Do Motorcraft Spark Plugs Need Anti Seize [Essential Facts to Know]

Anti-seize is used on Motorcraft spark plugs to prevent seizing and corrosion during installation and use. This ensures optimal engine performance and longevity.

But do Motorcraft spark plugs need anti seize?

Motorcraft spark plugs don’t need anti-seize due to the nickel plating on them. It over-tightens the pins and causes other issues, such as damage to the cylinder head and the spark plug thread resulting in misfires. It also damages the engine and can leak the gas combustion. 

Read on to find out the essential facts you need to know about Motorcraft spark plugs and anti-seize.

Do You Need Anti-Seize on Spark Plugs or Not?

Motorcraft spark plugs
Source: shutterstock

Anti-seize on Motorcraft spark plugs is not suggested since they are designed to self-lock. It can cause electrolysis as the lube can interfere with the heat transfer. As a result, the central electrode will run at a higher temperature and show incorrect torque readings. 

Applying anti-seize alters torque values up to 20%, increasing the thread breakage risk or stretching the metal shell. Furthermore, using anti-seize on Motorcraft spark plugs can cause corrosion, over-tightening, poor electrical connections, and decreased heat transfer.

Also, there can be extended PCM relay issues if it results in other failing components elsewhere. Many experts advise using anti-seize on spark plugs made from aluminum or with a projected tip. This is because it can protect them from seizing and make them easier to remove. 

However, it is always best to consult a professional mechanic or the manufacturer before using any products on spark plugs.

7 Reasons Why Motorcraft Spark Plugs Don’t Need Anti-Seize

Motorcraft Spark Plugs Don’t Need Anti-Seize
Source: shutterstock

Motorcraft spark plugs are some of the most durable and reliable in the market today. One key feature that makes Motorcraft spark plugs so dedicated is that they don’t require anti-seize.

Reason 1: Pre-Applied Anti-Seize Compound

Motorcraft spark plugs have a special anti-seize compound pre-applied to the threads. This compound is a nickel-based lubricant designed to prevent corrosion and seizing of the spark plug threads.

This helps to reduce the chances of seizing during installation. This means that they do not require any additional anti-seize compound to be applied before installation. 

This particular lubricant is applied to the threads before inserting it into the cylinder head. This compound helps avoid galling, seizing, and cross-threading of the spark plug and reduces the torque necessary for tightening the spark plug.

Reason 2: Overtightens The Spark Plugs Affecting The Torque

The pre-applied anti-seize compound helps ensure the spark plug is tightened correctly when installed. If more anti-seize is added to Motorcraft spark plugs to achieve better friction, it could result in overtightening.

Overtightening spark plugs can lead to several problems, such as over-torquing the spark plug. This can cause the spark plug to be forced too far into the cylinder head. This can damage the spark plug and cause ignition problems.

If you overtighten a wet spark plug thread to the dry torque values, the spark plug head can break and cause the spark plug to become too hot. This potentially leads to detonation, similar to how f150 grinding noises hit the system incorrectly. 

This can lead to the spark plug threads becoming brittle. Eventually, the engine will misfire. 

Following the manufacturer’s instructions for proper installation and torque specification is essential to avoid these issues.

Reason 3: Damages Cylinder Head Internal Threads

Over-torquing can also cause damage to the internal threads of the cylinder head. This is due to the distortions in the plug from the constant rubbing. The small gaps between the lines can strip easily with added anti-seize. 

Over-torquing spark plugs can also cause them to be over-compressed, leading to the spark plug failing to create a good spark or even cracking due to the extra pressure. If there is any issue with the components that start the engine, anti-seize can be used, but for Motorcraft, it is not recommended. 

Reason 4: Damages The Spark Plug’s Thread And Sealing Surfaces

Anti-seized spark plugs can damage the thread and sealing surfaces because of their soft metal composition. When the pin is tightened, the anti-seize can become compressed, causing it to fill in the gap between the spark plug threads and the head of the spark plug. 

This reduces the surface contact between the spark plug and the head resulting in a weakened seal. As a result, the loss of spark plug torque increases combustion gas leakage, and a decrease in the spark plug’s performance can occur.

Anti-seize can also react with the spark plug’s insulator and electrode. This results in a loss of spark plug performance due to decreased electrical conduction. This can lead to a decrease in engine performance and increased engine emissions. 

The anti-seize can also contaminate the spark plug’s firing tip, resulting in a decrease in the spark plug’s ability to ignite the air and fuel mixture. 

Reason 5: The Spark Plug Can Misfire

The spark plug may experience a misfire if it is subject to improper friction. When anti-seize is applied to a Motorcraft spark plug, it can cause it to misfire. This is because the anti-seize can act as an insulator, preventing the spark from jumping the gap in the spark plug and igniting the fuel-air mixture in the cylinder. 

The spark can even be dampened or otherwise weakened by the presence of the anti-seize. This can lead to a misfire, resulting in a decrease in engine performance and efficiency.

Reason 6: Changes The Heat Rating To Damage The Engine

Using anti-seize on Motorcraft spark plugs can help to stretch the metal shells, which happens with overtightening. The stretching of a metal shell can alter its heat rating, potentially leading to pre-ignition damage to the engine. 

When a metal shell is stretched, it can cause a decrease in the material’s tensile strength. This means as the heat rating is altered, the ability of the material to withstand high temperatures decreases. 

This can cause the metal to become less resistant to heat, damaging the engine. 

Reason 7: Leaking of Combustion Gases

Applying anti-seize to Motorcraft spark plugs can cause combustion gas leaks due to over-tightening spark plugs. Excessive torque can damage the threads of the spark plug. This leads to a loose connection between the spark plug and the cylinder head. 

It creates a gap between the spark plug and the cylinder headband the combustion gasses escape past the spark plug.

It is recommended that spark plugs be inspected periodically and replaced as necessary. Regular maintenance of spark plugs can ensure proper performance and prevent combustion gas leaks.

Best Ways To Ensure Motorcraft Spark Plugs Don’t Seize

Checking and adjusting the spark plug gap and replacing worn wires can help prevent seizing. But there are other things to ensure that Motorcraft spark plugs don’t seize up and cause engine failure. So, carrying the best spark plug maintenance practices is essential. 

Step 1: Maintaining Your Car to Avoid Spark Plug Seizing

Have regular maintenance- changing the oil and oil filter, checking the spark plug gap, and replacing the plugs when worn or corroded. 

A dirty air filter can also cause spark plug seizing, so ensure the filter is regularly replaced. Clean the dirty air filter by rinsing it in warm water and scrubbing off dirt or debris with a mild cleaning solution. 

Step 2: Use the Correct Grade of Motor Oil

Use the correct grade and type of motor oil. Using the wrong grade of oil can cause the spark plugs to seize up. Using the right oil for your car is essential, as it will help keep the spark pins clean and free of dirt and debris. 

When choosing motor oil for your vehicle, check your owner’s manual for the recommended type and grade of oil. 

Step 3: Spark Plug Gap Should Be Correctly Set

Ensure the spark plug gap is set correctly; otherwise, it can cause the plugs to seize up. The gap should be checked and adjusted periodically to ensure optimal performance. 

To ensure the spark plug is set correctly, check the spark plug gap specification in the vehicle’s owner’s manual. Then, use a spark plug gap tool to measure the gap between the spark plug’s electrodes. If the gap is too large, use a feeler gauge to adjust the opening to the correct size. 

If the gap is too small, remove the spark plug and use a spark plug gap tool or a small flathead screwdriver. With this, you can gently spread the electrodes apart until the gap is the correct size. 

Step 4: Pay Attention To The Spark Plug Wires

Over time, the wires can become worn or brittle, which can cause the spark plugs to seize up. Therefore, it is essential to replace the spark plug wires when they become worn. 

To ensure your spark plug wires are in good condition, visually inspect them for any signs of damage, such as cracking, splitting, or fraying. Measure their resistance with an ohmmeter and ensure they are securely attached to the spark plugs and free from obstructions. 

Check for any arcing or sparking from the wires and ensure they are the correct length for your vehicle. 

By following these simple steps, you can help ensure that your Motorcraft spark plugs don’t seize up and cause engine failure. 

Frequently Asked Questions (FAQs):

Where should you never apply lubricant or anti-seize on a spark plug?

You should never apply lubricant or anti-seize on the threads of a spark plug. Doing so can cause the spark plug to become loose over time, potentially resulting in an engine misfire.

Are Motorcraft spark plugs different from others?

Yes, Motorcraft spark plugs are different from others. They are designed with a patented surface configuration that helps reduce gap erosion and misfires. They also feature a stainless steel shell that helps reduce corrosion and prolong the life of the spark plugs. 

What type of engine is Motorcraft spark plugs best for?

Motorcraft spark plugs are best suited for gasoline engines. They are designed to deliver reliable performance, easy installation, and long-lasting durability. They are great for most automotive applications and offer optimal performance with high-performance engines.


So, do Motorcraft spark plugs need anti-seize? The simple answer is no. Motorcraft spark plugs do not require the use of anti-seize lubricant. However, ensure that the spark plug remains secure and will not become loose or corroded over time. 

Bye for now!

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