Best Spark Plugs for Horsepower – Performance – Fuel Mileage (2018 edition)

hedgehog with spark plug hair

Hi there! My name is Matt and I’m here today with a guide to help you find the best spark plugs for your car or truck. Whether you want to increase horsepower, performance, or gas mileage, there’s a spark plug for you. Read on to learn which one you should buy.

How do you choose the best spark plugs for your vehicle?

So you’ve got your wireless OBD2 adapter and you’re checking engine MIL isn’t on. You don’t have to worry about Johnny Law because you’ve picked up a nifty radar detector…. But your hotrod just isn’t running as well as it used to. You’ve noticed some slight stalling and that GM LS1 engine just isn’t purring like it should. If you’ve experienced this…

It might be time for you to replace your spark plugs!

The spark plugs in your car are essential if you want to reach your next destination. Your car may run a while without oil or water; however, your spark plugs activate your engine, so you need them in working condition at all times. But what spark plug should you be using? We highly recommend you read your car user manual because there are four major types of spark plugs.

Four of the Best Spark Plugs Available in 2018

Spark Plug NameTip MaterialTop FeaturesPrice

1. Denso 4504 PK20TT

Denso 4504 PK20TT
PlatinumLow cost OEM-quality replacement$

2. NGK 3403 G-Power

NGK 3403 G-Power

PlatinumGreat plug for reducing emissions and improving fuel mileage$

3. ACDelco 41-962 Professional

ACDelco 41-962 Professional
PlatinumHigh quality professional platinum spark plugs$$

4. NGK Iridium IX Spark Plug

NGK Iridium IX Spark Plug
IridiumBest of the best! These Iridium produces the most power and performance$$

5. ACDelco Wire Set

ACDelco Wire Set
Wire KitMost universal spark plug wire kit for a good price$$

best spark plugs



What kind of spark plugs do I need?

Before forking over your hard-earned cash for a new set, you need to figure out which spark plug type you need. There are 4 different types of spark plugs and they are listed below with a brief explanation.

Four Different types of spark plugs:

  • Iridium – Often considered to be the “best plugs for high performance.” Iridium usually lasts 25% longer than platinum, but you guessed it, they’re usually more expensive! The electrode is .4mm and the smallest of all four.
  • Platinum – An upgrade from Copper plugs that can last up to 100,000 miles of usage. You’ll need Platinum plugs for most newer vehicles that utilize distributer-based systems
  • Double platinum – Are these twice as good as single platinum? Not exactly. The design is called a “waste spark” and sends a spark on compression but then wastes the spark on the return. Basically they offer slightly higher performance, but not worth the extra money unless your owner’s manual calls for them.
  • Copper Core– These are designed for old (think 80s…) style vehicles that run carburetors. These plugs have the largest diameter electrode of 2.5mm.

Austin explains these different spark plug types well in this video


Why would I need spark plugs?

These plugs produce a small spark of electricity that leaps across a short distance towards a combustion chamber. Inside the chamber there’s some fuel which is then ignited. This combustion enables pistons to move and your engine to run. Spark plugs are therefore the starting point of engine functioning.

Spark plugs also extract heat from the combustion chamber and transfers it to the vehicle’s cooling system. These high temperatures mean your spark plugs need to be manufactured from quality products, otherwise they won’t stand the heat and could malfunction.

Their presence is essential and their quality is vital. Low quality spark plugs may quickly wear out; this can leave you in the lurch without warning. High-quality spark plugs last thousands of miles so you don’t have to change them frequently. In some modern cars, spark plugs are quite expensive so you need to make sure the correct ones are installed to last you a long time.

What should I look for in buying spark plugs?

When you’re looking for spark plugs you need to keep the following guidelines in mind:


Vehicles differ in size and engine design. Make sure you purchase spark plugs that will fit inside your vehicle’s cylinder head.


Most likely you’ll need Platinum or Iridium plugs. Make sure you choose a brand which uses quality materials during manufacturing. This determines how quick the spark plugs respond and how long they’ll serve you well.


Do you run a super-charger and need the best spark plugs for horsepower? Or do you have a Honda Accord and just want the best spark plugs for gas mileage?

High quality spark plugs will burn off residue from the combustion process so you don’t have to clean them constantly. You can change your spark plugs yourself, but otherwise you can get it done during regular vehicle servicing.

How often do you need to change your spark plugs?

Iridium plugs can last up to 125,000 miles and Platinum is close behind at 100,000 miles. But if you’re running a turbo-charger or high performance engine the combustion is often increased which means more wear on your plugs.

Your car manual will give you the best estimate. However, if any of the following occurs you may need to change them sooner:

6 signs that you need to change your spark plugs

Idling troublesdirty plug need replaced

The sound you hear when your car idles should be smooth and consistent. If idling sounds jittery or makes your car excessively vibrate, get your spark plugs checked immediately.

Starting problems

Are you used to your car only starting on the fifth try? Better get your spark plugs checked. Worn plugs won’t be able to start your car, and it can also drain your battery power.

Engine misfiring

Your car may run, but it might experience occasional misfires during your driving. With worn spark plugs, all cylinders can’t function properly. You also run a risk of increased emissions.


If your vehicle starts and stops intermittently, your spark plugs may be faulty. Your vehicle will jerk forward and slow down without warning, which is dangerous and frustrating.

Fuel consumption problems

As your spark plugs deteriorate over time, their efficiency influences fuel economy. It can lower efficiency up to 30%, but changing your spark plugs will quickly fix the problem.

Can’t accelerate

If your vehicle drags more than usual when you step on the accelerator, it may be your spark plugs that aren’t optimally working.

If any of these occur, you should have your spark plugs immediately checked; cleaning or replacement may be necessary. If you don’t attend to them, it may result in damage to your car, or danger while driving.

Top Spark Plugs Reviewed

Now you know why you need spark plugs and what to look for. Below are some suggestions for excellent options so you can discover the best spark plugs for your vehicle.

The Best OEM Spark Plug Replacement: Denso (4504) PK20TT

Denso offers many automotive parts to the public. You can be sure the company’s planning and manufacturing are backed by in-depth knowledge and research. These spark plugs are aimed at improving vehicle performance in many ways.

We suggest this site to make sure the Denso will fit your car:

Let’s look at a few highlights.


  • Your vehicle will have improved fuel economy when these replace your current spark plugs
  • You’re assured of a quality spark plug, thanks to a purified alumina powder insulator. This heightens the strength of the power surge and also improves the spark plug’s conductivity. Denso spark plugs can handle high amounts of stress and extreme temperatures
  • The ground electrode which is responsible for the essential sparks is enhanced with titanium
  • Denso uses twin tip (TT) technology:
  • TT technology means there’s less obstruction for sparks. Your car will have far less misfires
  • TT technology makes your car more fuel efficient and causes less CO2 emissions
  • These spark plugs are available in a variety of sizes. You need to ask the dealership to match your vehicle’s model with the correct type
  • These spark plugs come at a lower price than other leading brands, but you still receive exceptional quality parts


  • Some vehicle owners prefer iridium to platinum spark plugs
  • Vehicle manufacturers offer you branded spark plugs designed by themselves. While this brand may be a more affordable option, if your car is not of this brand, you run the risk that the plugs will be slightly different in size than your vehicle’s original plugs.


Denso offers vehicle owners a high-quality spark plug. This item contains exceptional materials to withstand the pressure and heat, but whether it fits your particular vehicle is the question. It may be smart to have them compared by a professional mechanic, rather than attempting the process on your own.

*Update 10-15-2017

Vince tested these Denso plugs out on a 2004 Toyota Camry and the results were pretty impressive! Check out the full Denso PK20TT Platinum Spark Plug Review


Best Spark Plug for Gas Mileage: NGK 3403 G-Power

These platinum spark plugs were designed to increase horse power and lower emissions. We’re not sure how much HP is actually increased, but some of our buddies swear that their “seat dyno” can feel more power. Haha, so take that for what you may 🙂

NGK has an excellent name in the vehicle industry for more than one reason. NGK offers high- quality products and when you see this item’s price you’ll love the affordability. This item comes in packs of 6, which makes it ideal when it’s time to swap all the spark plugs in your car. If only one is faulty though, you unfortunately have a higher expense than necessary. Be sure to use their quick lookup tool to make sure the G-Power will fit your car or truck: NGX spark plug lookup

What will you love about these spark plugs?


  • This is a platinum spark plug designed to improve fuel economy and reduce emissions.
  • The plugs are available in a variety of sizes. You need to make sure it fits your car’s engine!


  • More expensive than most platinum plugs due to the claim for “lower emissions” and better fuel mileage


NGK’s reputation exists for a reason, and you can trust this manufacturer for quality and durability.

Check out the hands-on review that Mike did on these plugs if you’re on the fence: NGK G-Power Review

Best Professional Platinum Spark Plugs: ACDelco 41-962

Dual platinum tips help the ADDelco deliver a clean spark and long life. It’s not uncommon to see these plugs keeping cars with 200,000 miles chugging along!

ACDelco is another brand which features high on car lovers’ lists. The company is known for the excellent parts it provides to the motor industry. You can consider this as a wise option when you’re in need of new spark plugs.


  • These spark plugs will work well for a long time, because overall corrosion is kept to a minimum thanks to the following features:
  • The dual platinum tip—Less corrosion will take place at the tip even with the high temperatures and combustion taking place around it
  • The shell of this plug is covered in a corrosion resistant substance
  • Less power (lower voltage) is needed to initiate a spark. This is beneficial for saving your car’s battery life. This is thanks to the platinum center electrode
  • One problem with spark plugs occurs when the spark gap changes; this could cause misfires. Luckily, this spark plug is designed and the metal fortified so the distance stays consistent throughout its use. This means you will have fewer misfires and the same amount of power will always be necessary to create enough spark to result in combustion
  • The seal of the spark plug helps minimize compression leakage and reduce radio frequency interference which could damage your engine
  • Though this plug incorporates modern technology, it can also be used on older vehicles
  • You can drive up to 100,000 miles before it’s necessary to change an NGK spark plug. This is dependent on how you handle and care for your car


  • Iridium is more durable than platinum. If you prefer iridium plugs you may want to consider purchasing another product
  • If your vehicle isn’t manufactured for NGK spark plugs you run the risk that they won’t work as effectively as your manufacturer’s original or recommended brand.


NGK is an excellent brand to consider for your vehicle. You’re guaranteed high quality, and this product’s additional features in terms of its seal and corrosion protection will enhance its functionality further.

Best Iridium Spark Plug for the Price: NGK Iridium IX

We couldn’t leave this list with only Platinum plugs, so here is one of our favorite and top Iridium plug – NGK once again brings it home!

If you want spark plugs for performance and buttery idling smoothness, then Iridium plugs are the go-to. Prepare to pay up to three times (or more!) for Iridium vs Platinum, but they’ll usually last longer, deliver more horsepower and breath new life into your car!

Some people swear by the ACDelco Iridium plugs, but we love the NGK.


  • Thanks to its intricate wiring this sparkplug requires very low voltage to perform its task. This translates into power savings for your car and better battery life
  • The center is laser welded with a 0.6mm tip
  • The center is iridium tipped
  • The ground electrodes are manufactured from double iridium
  • NGK offers a warranty on its products. If you do run into trouble there’s an excellent chance the company will help you sort it out through repairs or replacements. This depends on the type of problem you experience.
  • The design of these spark plugs causes insulation of the chambers via ribbed insulation grooves. This means there is a smaller chance your spark plugs will misfire
  • Easy to install


  • Iridium is a more expensive spark plug option compared to Platinum plugs.
  • You always need to make sure the spark plug is compatible with your car in terms of size. You don’t want to be left with expensive parts you can’t use.


Sometimes a high price is a sign of exceptional quality. That is the case with NGK Iridium IX’s. The manufacturer makes it easy for vehicle owners to look after their cars with very little maintenance, and even installation is effortless. If you can afford these plugs, get them.

Best Spark Plug Wire Set: ACDelco 9748RR Wires

Your spark plugs won’t perform their job if they’re not connected to a proper wire set. When your engine starts misfiring, you may want to check for cracks in the spark plug wires.

ACDelco offers you this wire set if your car’s needs replacement. The company proudly deals with most major vehicle manufacturers, so your car will surely function properly if you install these. What makes them so sought after?


  • These wires can withstand high temperatures thanks to fiberglass and silicon insulators
  • 96% of vehicles will be able to use them
  • The design of these wires helps make sure that the connection is watertight


  • Using different brands may become problematic, and it may be smart to use these wires only when your vehicle is manufactured with them
  • There are “fakes” being sold by some stores. If you purchase these, make sure the buy from the “fulfilled by Amazon”

thinking frog

Leaving Thoughts

So there you have it. The best spark plugs that you can buy for your car or truck. There are a ton of options out there and we hope this buying guide has helped you! If you have any questions, leave a comment below, or contact us!

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