Should I Use Anti-Seize On Spark Plugs? [When To Use!]

Anti-seize is placed on the threads of spark plugs to resist moisture and chemical corrosion. 

This silver or chrome-colored finish also helps in releasing spark plugs. Above all, anti-seize performs as a lubricant, altering torque values and increasing the risk of breakage. 

So, should you use an anti-seize on your spark plugs? Most spark plug manufacturers disagree. 

For NGK Spark Plugs, consumers don’t need to use anti-seize or lubricant as it’s “completely unnecessary and can be detrimental”.

Other spark plugs also have a well-coat which can perform the anti-seize job.  

However, consumer-based research like those of Tools Review by Real Mechanics revealed otherwise. Though it’s true, some spark plugs don’t need anti-seize; it is not completely bad to use; the claims stated. 

Real Mechanics found out that putting anti-seize is safe and can be useful. But one must first understand the concepts revolving around it so you can use them efficiently and effectively. 

Keep reading to know more about when you should use an anti-seize for your spark plugs. 

The Time You Should Use An Anti-Seize For Your Spark Plugs

In an interview in Babcox Media, Andrew Markel, magazine editor, explained when to use an anti-seize for your spark plugs. According to the editor, there are two spark plugs types: one that uses anti-seize and one that does not. 

Don’t use an anti-seize if a spark plug has a thread with nice shiny silver⁠ chrome-type coverings⁠.

This spark plug type is already equipped to perform the same duty as an anti-seize or is already covering everything needed. 

Generally, it deals with the spark plug aluminum or steel heads. 

Using an anti-seize in the thread of a chrome-type finish can damage the spark plug. The anti-seize could toss off the torque specs, break the threads, and spark plugs’ heads.  

On the other hand, if you have a spark plug with a black oxide finish, you can use an anti-seize. But you need the right amount to seal that torque for better performance.  

Frequently Asked Questions

What does an anti-seize do to my spark plugs? 

There are two important concepts of anti-seize that you should remember. The first is that anti-seize minimizes the friction coefficient, which reduces the value of your dry torque by 20%. 

Also, most spark plugs have a dry torque unless your manufacturer states otherwise. 

You must understand how to decrease torque values before putting an anti-seize in your plugs. Failing to do so could break your plug or damage other parts. 

Next is the amount of application and where you would apply the anti-seize. 

Ensure that you only apply a small anti-seize to the middle portion of the spark plugs’ threads. It will help you to achieve the optimum performance of these add-ons. 

What is the best anti-seize for my car’s spark plugs? 

Based on the research conducted by the Real Mechanics, a nickel-based anti-seize is the perfect option. Specifically when you need to use it in an automotive engine spark plugs. 

Generally, a nickel-based anti-seize has the best heat range and is most preferably used by technicians and experts. 

Why is the value of torque affected by the application of anti-seize? 

As said in earlier parts, torque values change because of the friction brought by the anti-seize. Its main compound functions as a lubricant, minimizing the friction between materials. 

This process adds more force to the preload of the spark plug. The tension between the cylinder head and the spark plug gives friction to hold each plug in place.