Best Spark Plugs In 2020 | Reviews & Comparision

Spark Plugs

Are you looking for best spark plugs ever? While it is a chore for most users to navigate the car anatomy, spark plugs are fairly easy to replace on your own. They are crucial to the proper functioning of your car and require to be regularly maintained. If you feel that you need to replace your spark plug, then I hope this review helps you in making a choice.

Bestselling Spark Plugs On The Market

performance spark plugs
  • NGK CR9EK Spark Plugs
  • Dimensions : 0.1 x 0 x 0 Inches
  • Material : Solid Copper Core
  • Item Weight : 1.6 Ounces
best spark plugs for horsepower
  • NGK BKR5E-11 Power Spark Plug
  • Dimensions : 0.3 x 0.4 x 1.3 Inches
  • Material : Solid Copper Core And Nickel Tipped Electrode
  • Item Weight : 0.8 Ounces
high performance spark plugs
  • AC-Delco 41-993 Professional Iridium Spark Plugs
  • Dimensions : 3.6 x 1.1 x 6.6 Inches
  • Material : Iridium
  • Item weight : 0.3 Ounces
best iridium spark plugs
  • Denso SK20R11 Iridium Spark Plugs
  • Dimensions : 3.2 x 1 x 0.8 Inches
  • Material : Iridium With High Melting Point
  • Item Weight : 1.6 Ounces
best performance spark plugs
  • Bosch FGR8DQI Platinum IR Infusion Spark Plugs
  • Dimensions : 0.9 x 1.1 x 3.4 Inches
  • Material : Fused Iridium And Platinum
  • Item Weight : 0.8 Ounces

Top Rated Spark Plug Reviews 2019

best high performance spark plugs

Product Specifications:

  • Good conductivity

  • Long Insulator nose

  • Dual ground electrodes

  • Triple gasket seal

  • Corrugated ribs on insulator

This spark plug is one of the best spark plug on the market. It works well with most motorcycles or four wheelers. While NGK is renowned for its longevity, the materials used usually enhance the performance of its products. This one does come with a disadvantage, having a copper core, though.

In-depth Review

While making this list, this is one of the first ones that came to me. This one is the spark plugs that I return to again and again when it is time for a replacement. Not that I haven’t tried out other stuff. Nevertheless, this is my favorite, and I have my reasons for it.

  • Being copper plated, they provide good conductivity. Further, this increases the heat dissipation and gives you a faster startup as well. It’s worth noting that changing the Engine oil regularly helps to minimize engine heating Not just that, you will notice a smooth acceleration during the ride. Even at the cost of longevity, the overall functioning of your vehicle is enhanced.

  • These spark plugs are built to resist fouling. This is due to the longer nose provided on the insulator. You can rest assured that by using these spark plugs, you can avoid flashovers as well. This is because of the corrugated rib design of the insulators.

  • I immediately noticed a steadier spark while using these plugs. This works because the spark plugs are built with dual ground electrodes. One of the primary worries about a gas leakage is completely negated as well by the triple gasket seal. Even with having a shorter life span as compared to platinum-cored ones, a zinc dipped shell prevents excessive corrosion.

  • However, as I mentioned before, one of the primary and probably the only disadvantage would be the life span of the spark plugs. It can be a bit above average when it comes to the price as well. However, it does deliver what it promises.


  • Fast start up and easy acceleration
  • Resists Fouling
  • Resists Flashovers
  • No combustion gas leakage
  • Resists Corrosion


  • Shorter life span
  • Bit above price range for many

Final Words:

Overall, I am pretty comfortable with this one for my motorbike. Changing it relatively frequently is not an issue for me. I hate having to kick-start my bike several times for it to work but using this one made it loads easier to do so. And I like the way my bike runs after the initial startup as well. I have a friend who uses it on his car, and he has reported similar experiences as well. Check how much you can save, buying the NGK (4548) CR9EK Standard Spark Plug on Amazon

Product Specifications:

  • Long Insulator nose

  • Iridium tip that is laser welded

  • Corrugated Ribs on the insulator

  • Triple gasket

  • Trivalent metal plating

If you are more concerned with the longevity of the spark plugs, this iridium spark plugs one might suit you better. You don’t have to change this as often as the copper cored ones. Iridium has a higher resistance to corrosion as well. Even though platinum ones are better when it comes to longevity, iridium certainly has good durability to provide.

In-depth Review

  • I didn’t use this one much myself. My friend, though, swears by this one. So I asked him about his experience, and he claimed that it is so much easier to replace spark plugs when using this one. The anti-seizing feature that it claims makes it easier to remove and install the plug. So I tried it out once, and while it won’t be my first choice when it comes to NGK products, it wasn’t bad either.

  • It resists heat and corrosion caused by electricity as well. As I mentioned before as well, its good feature is the huge amount of miles it can cover before needing to be changed. And this I can attest. This is because of the high melting point of the iridium alloy.

  • The spark is not prone to frequent fluctuations either. The electrode is uniquely tapered in this one. This is beneficial because it decreases the electrical quenching. Like the previous model, this too is equipped with a longer-nosed insulator with corrugated ribs. This protects the car from flashovers. The longer nose of the insulator prevents fouling. A triple gasket seal resists leakage of the gas combustion.

  • The advantage of this spark plug model lies in the trivalent metal plating it provides. This makes it more resistant to corrosion. It also provides the anti-seizing properties I spoke about.

  • However, even though the startup is very smooth, it could be better. I guess it is because of the naturally lower conductivity of iridium. Moreover, you have to careful while purchasing this one. It might not fit your car model. That’s the mistake my friend first made.


  • Anti-Seizing
  • Resists corrosion and lasts longer all-together
  • Decreases electrical quenching
  • Stable spark


  • May not fit your car model
  • Has a lower conductivity

Final Words:

As a whole, it is not a flawless product. But that doesn’t mean that it didn’t work well for me. The mileage it provides alone blew me away. More like, I didn’t wear out the one I am using yet. So if you prefer to install it once and forget about your spark plugs for a long, long time, I would recommend this to you. Check how much you can save, buying the NGK BKR5E-11 Power Spark Plug on Amazon

AC-Delco 41-993 Professional Iridium Spark Plugs

Product Specifications:

  • Iridium Core

  • Fine-wire iridium electrode

  • One-press Suppressor seal

There is nothing more that I can say about the brand than is already known. This spark plug too has an iridium core that enhances its performance on multiple levels. You can use this one in your sports car as well as your regular vehicle.

In-depth Review

  • A mechanic told me that these spark plugs are created to be unaffected by radio frequencies that often affect the performance of vehicles. Later when I researched the product, I found that this is because of the suppressor seals in the plugs. Not just that, these seals further allow for the durability of the electrodes. They prevent leakage of gas combustion as well. I found this to be unique.

  • Moreover, the iridium core offers an easier transition when you are accelerating your vehicle. The iridium core is actually useful on a lot of levels. I found that the engine has much more consistency and idles better as well. The iridium electrodes provided here serves for a better fuel spark. And you can stop worrying about fuel loss due to carbon deposits. The deposits are burnt out by these iridium electrodes

  • Although copper offers a better one, iridium cores too, offer a good startup. They offer a longer durability as well, owing to the alloy. I found that it can last longer than even some platinum ones.

  • On a side note, be very delicate while replacing this plug. You can easily break it while adjusting your gapping. It is better if you use proper tools while for it. Or consult a mechanic. It will be really awful to purchase it and then being unable to use it. It has the usual cons of an iridium core: less conductivity. But that is usual, and it offers a lot of benefits as well, perhaps more than the usual iridium cored spark plugs.


  • Resists radio frequency
  • Durable electrodes
  • Better acceleration
  • Burns carbon deposits
  • Better fuel ignition
  • Engine idles well


  • Can be very delicate and breaks easily
  • Less conductivity as compared to copper ones

Final Words:

I tried this just once, and it was nothing exceptional. But it was good definitely. It worked well too. And the longevity was impressive. I didn’t have to change it forever as long as I used that car. And as far as iridium cored plugs go, it is certainly worth a glance for the performance. Check how much you can save, buying the ACDelco 41-993 on Amazon

best spark plug

Product Specifications:

  • Iridium core

  • Iridium tipped center electrode

  • Platinum tipped ground electrode

  • Gasket seat

This too features an iridium core. Denso is a pretty old manufacturer when it comes to spark plugs. It is one of the best as well. Not only does it provide a better durability, but the iridium core is also useful for a lot of other purposes as well.

In-depth Review

I was introduced to Denso when I sent my car to the mechanic, and they replaced the spark plugs. While using, I did experience an extremely smooth ride, and it was when I covered over 40k miles that I needed a replacement.

  • The iridium used in this spark plug can be rated above some of the platinum-cored plugs as well. You can race under the most extreme speeds, and it won’t affect this spark plug. The platinum tip in the ground electrode in combination with the iridium tipped center one creates one of the hardiest combinations ever.

  • You further get a smooth acceleration. The engine idles better due to this as well. And you save a lot of fuel. As we are all concerned about the fuel wastage in our cars nowadays, we search for new ways to overcome this. And these iridium cored spark plugs do help a lot on this issue.

  • The iridium electrode provides a more efficient startup and uses the minimum amount of electricity as well. You can easily cover a staggering amount of miles with this one fitted in your car. Iridium has a high melting point, and that makes it highly resistant to corrosion.

  • However, the gapping in these spark plugs is pre-configured. So if you fit them in yourself, you may find that it doesn’t fit your vehicle. You can easily adjust it a bit, though. I recommended this to a friend as well and assisted him in the installation. The process seemed hassle-free and was done pretty quickly.


  • Easy to install
  • Smooth acceleration
  • Uses less electricity during start up
  • Resistant to corrosion
  • Saves fuel


  • Less conductivity when compared to copper cores ones
  • Pre-configured gapping may require a bit of adjustment

Final Words:

The mileage was great. But I have known spark plugs that offer better ones. This plug is good as well. But it is nothing exceptional. I didn’t like the pre-configured gapping thing, and it was good that mine was fitted by the mechanic. The platinum tip of the ground electrode is a nice support to the iridium the of the center one, though. And I liked the overall effect it produced during the drive. What I loved was the smooth installation. Honestly, it is a pleasure to tweak my car, or in this case my friend’s car. And an easy procedure makes it all the more better. Check how much you can save, buying the Denso (3297) SK20R11 on Amazon

Bosch FGR8DQI Platinum IR Infusion Spark Plugs

Product Specifications:

  • Iridium and platinum fused center electrode

  • Features four ground electrodes

  • Pre-set gap installation

  • Longer insulator nose

I know Bosch might be a dubious brand to consider when it comes to spark plugs. While many do rave about it, there are several who do not want to use Bosch at all. But honestly, I suggest you try this out once. The electrode here is a combination of platinum and iridium which is what makes the difference.

In-depth Review

  • The thing I found unique about this was the center electrode. It is a fusion of platinum and iridium. This is built to generate a temperature enough for self-cleaning, soon after it is started. That is useful for proving a resistance against corrosion. These spark plugs are known primarily for their durability. This fusion makes for a good conductor, and as a result, you get a faster spark. It provides an overall enhanced functioning as well.

  • While over time, you would notice the voltage requirement of your car increasing, the fusion here helps to negate that factor as well. Your car does not require as much voltage as those with other spark plugs. And of course, the long-nosed insulator provides resistance against fouling as well.

  • It further features Bosch’s technology of having four ground electrodes. That reduces your car’s voltage requirement for achieving the maximum speed. It moreover provides good combustion as well. You have an easier time during the start up. The yttrium ground electrodes are further built to resist wear and protect against oxidation. This just makes it last for a long time.

  • The surface air gap technology here provides an even more powerful and a longer spark. This would significantly protect your engine by putting lesser pressure on it. It gives you a faster kick up and less fuel loss as well as longevity.

  • The reduced gap space does provide a more powerful and stable spark. However, on the downside, I did not like the pre-set gap setting. While it would fit into most cars, you may have a problem regarding it. It may not work as well for you.


  • Faster start up
  • Low fuel consumption
  • Longer lifespan
  • More horsepower
  • Resistant to oxidation and fouling
  • Protects the engine


  • Pre-set factory gap setting might not suit your car
  • Conductivity could be better

Final Words:

On the whole, even I was a bit skeptical because I had heard a lot of negatives regarding Bosch automotive parts. In fact, I was vehemently opposed when I decided to get this one as well. But it did, and I am glad. I did notice a significant increase in horsepower. And I like the protection it provides to my engine. The gap setting did not bother me because it suited my model. You can check beforehand if it works with yours. For conductivity, I would always go back to copper cored ones. But this was an experiment for me, and it wasn’t that bad either. Check how much you can save, buying the Bosch (4501) FGR8DQI on Amazon

Choosing The Best Spark Plugs For Your Vehicle

  • Spark plugs are like a flashlight which flashes the current on ignition which further lets the fuel burn in the ignition chamber helping the engine work. There are several varieties of spark plugs to choose from in the market. The primary difference lies in the material of the core. You can get copper cored ones, platinum ones, and iridium ones.

  • While copper is relatively less expensive, they are the simplest kind of core available. They are the most efficient conductors, and the make the best spark plugs as well. They have a better ignition capability as well. They do have a shorter lifespan, though.

  • Iridium plugs, on the other hand, have a lower conductivity. But these are made to last longer. They are not as efficient and work at a lower temperature.

  • Platinum plugs have the highest life spans. They work at even lower temperatures. But these can overheat easily. They are not as good either. A double platinum plug is the elevated form of the former. The difference is in the long life span that it provides as compared to the platinum ones. Moreover, they have higher efficiency as well. However, they still fail when it comes to conductivity in comparison to the copper ones.

  • Apart from the core, you should look into other features as well. The nose of the insulator, the gap between the electrodes and other stuff should be suited to your car in particular. The gapping in most spark plugs is pre-configured nowadays. However, some do still need the procedure, and you should go through your car’s manual for this. This is crucial for the smooth functioning of your car engine. Further, the diameter of the thread and the gasket, (whether it is incorporated or conical) factors into your choice as well.

  • Like all other car components, no such spark plug would fit all cars. So please be careful while making your purchase. It would be disappointing to get something only to find that it doesn’t fit your car, however, good the features may sound.

Benefits of Using Good Spark Plugs

  • A spark plug is one of the most important components of your car. It is fitted to the head of the engine’s cylinder. It is built for the ignition of the fuel. The piston draws in air and fuel while moving down the cylinder. It moves up to the spark plug and puts pressure on the mixture.

  • When the piston has reached the highest reach, the spark plug ignites the fuel. This creates the voltage necessary for developing combustion. That is what makes the engine run. As you can see, it is a detrimental component because, without it, the car just won’t work.

  • Spark plugs further dissipate the heat away from the combustion chamber. A car with four cylinders uses four plugs while one with six uses six. It is further beneficial to replace your spark plug periodically.

  • Engines often misfire as a result of weak spark plugs. An efficient spark plug will result in a smoothly operating combustion procedure. But do check your car battery before opting for a new spark plug, as the poor condition of your car battery might also be the reason, you face problem in the ignition.

  • It will further lead to a reduction in fuel usage. You will save money and even natural resources at that. You won’t truly believe the difference it makes till you ignite the engine after replacing your spark plug. Honestly, it’s the smoothest startup you can imagine. It has another advantage as well. You can drastically reduce the air emissions of your car by changing your spark plug.

A Final Verdict:

I hope I could help you to get some more information as you research for your new high performance spark plugs. I significantly narrowed down the list to my favorites. Spark plugs, however, as I mentioned, are unique to car models. It gets better if you know what your car needs as well.

Nevertheless, apart from spark plugs, other factors may affect your engine as well. The carbon build-up can significantly reduce its utility. So keep your engine clean and then you can truly find out why a spark plug is that revered.

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