Best Spark Plugs for 4.0 Jeep – Choose only the best for your vehicle

Spark plugs are the perfect examples of “small things, big punch.” 

They are among the most essential components in a car because without them, you wouldn’t be able to start your car properly! They also eliminate heat from the combustion chamber and keep the vehicle cool. So, if your spark plug isn’t functioning properly, you will know immediately. And, this is something you shouldn’t procrastinate. A bad spark plug is dangerous! Make sure you buy the best replacement spark plugs immediately. 

Best Spark Plugs for 4.0 Jeep

Now, one point to remember here is that every jeep has different sets of spark plugs that you must buy. In this article, we are going to speak about the best spark plugs for 4.0 jeeps because we are getting a lot of questions about them. Let’s start.

1. NGK V-Power Spark Plugs (6 pieces)


The NGV spark plugs were made specifically for jeep models between 1997 and 2006. They are ideal for the L6 engine kit setup. Here are a few things you should know about these spark plugs:

  • They are very easy to install thanks to their insulator design and corrosion-resistant plating. You can remove them just as easily as well, when the need arises.
  • The spark plugs are durable and resist damage to a large extent as they have cold-rolled threads on the cylinder head. The metal plating that’s trivalent further helps this cause as it promises anti-seizing and anti-corrosion properties.
  • They have a five-rib insulator that avoids flashover and leakage. These features are very important because they prevent leakage and misfires.
  • They also boast of a broader heat range, better conductivity, and superior heat dissipation. 
  • The manufacturers promise better performance than standard and OEM spark plugs. This is why we recommend them as well. 

buy @ amazon

2. Autolite Iridium Spark Plugs for 4.0 Jeep


If you just need 1 spark plug and aren’t really looking for multiple pieces, we recommend the Autolite Iridium Spark Plug. It is available as a single plug or as packs of 4, giving you complete freedom to choose. Below are a few of its features:

  • It is made of a platinum alloy and has a 0.6mm fine wire center electrode. This is a huge USP because it directly enhances its ability to ignite.
  • The side wire technology that’s used on the spark plug is crucial as well because it resists general wear and tear.
  • It has been designed to promise durability and zero gap erosion. This makes sure that the spark plug lasts long and works well. Even the tip is plated with platinum.
  • It lives up to the OEM standard of function and design. You, in fact, won’t feel a difference between the standard plugs and this one.
  • The spark plug comes with a terminal nut and a motor seat gasket.

buy @ amazon

3. NGK V-Power Spark Plug (6 pack)

NGK V-Power

This set of NGK V-Power spark plugs is for Jeep Grand Cherokee models that were manufactured from 1999 to 2004. Let’s check out why you should buy these plugs:

  • The spark plugs fit L6 engines of the size 4.0/242. You can use them with any engine of the engine family AMC inline 6-cylinder.
  • It comes with excellent features such as lower emissions and good fuel economy.
  • It also has anti-seizing and anti-corrosion properties because it has a trivalent metal plating.
  • You can rest assured that it will stay safe even when exposed to chemical water and electrical water.
  • It also improves acceleration performance.
  • Other features are low voltage requirements, better ignitability, and great anti-fouling levels.
  • The tip of the electrode is made of a nickel alloy.

buy @ amazon

4. Champion Copper Plus Spark Plug

Here’s an Amazon’s Choice product that you will definitely love! The Champion Copper Plus Replacement Spark Plug is available as a pack of 1 for specific vehicles. Make sure you check compatibility before buying it. Also, please gloss through its features:

  • The electrode has a copper center. This controls Championthe heat range very well and ensures that the spark plug works well for a long time.
  • It comes with a patented ultra-seal coated shell that makes it resistant to corrosion.
  • It has been built keeping ISO and SAE standards in mind, especially when it comes to performance. So, you can be sure that it works well.
  • The semi-conductor resistor functions to give you the best RFI and EMI suppression.
  • These spark plugs have the ability to achieve the right temperature quickly and stay stable regardless of the engine load.
  • Please keep in mind that the plugs are not pre-gapped.

buy @ amazon

5. NGK 3459 Spark Plugs for 4.0 Jeep

NGK 3459

We haven’t come across anything negative about NGK spark plugs so far. All their products are of top quality and deliver what they promise. These particular spark plugs are the same. They live up to all expectations! Let’s find out more:

  • They fit all 4.0L jeeps, but we recommend that you check the model before making a purchase.
  • They have corrugated ribs that avoid flashover.
  • The insulator is made of alumina silicate ceramic. It ensures excellent heat transfer and great strength.
  • The spark plugs have triple seals, thanks to which you don’t have to worry about leakage at all.
  • The core, which is made of copper, works to remove excess heat.
  • You don’t have to worry about seizing or corrosion at all! This is because the spark plugs have trivalent metal plating.

buy @ amazon

No matter which spark plugs you choose from our list, you will have made the right choice! But, to ensure that you pick only the best one that suits your needs, please make sure you compare the options above before adding one to the cart.

If you have any doubts regarding any of the products we listed, please do not hesitate to contact us. 


My name is Bertha Mintz. I like to repair vehicle parts and modifid the vehicles. I have a small automotive garage. I sold the spark plugs, automotive accessories. To get more information visit my website.

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