Top 5 Best Spark Plugs for Mustang V6 [Review Guide] In 2021

An efficient spark plug is needed for your mustang v6 engine to work smoothly. It helps to pass the electricity to the combustion chamber from the ignition system.

Unfortunately, after a long time of usage, the spark plugs might get bad. If you get the symptoms of a bad spark plug, then you must change it to keep your engine health to its maximum.

In this article, I will discuss the best spark plugs for Mustang V6 features and how to choose one effortlessly.

What are the best spark plugs for Mustang V6?

NGK 3403 G-Power Platinum Alloy Spark Plug TR55GP is the best spark plug for mustang v6 with multiple remarkable features. Well, you might be wondering what makes it the best one. The power and quality provided by the NGK make it so much better than others. Moreover, the capability of self-cleaning temperatures ensures durability and better performance. Who does not want that, right?

Additionally, it has G-Power in it. This G-power makes sure that the acceleration is more significant with a better fuel economy. If you are looking for faster acceleration, longer lifespan, and many other features, this will be the perfect match.

ProductKey Features
NGK 3403 G-Power Platinum Alloy Spark Plug TR55GPCore material is platinumHeat range 5Pre-gapped of 0.06
Motorcraft SP-520 Spark PlugMaterial is double platinumHeat range 6Budget-friendly
Bosch Automotive 9660 Double Iridium OE Replacement Spark Plug24% less voltageHeat rang 84-times longer life
NGK 3951 V-Power Spark Plug TR-55, 1 Pack  Rises fuel economyMaterial is copperHeat range 5
Motorcraft SP-412 Spark PlugHeat range 2Nickel material100,000-miles longevity

5 Best spark plugs for Mustang V6 Review in 2021

#1. NGK 3403 G-Power Platinum Alloy Spark Plug TR55GP

If you are looking for plugs with the topmost advantages but within a handy budget, NGK 3403 Plug can be the one for you. Moreover, who wants hassle while installing it? This spark plug takes care of that. Besides being easily installable, it nourishes your mileage by increasing it.

Additionally, the platinum tip and alloy ensure durability. The incredible thing about this spark plug is it has a G-power. A G-power itself handles and ensures that the vehicle performs well with a faster start and so many others. It is again in a minimal budget an excellent spark plug to use.

Key Features

  • Easy installation
  • Gas mileage will increase
  • Lower CO2 emissions


Material: The core material of this spark plug is Platinum. Platinum has a top melting point of as much as 3215°F that helps it work efficiently even in a considerable heating situation.

Fitment: NGK 3403 G-Power Platinum Alloy Spark Plug TR55GP mustang fitment is 1991-2008. If you own a Ford Mustang produced between 1993-1004, then definitely it’s for you.

Gap: This one comes with a gap of 0.06 inches.

Heat range: The spark plug provides you a heat range of 5. So that you don’t need to worry about the heating up of your engine, the spark plug will give perfect ignition even on significant heat.

Center electrode: This spark plug has a center electrode of copper. A copper core center electrode helps to shift heat at high speed.

Metal plating: In this spark plug it has trivalent metal plating. It ensures that the spark remains safe from any sort of anti-corrosion and anti-seizing properties.

Durability:  Everyone needs a durable spark plug. And this spark plug comes up with high durability that gives 30k-40k miles longevity.


  • The NGK 3403 Plug provides you comparatively superior acceleration to others.
  • It’s a budget-friendly spark plug.
  • The 53mm insulator helps to survive the spark plug from overheating.
  • Better fuel economy as it will increase at least 1-2 MPG from your previous one.


  • Sometimes it might misfire after getting old.

#2. Motorcraft SP-520 Spark Plug

If you are looking for any latest products with a multi-rib insulator pr, then Motorcraft SP-520 Spark Plug will be one of the best options for you. While looking for a spark plug, if it gives 100,000-mile services and helps to improve durability, this can make your vehicle smoother and faster.  It makes sure that your vehicle has less firing voltage.

However, the double-platinum feature of this spark plug also ensures a platinum pad on each electrode. Moreover, the heat range 6 t is higher than a regular one. Lastly, Considering the price, it gives a much more efficient job with perfect features.

Key Features

  1. Easy installation
  2. 100,000-mile effortless service
  3. Improved durability


Material: The material of this spark plug is double platinum. Due to being 2-3 times greater than the single platinum increases its value. However, platinum is more rigid than any other metal, so it increases its durability.

Center Electrode: The core material of the center electrode is copper that ensures extreme longevity of the spark plugs.

Fitment:  Motorcraft SP-520 Spark Plug fits 2011-2017 year vehicles.

Gap: Motorcraft SP-520 Spark Plug has a gap of 0.050.

Heat range: The heat range of this spark plug is a bit more than others. It has a heat range of 6.

Durability:  Spark plugs with more extended durability get priority over others automatically. This is why Motorcraft have ensured improved durability of 100,000-mile in their spark plug.


  • Reduces the firing voltage due to being cylindrical in shape.
  • The quality materials assure less erosion.
  • It has a superb multi-rib insulator that ensures there is no leakage occurring.
  • You will be getting good spark plugs at the market’s best rates.


  • On multiple cylinders, it might cause misfiring.

#3. Bosch Automotive 9660 Double Iridium OE Replacement Spark Plug Up

Who doesn’t want a 4X longer life with their new spark plug? Well, everyone does! And it is only offered by Bosch 9660 spark plugs. It comes with double iridium that ensures a longer lifespan of the spark plug.

If you want a high heat range spark plug, then this can be on your top list. Additionally, the higher performance with a quick and straightforward installation of the spark plug seals the deal. Thus along with these and so many other features, it makes it one of the best spark plugs.

Key Features

  • Quick installation
  • Carry out 4X longevity
  • Double iridium


Material: The core material of this spark plug is iridium. Iridium is a more rigid and more robust metal. Along with that, the skill of resistance is magnificent.

Fitment: If you own a mustang between the 1996-2005 model, then you can use it effortlessly.

Gap: Bosch Automotive 9660 Double Iridium comes with a pre-gap of 1 mm.

Heat range:  This double iridium spark plug provides a heat range of 8. It’s a significant number for any spark plugs. If you run your vehicle frequently, it will be an excellent choice for you as it gives the market-top heat range.

Durability:  The spark plug is double iridium, and it should comfortably last for 100k miles. Moreover, it does provide more extended life assurance.

Nickel-Plated: The spark plug has a nickel plate on it. Due to the presence of nickel plates, it ensures that you get a longer lifespan without any erosion.


  • The fuel economy automatically gets improved after inserting the spark plug.
  • Due to the delicate wire design, extraordinary ignitability arrives
  • It has a copper core that lets the heat range be higher; thus, it does not allow any pre-ignition.
  • The voltage demand is less in comparison because of the fine wire firing pan.


  • Sometimes the engine might sound a little rough.

#4. NGK 3951 V-Power Spark Plug – TR-55

We all want spark plugs that can raise our fuel economy. Gradually, spark plugs with a solid copper core and nickel tipped on them enhance durability. If you like these features in their spark plug, then the NGK brand has saved your back with their NGK 3951 V-Power spark plug.

Key Features

  1. Extraordinary ignitability.
  2. Rises fuel economy.
  3. Longevity upto 30k miles


Material: The core material of the NGK 3951 V-power spark plug is copper. If you’re on a budget and not a heavy rider, then it’s for you.

Fitment: It fits the Mustang model 1998-2008 year.

Gap: NGK 3951 V-power spark plug has a gap of 1.5 mm.

Heat range: Like any other spark plug, this spark plug also has a good heat range. The heat range of this one is 5.


  • In comparison to other spark plugs, it gives you lower CO2 emissions.
  • Against any sort of electrical and chemical wear, it is extremely durable.
  • NGK 3951 V-power spark plug has a triple gasket sealing which does not let the spark plug have any combustion gas leakage.
  • It has a copper core, which has the ability to eradicate heat.
  • The spark plug has a superb insulator in it, which takes care that there is no misfiring.


  • Sometimes the gap might not just fit perfectly. You might need to adjust it manually.

#5. Motorcraft SP-412 Spark Plug

The Motorcraft brand introduces a spark plug that can provide a greater level of voltage. Not only that, it gives you a service of 100,000 miles. If you want to buy a spark plug that increases the mileage, you should try on this SP-412 model.

Key Features

  • Easily accelerated.
  • Better gas mileage
  • 100,000 miles durability


Material: The core material of the Motorcraft SP-412 Spark Plug is nickel. Even the center electrode has nickel on it.

Fitment: It fits all the Ford Mustangs that are produced between 2002 to 2008.

Gap: This spark plug has a pre-gap of 0.054 inches.

Heat range: Motorcraft SP-412 Spark Plug has a lower range of heat number than others, which is 2. But considering the budget and usage, it would be a perfect one for you.


  • This spark plug carries maximum voltage, which makes it extraordinary from others.
  • It is more durable because it prevents the engine from corrosion.
  • It increases the performance of the engine more than before.
  • This also ensures that there is no antifoul.


  • It has a lower heat range.

5.0 Mustang spark plugs and Buying Guide with comprehensive lists.

iridium spark plugs for v6 mustang

11-16 Mustang 3.7 V6 Spark Plug Change


I discussed the best spark plugs for mustang v6 along with some astounding advantages of theirs. If you want to make your engine like a new one, you should change your spark plug when showing you the symptoms. All of the spark plugs discussed above have unique features. You can buy the one according to your preference.

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