco’s (41-993) Professional Grade Iridium Spark Plugs. These spark plugs cost about 5 to 6 dollars each, are designed to last longer than the ordinary copper core and even some platinum-coated plugs. As a credible brand they are, they have introduced this spark plug as an excellent source for regular commuter and sports cars alike.

Because they are iridium, your vehicle can experience better engine idling stability, smoother acceleration, and a longer lifespan (compared to copper core plugs). The small iridium coated electrode is more efficient, which improves cold starting and quicker acceleration.

Highly recommended for any vehicle they can become compatible with.


Pros Cons
Reliable cold starting and excellent acceleration Mostly for General Motors applications
Long service life

5. Denso SK20R11 Iridium Spark Plugs

Spark plug Denso

Dense is not new to the spark plug market. In fact, they took the number 5 spot in our best spark plugs to buy today. In specific, the SK20R11 model is an iridium coated plug which has far greater longevity compared to copper cored plugs.

Switching over the Denso’s SK20R11 plug, you will be able to experience excellent acceleration, much smoother engine idle, increase fuel economy, and overall engine performance.

Due to the tiny iridium coated ignition electrode, quick starts are easier to achieve using less electricity. This iridium material has a higher melting point, making them excellent for lasting at the very least 40K miles. That makes these reasonable plugs about 7 dollars per unit!


Pros Cons
Exceptional performance At about $7 a pop, they are not the cheapest plugs
Long service life

4. Bosch FGR7DQP Platinum +4 Spark Plugs

Spark plug Bosch FGR7DQP

Bosch is known for its well-built power tools, automotive exterior accessories like wiper blades, and also their engine performance products like oil filters and spark plugs.

In specific, Bosch 4417 Platinum +4 Spark Plugs are made to be unique compared to ordinary plugs.

The electrode gap is factory set to provide ease of installation, never requiring any adjustment. Instead of a single electrode arch, this plug has four yttrium-enhanced ground electrodes that provide optimum access to the air/fuel mixture for the most efficient combustion.

Platinum makes for a much longer life span for the spark plug; however, performance will not be maximized using this spark plug. With that being said, it is not night and day noticeable.


Pros Cons
German-engineered performance and efficiency Well priced
Limited service life

3. Bosch FGR8DQI Platinum IR Fusion Spark Plugs

Spark plug Bosch FGR8DQIVery similar to the Bosch spark plug mentioned above, the 4501 Platinum IR Fusion model is yet another middle-priced plug.
The iridium and platinum infused center electrode makes an excellent conductor for quicker sparks and better performance.

Three gap electrode arches make the spark happen using fewer wires, which in turn, enable you to have smoother start-ups. Installation is very easy, and fitment works with a lot of vehicles.


Pros Cons
High-performance Design is overly elaborate for basic applications
Long service life

2. Denso PK20TT Platinum Spark Plugs

Spark Plug Denso

Moving down to our number 2 most recommended spark plugs to buy today, we have Denso’s PK20TT Platinum TT Spark Plugs. Twin tip platinum 11 mm center electrode and 11 mm titanium enhanced ground electrode improves fuel economy and acceleration. Also, faster start-ups can be experienced by switching to these particular spark plugs. It is essential to understand how to change spark plugs properly to ensure perfect engine operation.


Pros Cons
Double platinum Sometimes, the gap is not set correctly

1. Autolite AL104 Double Platinum Spark Plugs (Best Spark to get)

Spark Plug Autolite

Moving down to our #1 best spark plug you should consider buying, there are Automate APP104 Double Platinum spark plugs.

Unlike with regular single platinum plugs, these double platinum plugs are able to withstand MUCH longer engine operation. On the top of that, durability is drastically increased with the full platinum tips on the center conductor and side electrode arches.

With necked-down center electrodes, these spark plugs are able to fire quicker and cleaner, using less voltage for start-ups, faster acceleration, and even better fuel consumption. The overall life of these types of spark plugs is two or three times more than copper core design. For high-performance requirements, the double-platinum spark is the way to go.

This means that the Autolite Double Platinum plugs receive fair pricing at around 4 to 5 dollars per plug.


Pros Cons
Dependable, reasonably priced None
Long service life


For those who don’t want to read an entire article devoted to spark plugs, we’ve comprised a handy-dandy summary.

The best copper core spark plugs:

The best platinum spark plugs:

The best Iridium spark plugs:

The best value spark plugs:

The best spark plugs for performance

What’s the best spark plug of all?

Best spark plugs FAQ

Spark plugs may deceptively seem very simple, but in reality, they are crucial for our engine to run smoothly.

You should keep in mind that because of their failure, the fuel efficiency can be reduced by as much as 30%.For this reason, it is crucial to change your spark plugs on time and never let them affect the performance of your car negatively.

In order to choose the best products, you need to understand how they work, how to manage them, and how to notice the signals that a particular model may be ideal for your vehicle.

➡️ How do spark plugs work?

It may seem that these items work very easily – you just plug them and they spark, as the name suggests. However, in fact, it is a bit more complicated. Most importantly, it is a fully electrical device. In a typical engine, it is plugged into a cylinder head. Around this cylinder head, there is a mixture of fuel (gasoline) and air. This is the material that the spark plug needs to ignite in order to improve fuel efficiency. As a result of this tiny explosion, a piston fastened to a crankshaft is driven to transmit the energy (with the use of some more connections) to your vehicle’s wheels and propel it in this way.

It is just a simplified description of how this process works; nevertheless, you can see that you need to change your spark plugs on time because they are crucial for the proper propulsion. If there is no spark, there is no combustion, and without it, an engine cannot work. Also, please note that it is different in the case of diesel engines, because of glow plugs being used in them instead.

➡️ When should I pick cold or hot spark plugs?

You should remember that spark plugs can be designed in two different ways. A cold plug will have a cold electrode tip, and a hot plug will have, accordingly, a hot electrode tip.

In order to choose the right one in a particular situation, just follow the rule of the opposites. On a sweltering day, a cold plug will be better to use. What is more, you should pick it for a high-performance engine or an engine with high RPM. When the tips are cooler, they can work at a lower temperature, and the plug can eliminate the excess heat from the engine more effectively.

As you can expect, hot plugs are the exact opposite. Thanks to the fact that they are created to work with hot tips, so they are always amazingly warm, even despite the fact that the air transmitted to the engine might be cold. It is significant because if the plug is used in an environment with too low temperature, the combustion taking place in a cylinder head will not provide as good effects as it could have. Such a situation can have an impact on engine performance.

Moreover, it can also cause deposits to build upon the plugs, and it may reduce the lifespan of those parts.

In many cases, drivers do not have to worry about the difference between hot and cold spark plugs that much, unless they are focused on achieving the highest engine performance available. However, if you live in a place where the temperatures are extremely high (Florida) or remarkably low (Alaska), then you may need to replace your spark plug with the right one. In those instances, the effects of using the appropriate type of spark plug can be really noticeable and have a vital impact on fuel efficiency.

➡️ How to inspect and change your spark plugs?

Fortunately, it is not very hard to replace your spark plug. In order to make sure if you need to change it, you should take it out and take a look at it to judge what the condition is, in your opinion. There can be, basically, three situations:

  •  The spark plugs appear all right – provided that the engine performance and fuel
    efficiency are at the right level as well, everything is okay, so you can put them back and start using your
    car again.
  • There is some red coating – if the engine performance seems fine, but you have
    noticed some red coating on your spark plugs, there is nothing to worry about either. These are simply the
    leftovers that cheap gasoline additives leave. All you may need to do then is just clean your spark plugs
    with a cloth and mount them back
  • Plug wires look worn – if you notice that the plug wires are, for example,
    definitely more brittle or thinner than they were initially, it may indicate that it is the time to replace
    a spark plug.

Generally, you should pay attention to the electrode tip. Those thin little wires are the actual working parts of spark plugs, so they are taking the most punishment, and by their condition, you can correctly judge the state of the whole element. When they clearly show that spark plugs may require changing, you should not postpone it, because otherwise, you can lose your full fuel efficiency.


In addition to using spark plugs, the carbon build-up can occur on the tips, which often causes them to go wrong.

Use a high-quality fuel injector cleaner to make sure this issue stays away. Along with that, octane boosters help to make the fuel burn slower (see our octane booster guide ), and OBD2 scanners can help you determine which cylinder is having misfires due to worn plug(s).

Making sure your engine is breathing clean and fresh air is absolutely crucial to get the most out of your vehicle’s spark plugs. Be sure to see which engine filter is best to use with your automobile. Always ensure your car is in the best of health and make sure it has brake pads that are up to standard.