10 Best Spark Plugs – Reviews & Buying Guide

Best Spark Plug

A spark plug is directly responsible for the internal combustion engine to operate. This means that if there is a faulty spark plug then the car will never start.

The responsibility of a best spark plug doesn’t just conclude on starting the engine but it is equally responsible for keeping the smooth operations in check.

The life of a spark plug mainly depends on its material. Most of these products last for over 7000 miles or more. But, at some point, you have to consider the change of product.

In this spark plug review, we will share some of strong recommendations in the niche. Hope these will benefit you in making the next great purchase.

You can also read other product reviews such as spark plug wire set, ignition coil, exhaust system.

10 Best Spark Plugs - Reviews

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Product Name

Rating

Current Price

NGK 7090 BKR5EGP G-Power Spark Plug

1. NGK 7090 BKR5EGP G-Power Spark Plug

4.4

ACDelco Professional Iridium Spark Plug

2. ACDelco Professional Iridium Spark Plug

4.7

Denso (4504) PK20TT Platinum Spark Plug

3. Denso (4504) PK20TT Platinum Spark Plug

4.4

NGK 5464 BKR5EIX-11 Iridium Spark Plug

4. NGK 5464 BKR5EIX-11 Iridium Spark Plug

4.4

NGK 6240 PLFR5A-11 Laser Spark Plug

5. NGK 6240 PLFR5A-11 Laser Spark Plug

4.3

Bosch 6702 Platinum Spark Plug

6. Bosch 6702 Platinum Spark Plug

4.4

Champion RER8ZWYCB4 Iridium Replacement Spark Plug

7. Champion RER8ZWYCB4 Iridium Replacement Spark Plug

4.4

NGK 3403 G-Power Platinum Alloy Spark Plug

8. NGK 3403 G-Power Platinum Alloy Spark Plug

4.5

Motorcraft SP-515 Spark Plug

9. Motorcraft SP-515 Spark Plug

4.3

Autolite APP104 Double Platinum Spark Plug

10. Autolite APP104 Double Platinum Spark Plug

4.6

1. NGK 7090 BKR5EGP G-Power Spark Plug    

Editor's Rating: (4.4 / 5)

NGK 7090 BKR5EGP G-Power Spark Plug

NGK brings you this amazing platinum alloy spark plug that is manufactured to deliver superior performance. Also, it promises better fuel efficiency, quicker starts and lower emissions.

When it comes to the durability factor, it is equipped with 0.6 mm laser welded fine platinum tip which helps in voltage reduction thus making it serve you for long. It is the best spark plug owing to the performance and consistent stable spark.

Moreover, it has improved throttle response due to the special configurations which have been used for the insulator noses. This is the best NGK spark plug to prevent fouling with corrugated ribs on insulator.

To ensure great spark, it features platinum alloy ground and centre electrode. Also, its metal plating is an awesome addition to lend anti-corrosion and anti-seizing properties.

If you are worried about gas leakage, this product has a triple gasket seal to eliminate this problem while offering good life. It is definitely a considerable option at an economical cost and the best overall spark plug in our list.

Pros:

  • Competent and cheaper
  • Eliminates gas leakage
  • Improves fuel efficiency
  • Anti-corrosion and anti-seizing properties

Cons:

  • Isn’t suitable for beginners

2. ACDelco Professional Iridium Spark Plug   

Editor's Rating: (4.7 / 5)

ACDelco Professional Iridium Spark Plug

This is the best Iridium spark plug from the house of ACDelco, offering smooth performance and great engine idle stability. These plugs come in a pack of 8 and are the premium replacement plugs to suit your requirements like fit, function and form.

As Iridium offers more efficient electrode designs, this spark plus ensures improved cold starting and quick acceleration better than any other plug. 

Also, these plugs are made with latest technology which is why they are exact replacement for original components. As you may know, Iridium has strength of all metal and also has the highest melting point.

This spark plug burns away carbon deposits as they form and helps improving fuel ignition due to the Iridium fine wire electrode. It offers improved fuel economy, good wear resistance, and durability over platinum spark plugs.

Although it is a little expensive, it provides the best durability and wear resistance. Plus, the suppressor seal blocks radio frequency which affects electronics of your vehicle.

Moreover, its seal meters ensure longer electrode life providing seals against combustion. Since it is engineered exceptionally, you can expect enhanced performance.

Pros:

  • Better cold start and quick acceleration
  • Durable
  • Improved fuel ignition
  • Best performance

Cons:

  • A little expensive

3. Denso (4504) PK20TT Platinum Spark Plug   

Editor's Rating: (4.4 / 5)

Denso (4504) PK20TT Platinum Spark Plug

Meet this best platinum spark plug manufactured with twin tip technology for complete combustion. This is a good spark plug when it comes to improved fuel economy and great acceleration.

Its purified alumina powder insulator ensures commendable dielectric strength as well as thermal conductivity. Other than that, it is equipped with 11 mm platinum centre electrode and 11 mm titanium enhanced ground electrode to deliver exceptional performance.

The platinum alloy on the centre electrode improves the service life of the spark plug whereas the titanium alloy contributes in maximising the durability of the plug. Certainly, it is the best platinum spark plug in our list.

Moreover, this spark plug starts faster than any other single platinum plug. With its alumina powder insulator, the plug can withstand extreme stress with much ease.

Talking about the durability and prolonged use, this spark plug is a complete package at quite an affordable cost. It delivers great corrosion and erosion resistance, making this spark plug a consistent product of all times.

Plus, the technology with which it has been manufactured makes sure to reduce emissions as well as the titanium infused electrode minimizes erosion to retain a larger spark even after thousands of miles.

Pros:

  • Provides fast starts and better acceleration
  • Withstands extreme stress
  • Cheapest spark plug
  • Erosion and corrosion resistant

Cons:

  • Not compatible with some car engines

4. NGK 5464 BKR5EIX-11 Iridium Spark Plug    

Editor's Rating: (4.4 / 5)

NGK 5464 BKR5EIX-11 Iridium Spark Plug

NGK has manufactured this best performance spark plug to offer amazing ignitability, superior anti-fouling and enhanced throttle response.

To deliver great performance, this spark plug features 0.6 mm laser welded fine Iridium tip. The tip makes sure to offer high durability and stable spark making your vehicle perform at its best.

With its longer insulator nose, it prevents fouling and the tapered ground electrode reduces quenching effect.

Are you worried about the combustion gas leakage while driving the vehicle? Not to fret, the triple gasket seal eliminates gas leakage and the corrugated ribs prevent flashover.

When it comes to electrical and heat wear, this spark plug has extremely high melting point which makes this plug one of its kinds. As it is listed among the high-performance engines, you can buy it without any second thoughts.

Also, it has anti-seizing and anti-corrosion properties to keep the plug working for longer duration. Yes, you have to spend good amount of money but the product delivers exceptional performance. It is surely the best performance spark plug.

Pros:

  • High durability
  • Anti-corrosion and anti-seizing properties
  • Extreme ignitability
  • Eliminates combustion gas leakage

Cons:

  • Pricey

5. NGK 6240 PLFR5A-11 Laser Spark Plug   

Editor's Rating: (4.3 / 5)

NGK 6240 PLFR5A-11 Laser Spark Plug

NGK is the best spark plug for gas mileage and because this is the third product from the same brand, you can expect a great level of performance.

It is a renowned brand that always ensures to provide amazing fuel ignition and improved throttle response. When it comes to better heat transfer and great strength, its pure alumina silicate ceramic insulator takes proper care.

If you are looking for a performance oriented yet an affordable spark plug, this product is nonetheless a great choice. To offer faster starts and quick acceleration, the laser welded electrode tip works wonders.

It has copper core to help in heat removal and triple seals have been embedded in the plug to prevent combustion gas leakage.

NGK spark plugs are all time favourites of the customers because they put special emphasis on maintaining the acceleration power and smooth starts. Plus, the plugs are of premium quality and are built to OEM specifications.

With its trivalent metal plating, it makes sure to deliver protection against seizing and corrosion while keeping the durability factor up to the mark. The height of the spark plug is 50.5 mm starting from the seat to the top of the terminal.

Looking for a reliable and quality product? Get your hands on this best spark plug for gas mileage as it promises long lasting durability and reduced emissions.

Pros:

  • Copper core for heat removal
  • Metal plating
  • Anti-corrosion and anti-seizing properties
  • Durable

Cons:

  • Needs gapping

6. Bosch 6702 Platinum Spark Plug   

Editor's Rating: (4.4 / 5)

Bosch 6702 Platinum Spark Plug

Bosch is a brand which has always been manufacturing innovative and performance-proven products. It brings you this economical spark plug that is trusted by equipment manufacturers across the globe.

This spark plug is enabled with platinum firing pin and yttrium ground electrode which are well-known to offer double longer service life. When it comes to performance, it works great as compared to standard copper plugs.

Talking about the OE fine wire platinum design, it guarantees optimum ignitability, fit and function. You will get good results owing to its nickel-plated shell that requires no anti-seize.

This spark plug comes with 4-year performance satisfaction guarantee. Also, the 360 degrees continuous laser welding offers enhanced durability by fusing the platinum firing pin.

Moreover, Bosch promises quick installation in its entire product range. How? It is because the spark plugs have pre-gapped and nickel-plated threads which allow easy setup without adjusting the gap for different vehicles.

Invest in this product which can also be recognized as the one of the finest spark plugs from the world’s most advanced engines and enjoy using its latest technology to the fullest.

Pros:

  • Pre-gapped
  • Enhanced durability
  • Fine wire platinum design
  • 4-year performance satisfaction guarantee

Cons:

  • May have to consult professionals for installation

7. Champion RER8ZWYCB4 Iridium Replacement Spark Plug   

Editor's Rating: (4.4 / 5)

Champion RER8ZWYCB4 Iridium Replacement Spark Plug

Meet this best replacement spark plug which is manufactured by a renowned brand i.e. Champion. This brand makes sure to launch products which suit the requirements of the customers and is a little different from other spark plugs in this review list.

It delivers great performance owing to the fine-wire Iridium centre electrode. The platinum ground helps in maximizing the overall life of the plug thus making it a durable choice for all.

Get faster throttle response, focused spark and maximum power if you grab this replacement spark plug.

With its exclusive heat-active alloy, the spark plug allows the electrodes to perform well while reaching to optimal temperature and then remain stable there, no matter what the engine load is.

Moreover, this spark plug is suitable to powersport applications, passenger car and light truck etc. The vehicles include Volkswagen, Jeep, Honda, Audi, Dodge, Porsche, Mitsubishi and many more.

Also, it delivers great engine performance and works with almost all engine types. Isn’t great? This feature makes it distinct from other spark plugs as they are not compatible with all engines.

Pros:

  • Compatible with all engine types
  • Great engine performance
  • Features exclusive heat active alloy
  • Durable choice

Cons:

  • Requires professional help for installation

8. NGK 3403 G-Power Platinum Alloy Spark Plug   

Editor's Rating: (4.5 / 5)

NGK 3403 G-Power Platinum Alloy Spark Plug

NGK has always been the first choice of customers when it comes to spark plugs. The fine wire platinum tipped centre electrode reduces voltage to offer fast and better starts. Also, it enhances fuel economy and delivers longer durability.

Furthermore, it features triple seals to prevent any type of gas leakage and save the vehicle from misfires. The advanced materials used during its manufacturing make sure to increase operating performance and engine power.

As this spark plug is well suited to professional race teams, automotive enthusiasts, street racers and any type of consumers, it has been accepted across the globe widely.

As compared to conventional plugs, it has more properties like copper core for heat removal, alumina silicate ceramic insulator for better heat transfer, metal plating to resist corrosion and seizing and trapezoid electrode to reduce quenching.

While all these features are must to be in a spark plug, this one can be considered if you don’t mind spending a little over the board on a spark plug.

Pros:

  • Greater fuel economy
  • Anti-corrosion and anti-seizing propertiesent
  • Incredible strength
  • Prevents gas leakage

Cons:

  • Expensive

9. Motorcraft SP-515 Spark Plug

Editor's Rating: (4.3 / 5)

Motorcraft SP-515 Spark Plug

The next model in our list is a very basic yet performance savvy product from Motorcraft. This is a platinum made spark plug, available to you at an economical price.

The performance of this product is quite astounding. Also, it makes the engine run smoothly. We make it is a considerable option because of the low price while the efficiency is amazing.

The fine wire centre electrode helps in diminishing the voltage and thus starting the engine becomes easier than ever.

The seal is also quite firm to prevent and kind of gas leakage and provide protection against misfires. This is a great choice to make, especially if you are on a budget.

The engine performance is satisfactory and it provide smooth acceleration for your convenience. We personally recommend this model to all our readers.

Pros:

  • Economical
  • Performance Savvy
  • 2 years warranty
  • Durable

Cons:

  • The installation can be a hassle for the beginners

10. Autolite APP104 Double Platinum Spark Plug   

Editor's Rating: (4.6 / 5)

Autolite APP104 Double Platinum Spark Plug

Last in my list is this double platinum spark plug from the house of Autolite. This one has good engine performance for long life as well as improved fuel economy.

This spark plug is equipped with platinum to platinum firing whilst eliminating gap erosion and reducing misfires. Plus, it promises quick starts and smooth acceleration which you will definitely adore.

Also, it is equipped with necked down center electrode which fires quick and clean. With center wire platinum firing tip, it provides durability and superior performing spark plug.

The high nickel alloy side electrode ensures maintaining precise gap and full copper core electrode delivers amazing performance in all types of conditions.

To lend more focussed ignition for overall ignitability, this spark plug is crafted with platinum sidewire technology. Since these spark plugs are made of advanced technology, they are perfect for DIS engines.

Enjoy 7 years guarantee on this product if you buy it and because its guarantee period is the maximum as compared to other spark plugs, this one is a must-try. Also, it’s the best-rated spark plug in our list for all the amazing features and stand-outs.

Pros:

  • 7 years guarantee
  • Quite affordable
  • Optimized engine performance
  • Durable and advanced

Cons:

  • Gap is not accurate

How to Buy the Best Spark Plug

How to Buy Best Spark Plug

By far, you must have understood the inevitable requirement of this component. Next in our spark plug review, we will discuss some crucial information on finding the right item.

Well, this is not something that you purchase every now and then. So, better make your purchases worth each penny spent. Plus, it will be safer for your car if you buy the right product. So, let’s go:

#1. Compatible

Who would want to buy a product that is not compatible with the car engine. Plus, if it requires a good amount of money to be spent then you should be extra careful.

As far as the compatibility is concerned, not all spark plugs are suitable for all kind of engines. That is why, most of the best spark plug brands mention the car models with which their product will be compatible.

This comes down as a huge help from the brands because you don’t have to struggle in finding the right product.

#2. Type of Spark Plugs

Well, this is a huge pool of options that will surely confuse you while making the purchase. But, if you have good idea on the kind of product that your car engine needs then its more like a cake walk for you.

So, we will now discuss the different types in spark plugs and try to elaborate them as much as we can:

Copper/Nickel Spark Plugs: While the name might confuse you because mostly these plugs are referred as copper plugs but only the inner core is made of copper.

Other than that, the whole thing is nickel constructed. Copper has good tendency to conduct electricity. That is why, most of the cores are made with this material.

So, these are less expensive but the drawback is that they have smaller life. The durability becomes even challenging when it is used in high-energy distributor-less ignition system.

But, at some point of time, these were quite efficient. They also run good on the natural gas engines. While the price control is definitely a pro, it is yet not suggested for the modern automobiles.

Single Platinum Spark Plugs: So, the next type has a platinum centre electrode. It is relatively expensive for the obvious reasons. Platinum is a rear element of nature and it is quite pricey.

This material is harder than nickel so you can rest assured that it will not corrode. This will not allow the gat at the tip to widen as the metal starts to wear which directly affects the efficiency of the plug.

There are some models with one or more fine wires inside the platinum disc. This helps in conducting electricity in a superior fashion. But it definitely affects the cost.

As far as lifetime is concerned, it is double the span of a standard spark plug made of nickel/copper. This one is definitely recommended if you are willing to spend for it.

Double Platinum Spark Plugs: As we mentioned about the single platinum plugs contain platinum centre electrode, this is double platinum which means it caters centre and ground electrodes.

No wonder that the cost will be higher but at the same time, the life, performance, and efficiency will be better as well.

Iridium Spark Plugs: Well, if you desire seamless and smooth performance of the engine then nothing is better than Iridium products.

These have longer lifespans than the traditional plugs. The fine wire centres are designed in perfect way to conduct electrical energy in best way.

These are the costlier ones but you cannot overlook the incredible performance.

Silver Spark Plugs: As we go further, we take you to the option that has best thermal conductivity. However, the durability remains a concern because these cannot live up to the level of platinum or Iridium plugs.

Buying Advice: Well, our final word on this topic will be that while all the options are suitable one way or the other, the platinum based gives a check to all the requirements.

These are relatively affordable than Iridium and much better in performance and durability than the copper/nickel ones.

So, the Platinum spark plugs are the ones that we recommend. However, if you can spend a little extra then you should consider Iridium spark plugs as well.

#3. Cold or Hot Spark Plugs

Well, if you want a precise and less-tricky definition then let me tell you that the plugs that becomes very hot are the hot plugs. And the ones that don’t touch the highest temperature bar are the cold plugs.

Interestingly, the metal shell of the plug functions at a similar temperature as the head. The plugs are screwed together which makes a chamber for the heat to flow to all the parts.

The hot plugs have longer insulator tip with large surface area which is usually exposed to the heat, making the entire thing hot. At the same time, the cold spark plugs have short insulator tip which helps in removal of heat from combustion area faster.

The spark plug makers usually assign numeric heat rating. They cannot give uniform rating because some of the makers give higher numbers for hot plus while others do the same thing for cold plugs.

It becomes extremely difficult for the buyers to pick the right plug with such variableness. Best is to specify the car engine model and year to find the right product.

#4. Replacement VS Performance Spark Plugs

Well, there are primarily the spark plugs that are geared for high performance. Irrespective of the metal used in the making of this component, they are designed to withstand mechanical shocks.

Plus, the temperature fluctuations are also one of the major things that a spark plug must bear. At the same time, irrespective of the material used on the tip as well, the coatings will be consumed on constant usage.

There are various other things that can deplete the life of this component such as low octane fuel, incorrect mixtures, etc.

Well, since your spark plug has been going through so much, we recommend to pulling it out and get it examined if this requires a replacement. Perhaps, it will declare the time when the new one should be ordered.

#5. Easy to Install

If you want to try your hand in replacing the spark plug then you better pick an item that is easy to install. This is a crucial concern. So, if you are not 100% sure, don’t try this at home.

When Do You Need to Change Your Spark Plug

When Do You Need to Change Your Spark Plug

Well, the first obvious reason is the aging of the component that requires changing. While these product lasts for a decent amount of time, but at one point you will have to change the component.

If you will take a word from the technicians then they will recommend the change after every 30000 miles for copper/nickel plugs and 50000 miles for iridium plugs.

This is not a stringent figure. If you feel that your car is causing trouble then you can get it changed sooner as well. Other coordinating reasons may include:

  • Backfiring when you step on gas
  • Rough performance of engine on idle
  • Charred wires of the current spark plug in use
  • Increased fuel consumption
  • Slow acceleration of the vehicle or causing jerks back and forth
  • Trouble starting the engine

So, these are some common announcements by spark plug for a change.

How to Change the Spark Plug

First of all, changing spark plug is not as simple as it seems. If you are unsure about the DIY then it is recommended to seek professional help.

The removal of spark plug is pretty straightforward. But same is not the case with the installation. So, we will follow some steps below:

#1. Remove the Extras

You should start with the removal of vanity cover plus the air cleaner assembly from the engine. Make sure to label all the hoses that you disassemble so that it won’t cause any trouble later. Now, simply clean all the parts.

#2. Remove the Ignition Coil

Now, you should disconnect the ignition coil electrical connector and rock it off the coil. Then simply remove the coil while holding down the bolt and pulling it out.

Then you must remove the COP systems. This can be done with the needle-nose pliers. At last take off the spark plug.

#3. Unscrew The plug

Now, simply clean the whole area and slide exact size spark plug socket over the plug. We recommend swivel-head socket because it makes the job pretty easy. Use some extension to reach the plug, rotate it counter clockwise and loosen it.  

#4. Gap it

Make sure to check the spark plug gap. Also, buy a wire-style gap gauge than purchasing disc-style gauge. Such can bend the electrode or even break it.

Now, push the wire gauge within the electrodes. Make sure that the wire dragged slightly between them. Make sure that the gap is filled appropriately.

#5. Install the New Plug

Be sure that the new plugs have anti-corrosive coating. So, use a torque wrench to tighten them firmly. Now, apply a thin coat of grease inside the plug boot before you reinstall the coil.

Conclusion

We conclude the review by saying that a spark plug is direly important for any car engine. It is a crucial purchase and probably demand a decent amount of money to be spent.

So, what you can do is to check the list of recommendations that we have given above to find a suitable product.

As far as hot or cold spark plug is concerned, there is no constant method of finding the right plug for your car. For this, you will have to look for a specific model.

We will now leave the rest for you and hope that our efforts will help you in the process of finding the best spark plug for your car.

Happy Shopping!

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