10 Best Spark Plugs

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Spark plugs might be small, but they play a crucial role in starting your car and running smoothly.

Unfortunately, choosing the best spark plug is difficult and time-consuming.

There are plenty available on the market, and they are often hard to distinguish.

Don’t worry; in this post, I will go over the best spark plugs available today so you can find the right one for your car with ease.

Let’s get started.

1. NGK 6619 Iridium Spark Plugs - Best Iridium Spark Plugs


✅Optimized for heavy-duty use

✅High melting point

✅Helps with pre-ignition

✅Seals combustion content into the cylinder

✅Broadly compatible

✅High performance

✅Fine electrode wire for superior fuel efficiency

✅Durable and dependable

✅Long lifespan

✅The optimal air-fuel mixture provides a boost in power and torque.

✅Metal plating resists corrosion and seizing.

✅A long insulator nose prevents fouling.


🚫Difficult to install

🚫High price per piece


  • Weight:  0.8 ounces 
  • Dimensions:  6.42 x 4.37 x 0.91 inches
  • Installation time: 2 hrs


  • Iridium core material
  • High melting point
  • Durable fine wire center electrode
  • Secondary ignition
  • Iridium IX Spark Plug, mm Thread 
    (1.04″) Reach, /8″ (1mm) Hex Size
  • Gasket Seat
  • Resistor
  • Solid Terminal
  • Projected Tip 
  • Tapered Cut Ground Electrode
  • .044″ (1.1mm) Gap
  • Heat Range 7

What I Like

Perfect for high-tech, high-performance engines

The spark plug’s iridium fine wire center is six times harder than platinum. It assures excellent fuel efficiency, generates a silky-smooth engine idle and response. Gives the starter an intense boost of power and torque.


Long lifespan

It’s Iridium construction, and metal plating design resists moisture, rusting, and corrosion. This provides the spark plug a long-lasting and outstanding performance. It helps avoid engine seizing and stalling.


Excellent performance

Its ribbed surface gives the spark plug a superior grip, while its sealant gives an extra shield against fuel flooding and pre-combustion problems. These will provide you with smoother, stress-free ignition.

What I Dislike

Difficult to mount

When you get this spark plug, you might encounter some problems installing it. It’s better to ask for a mechanic’s assistance to relieve you of this problem. It’s also quite an expensive spark plug.

Who Should Buy?

If you experience ignition problems quite often, switching to a premium quality spark plug is a great option. This spark plug will give you more power, save fuel, and won’t wear out quickly. 

NGK is ideal for mechanics and hobbyists who need an extra supply of spark plugs.

2. NGK 5464 BKR5EIX-11 Iridium IX - Best Forced Induction Spark Plug


✅High performance

✅The heat range of seven

✅Extreme ignitability

✅Improved throttle response

✅Superior antifouling


✅Iridium alloy has a high melting point.

✅Trivalent metal plating provides resistance to corrosion and seizing.

✅A long insulator nose prevents fouling.

✅Improves mileage

✅Manages ignition in freezing temperatures together with a high-powered engine during the summer

✅Designed to handle high-performance vehicles and their powerful engines


🚫Few fitment issues

🚫Incorrect gaping

🚫Delay in acceleration

🚫Quite expensive


  • Weight:  1.6 ounces
  • Dimensions:  3.4 x 0.8 x 0.7 inches
  • Installation time: Two hours


  • Extreme ignitability
  • Improved throttle response 
  • Superior antifouling
  • 0.6 mm laser welded Iridium tip
  • Tapered ground electrode
  • Long insulator nose
  • Highly durable
  • Stable spark
  • Triple gasket seal eliminates combustion gas leakage
  • Corrugated ribs on insulator prevent flashover
  • Iridium alloy with a high melting point
  • Trivalent metal plating
  • Copper core 

What I Like

An all-weather spark plug

It can withstand changing temperature. It offers full-throttle response and  efficient mileage  during harsh conditions. Even during freezing temperatures and scorching summers its performs at a high level. 


Strong resistance to intense heat

It has exceptional resistance to heat and electrical wear suitable for today’s high performing engines.


Rust and corrosion-proof

Its metal plating provides excellent anti-corrosion properties. And its anti-seizing qualities make it durable and long-lasting.

What I Dislike

Fittings and acceleration problems

Before you purchase these spark plugs, you should be ready with a few issues. For one, you might encounter fitting issues because it can have inaccurate gaping. You may also experience an acceleration delay.



The spark plugs come in four in a pack. Another box is needed for you to get a complete set for your vehicle. So you need to dig deeper into your pockets.

Who Should Buy?

This spark plug is specifically ideal for performance connoisseurs. It delivers high performance when it comes to extreme ignitability, improved throttle response, and improved mileage.

3. Champion RER8ZWYCB4 (9407) Iridium - Runner Up


✅Compatible with passenger cars, light trucks, and power sports applications

✅Supports use to all engines and ignition systems.

✅Focused spark for maximum power

✅Heat-active alloy allows electrodes to reach optimal temperature fast and maintain a stable operating temperature.

✅Faster throttle response

✅0.77 mm fine-wire iridium center for maximum life

✅V-trimmed platinum ground electrodes for sharper spark focus



🚫Installation requires a little patience.

🚫Over-tightening during installation may cause problems.


  • Weight:  0.8 ounces 
  • Dimensions:  4 x 3.9 x 1 inches
  • Part Warranty: n/a
  • Installation time: n/a


  • Vehicle specific
  • Focused spark
  • Heat-active alloy
  • Faster throttle response
  • Fine wire iridium center
  • V-trimmed platinum ground electrodes
  • Taper cut

What I Like

It gives the sharpest spark focus

The spark plug’s fine-wire has an iridium center and platinum ground electrodes. It also holds a heat-active alloy that smoothly runs electrodes to reach its prime, maintaining a stable temperature under all load conditions.



The fine-wire Iridium center electrode and platinum ground make this spark plug deliver maximum life.

What I Dislike

Installation process

One drawback you might encounter when you mount this spark plug in your vehicle is over-screwing it. You should avoid this because it can strip the threading that leads to ignition problems.

Who Should Buy?

If you’re looking for a heavy-duty and high-performing spark plug, this is a suitable choice. It’s compatible with all engine types and ignition systems. It is also reasonably priced and allows you to purchase single spark plugs. 

4. NGK (6994) Laser Iridium Spark Plug


✅Operates at wider heat range (6)

✅Resists carbon buildup and pre-ignition

✅High alumina ceramics for superior heat transfer and electrical insulation

✅Solid copper core and nickel tipped electrode for longer life.

✅Patented triple gasket seals to prevent gas combustion leakage


✅Trivalent metal plating for anti-corrosion and anti-seizing

✅Longer service life

✅Six times harder than platinum

✅High melting point




  • Weight:  1.58 ounces
  • Dimensions:  4.35×2.24×2.08 inches
  • Part Warranty:  n/a
  • Installation time: One hour


  • Operates on wider heat range
  • Carbon buildup resistant
  • Pre-ignition resistant
  • Alumina ceramics
  • Copper core 
  • Nickel tipped electrodes
  • Triple gasket seals
  • Laser welded Iridium center electrode tip
  • Platinum disc welded to the backside of the ground electrode.
  • Longer insulator nose
  • Trivalent metal plating

What I Like

It has a high melting point

This spark plug can run over a much extensive heat range. It’s alumina ceramic insulator has superior strength that provides better heat transfer and electrical insulation. It’s copper core also helps heat removal. 


Toughness you can trust 

What makes this spark plug strong and hard-wearing is its platinum disc welded to the ground electrode’s backside. Along with a solid copper core and nickel electrode, these ensure high durability, greater spark, and stable idle.


Total performance

It performs at its best–its sealing process prevents combustion leakage. Its longer insulator nose fends off fouling and misfiring, giving quicker starts and acceleration for better fuel economy and lower gas emissions.

What I Dislike

It’s expensive

It may not be a disappointment, but what might hinder you from getting this spark plug is its price. Since it’s Iridium, this spark plug is costly.

Who Should Buy?

This spark plug is ideal for car or truck owners with 2011 to 2017 GT and 2012-2013 BOSS Mustangs equipped with the four-valve 5.0L coyote engine. This spark plug is a direct fit replacement.

5. ACDelco 41-103 Professional Iridium Spark Plug


✅Iridium provides a high melting point and excellent strength.



✅Lasts up to 100,000 miles

✅Provides engine idle stability

✅Smooth performance

✅Cold start and quick acceleration

✅Burns carbon deposits

✅Suppressor seals block radio frequencies and prevents combustion leakage.

✅Perfect gaps

✅Increases fuel efficiency


🚫Its design doesn’t work on all makes and models.

🚫Iridium is on the expensive side.


  • Weight:  1.44 ounces
  • Dimensions :  6.7 x 3.9 x 1 inches
  • Part Warranty: n/a
  • Installation time : n/a


  • Iridium fine wire electrode 
  • One-piece suppressor seal
  • Suppressor seal meters
  • Copper core
  • Multi-rib insulators

What I Like

Quickly ignites in all weather conditions

The spark plug’s design is dependable for cold starting and fast acceleration. It also provides a high melting point. Its Iridium fine wire electrode burns away carbon deposits that minimize spark erosion.


Prevents combustion leakage

It has a suppressor seal. It’s a useful cover that blocks radio frequencies that affect your vehicle’s electronic components, preventing it from leaks.


It can run up to 100,000 miles

It provides superior engine idle stability giving you a smooth performance. Its spark gap will stay the same during its lifespan, increasing your vehicle’s fuel efficiency.

What I Dislike

Substandard packaging

It’s disappointing to know that no matter how excellent this spark plug performs, it lacks quality packaging. It’s packing tends to fall out while shipping causing the spark plug to break.

Who Should Buy?

This spark plug can execute well on high-performance and older vehicles that require conventional plugs. This Iridium-made spark plug can give outstanding performance when it comes to quick ignition, weather conditions, and durability.

6. NGK BKR7EIX Iridium IX Spark Plug


✅Higher range up to 50,000 miles

✅Engine mechanism will work properly

✅Easier with installation

✅This spark perfectly fits in various engines

✅An easy installation process

✅Amplifying acceleration & mileage

✅The smooth running of the engine

✅Suitable for supercharged and turbocharged engines

✅Fine wire center electrode gives a constant spark and ensures high durability


🚫It will be costly

🚫Machines might face a misfire

🚫Power might have a limited capacity

🚫Has no pre-gapping


  • Weight: 1.76 ounces
  • Dimensions: 3.43 x 0.98 x 0.89 inches
  • Installation time: 1-hour installation
  • Part Warranty: 1 Year Warranty


  • Excellent electrodes
  • Will last up to 25%
  • Eight times stronger

What I Like

Strong and durable

Among spark plugs, iridium is the most durable. The NGK BKR7EIX Iridium IX Spark Plug can outlast other products because of its strong alloys.


Engine high performance 

The NGK BKR7EIX Iridium IX Spark Plug gets developed to give full throttle to your car, increasing the engine’s performance.


No fouling

This highly durable spark plug also ensures there is no fouling. It also comes laced with a triple gasket seal that prevents the possibility of gas leakage.


Vehicle protection

This spark plug is least susceptible to corrosion and seizing owing to its trivalent metal plating. 


Decreases electrical quenching effect

The plug comes with a unique design with a finely welded tip that takes care of continuous and stable ignition, reducing the electrical quenching effect.

What I Dislike


One of the downsides of this plug is that it’s quite expensive. But this is because it boasts of high quality and offers numerous benefits.



Another disadvantage of this plug is that you require re-gapping it so that you can install it appropriately.

Who Should Buy?

 If you’re looking for higher performance in your car with an increased throttle capacity and a smooth working of the ignition, then the Iridium spark plug is the one you should buy. 

7. Bosch 4417 Platinum+4 FGR7DQP - Best Platinum Spark Plug


✅It will stop the engine from fouling

✅The engine performance enhanced

✅Easier with installation

✅Lower fuel consumption

✅Service friendly plugs

✅Gives air gap lighting technology

✅No Requirements of Adjustments

✅Installation is way too easy.

✅The acceleration process is smooth

✅Improves the throttle of the engine


🚫Will not suitable for all cars

🚫Will be costly

🚫Will only have a single plug.


  • Weight: 0.353ounces        
  •  Dimensions: 3.43 x 0.98 x 0.89 inches 
  • Installation time: One-hour installation       
  • Part Warranty: Limited Lifetime Warranty       


  • Triple seals
  • Copper made
  • Silicated Insulator

What I Like

Combustion efficiency

One of the main advantages of Bosch Platinum+4 Spark Plug is that it offers combustion efficiency, thereby enhancing your vehicle’s performance. That is because it comes with four yttrium enhanced ground electrodes.


Quick start

It facilitates easy to start and smooth acceleration as the plug reaches self-cleaning temperatures quite quickly.


Longer lifespan

You can be sure of a longer lifespan when you opt for this high-quality spark plug. That attributes to its top-notch electrode components.

What I Dislike


It’s quite pricey compared to others with the same features, But the Bosch 4417 Platinum+4 FGR7DQP does offer good value for money.


Not enough

Compared to the Iridium plugs, Bosch Platinum+4 Spark Plugs offer less power. This may impact vehicle performance.

Who Should Buy?

For beginners, the easiest way out to install these plugs into the car. Those who have the budget can also access the higher performance they get by using this spark plug.

8. Motorcraft SP-515 Spark Plug


✅Will fit every possible car, even the heavy ones

✅Easily installed and can be removed anytime

✅It has a wide range of compatibility

✅Perfectly durable and a top-notch performance

✅Will last up to 40,000 miles


🚫Misfires can happen in low levels

🚫For beginners, the installation will not be easy

🚫Not every Ford model is suitable.


  • Weight: 3 pounds
  • Dimensions: 6 x 3 x 3 inches
  • Installation time: 2 hours installation
  • Part Warranty: Two-year warranty


  • Tested to Ford specifications
  •  Include continuous Improvements
  •  Resistant to oxidation and arc erosion
  • Multi-rib insulator 
  •  Nickel-plated shell 
  •  Extended service intervals

What I Like

Boosts Vehicle Performance

As this spark plug improves the gas mileage, you will notice a drastic change in your vehicle’s performance. 


Easy to install

Although Motorcraft-SP-515-Spark-Plug offers several advantages, it does not require an elaborate setting. It’s easy to install.


No Gas Leakage Problem

With this top-notch spark plug, you will not face a gas leakage problem that likely leads to critical issues such as misfires. That is because of its reliable seal.

What I Dislike

Needs specific tools

It can be challenging to change these without appropriate tools. You must have a spark plug extractor handy to remove this high utility plug.

Who Should Buy?

 Those who want to get rid of their old, exhausted spark plugs and look for better ones with better capacity truly consider this one.

9. NGK (3403) TR55GP G-Power Spark Plug - Budget Spark Plug


✅Corrosion will not happen

✅Will improve throttle response and will stop fouling

✅Will deliver an optimized and more extended performance

✅Will prevent gas leakage

✅Less fuel consumption

✅And will run efficiently and quickly.


🚫Not applicable to all cars

🚫Will cost more in comparison to other spark plugs

🚫Will need re-gapping


  • Weight: 1.6 ounces
  • Dimensions: 4 x 1 x 1 inches
  • Installation time: 1-hour installation
  • Part Warranty: 1 Year Warranty·


  • Tested Fine wire platinum tipped center electrode 
  • Trapezoid cut ground electrode 
  • Trivalent metal plating 
  •  Corrugated ribs 
  •  Pure alumina silicate ceramic insulator
  • Copper core 
  • Triple seals 

What I Like


The G-Power Platinum Alloy Spark plug lowers vehicle emissions. It thus helps in reducing the carbon footprint.


No more gas leakage

The high-quality plug has a triple seal. That prevents the chance of gas leakage, so it reduces the risk of misfires that can be extremely hazardous.

What I Dislike

Elaborate installation process

The spark plug is not so easy to install. It takes an elaborate system to finally fit it into what could have been a simple spark plug replacement. 



It has a higher price compared to other spark plugs. However, every penny spent on it is indeed worth it.

Who Should Buy?

For professional race drivers, this spark plug is designed for you as it allows superior performance, which is necessary for your field. Or anyone who is looking for optimized performance for your car, this is what you might need. 

10. Denso (4503) PK16TT Platinum TT Spark Plug


✅Allows almost 100,000 miles of mileage

✅In compare to other plugs, this one has a longer lifespan

✅With the help of titanium and platinum, it doesn’t allow corrosion to occur

✅Does have increased fuel efficiency and economy

✅Gives Maximum performance


🚫 Like others, this one is also expensive.

🚫Doesn’t allow gap growth


  • Weight: 0.704 ounces
  • Dimensions: N/a
  • Installation time: 1-hour installation
  • Part Warranty: 1 Year Warranty


  •  1mm platinum-tipped center electrode
  •  Titanium-enhanced 1.1mm ground electrode
  • Machine rolled threads 
  • 100% pre-fired ·        
  • Purified alumina powder insulator 
  • Five rib insulator
  •  Copper-glass with insulator 

What I Like

Great Mileage

One of the best things about the Denso (4503) PK16TT Platinum TT Spark Plug is that it offers great mileage.


Boosts engine

The Platinum TT twin tip design of this high-quality plug boasts engine efficiency. This unique design also gives way to quicker flame propagation.

What I Dislike

Need for Spark Plug Gapping

To enhance your vehicle’s performance, you require spark plug gapping. You cannot expect a drastic change by merely installing this spark plug.

Who Should Buy?

 This spark plug is for those experiencing bad spark plugs corrosions or slow acceleration, or engine misfires.


Spark plugs are vital to start your engines.

Just be aware that for its small size, it can be deceptive. When spark plugs start to fail, it can reduce your vehicle’s fuel efficiency.

So choosing one is very crucial. You need to understand how spark plugs work, how to work with them, and how to pinpoint indications of a spark plug that will best fit for your vehicle’s needs.

Moreover, you have to know essential details when choosing a spark plug. Find what’s durable, resistant to corrosion and leaks, performs well in all types of weather conditions, and the one that can ignite fast and sustain its power.

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