For starters, right off the bat, we need to tell you that dielectric grease is non-conductive. It is mainly a substance that improves conductivity by isolating highly conductive parts from leaking high voltages out of their intended housings. These include high-energy systems inside vehicles, such as battery terminals, ignition systems, headlamps, and even spark plug boots. So what is dielectric grease? The substance is also sometimes called tune-up grease and is a silicone-based grease with excellent water repellent properties and protection against corrosion. The compound does this by also protecting against dirt, dust, and moisture from reaching sensitive electrical components by coating the parts in a layer of the protective and non-conducting membrane. This is why the use of dielectric grease on electrical connections is quite widespread. Again, in order to be clear about what is dielectric grease, it is important to note that this compound is non-conductive. Instead, this dielectric compound is excellent in isolating high-current or high energy parts from touching other components that may weaken an electrical connection. As far as composition is concerned, it is made up of a silicone oil base and a thickener for more straightforward application.

Using a di-electric grease

Grease in its ordinary form is already useful, and dielectric grease adds another utility to this compound by allowing it to be used on a vehicle’s electrical systems, especially in high-energy systems. As you continue reading, we will be talking about where this beneficial compound is used in particular. Let us start with one of the most energy-demanding parts of an engine, the spark plugs. The compound prevents unwanted parts from having contact with each other and causes a short circuit. Arcing and leaking electricity that can be wasteful is also prevented simply by coating terminals with the substance. Once applied, it forms a fire and waterproof membrane, protecting rubber connectors and covers from becoming brittle. Furthermore, dielectric grease can be used on almost any electrical configuration and contraption, provided you have the knowledge and know-how to apply it correctly. Any exposed metal in a connection is a potentially dangerous leak point for high-energy current, and the application of dielectric grease seals it in. However, it is essential to note that dielectric grease can cut the flow of electrical current when misapplied, leading to problems in the process. You May Like Best Engine Assembly Lube Reviews

How To Apply Dielectric Grease To a Spark Plug Boot

When it comes to spark plugs, basic knowledge in how to apply dielectric grease to connectors should be handy. A huge part of what does dielectric grease do is to make sure electric currents stay where they should be. For spark plugs, simply coat the end of the rubber boot on a spark plug wire to cover the lip’s inside. What this does is prevent electricity from going outside the boot and leaking into the engine block. Without the help of spark plug grease, a vehicle’s engine may experience stuttering or may not even start at all. The application will also benefit from acting as a dye electric grease that will help in a much easier experience of sliding the boots in place. Furthermore, this grease has a high melting point and can sustain its viscosity even in high temperatures. Still, people are asking is dielectric grease conductive? The answer is that it is not the opposite, so it must be applied correctly.

Pros of using Dielectric Grease

If your purpose is isolating high-energy systems from leaking high voltage current out of their housing, dielectric grease is the go-to compound for it. The grease is especially suited for vehicle engines as the dielectric lubricant can withstand up to 500 F temperatures without changing its characteristics. In contrast, a car’s engine typically would hover in more or less 200 F of temperature. In short, it is a great way to insulate electrical connections. Preventing the build-up of what is called an insulative oxide layer is one of the ways on how to use dielectric grease, and this problem is notorious in vehicles and boats. The application varies but is mainly confined to multi-pin connectors and connections to instrumentation and the instrument cluster. In addition to giving a protective and insulating coat, the grease also acts as a grease, lubricating a connection’s plastic and rubber mating parts. These are parts that are commonly found on a car’s engine bay, and as such, dielectric grease on battery terminal, rotors, cables to the instrumentation, and even distributor caps for older vehicles are common. This lubrication property of a dielectric lubricant reduces wear and tear on parts, adding longevity of materials to its usefulness.

Cons of using Dielectric Grease

While dielectric grease can also act as a lubricant, its downsides are that it cannot be interchanged with other lubricants. As for the question of dielectric grease conductive properties, it really is not but rather a very good isolator from electrical components that should not be touching. The compound is highly specialized and can be used only with high-temperature areas and electrical components only. When asking is dielectric grease silicone, the answer is a yes. Being silicone-based has many advantages, but unfortunately, it can melt silicone-based rubber over some time. We can easily avoid this by ensuring that you do not use the compound on silicone-based connector covers and pin holders. Dielectric grease also produces formaldehyde at high temperatures. This makes it necessary to have that extra step of wearing protective equipment such as gloves, eye protection, and respirators before working with this compound. While this may be the case, these are by no means any deal-breakers, as the uses far outweigh the cons of this helpful component. Also you can help this video:

Dielectric Grease Applications

While dielectric grease has many uses, it excels in vehicles on land and especially in water. Engines run on electrical components alongside their mechanical functions, and here the dielectric grease is king. The compound is quite popular, especially in making sure moisture is kept out and easy to prevent corrosion. Battery terminals are notorious for attracting corrosion, but they also have complicated terminals that are very hard to fit with an appropriate cover. Cover or not, a simple dab and application of dielectric grease will work wonders and ensure that no dirt, moisture, or other contaminants get in contact with the terminals. More than acting as a seal, this automotive substance is quite helpful in high-energy components, particularly in spark plugs and how to contain their high-energy discharge. Improperly connected spark plug boots may lead to the high voltage generated by the spark plugs leaking out to the engine block. This can lead to your engine not operating properly, such as rough idling and starting at all. These vehicular problem symptoms can lead to much greater damage if unattended, and you would be glad to know that a simple application of dielectric grease inside the spark plug boots will prevent this from happening. Dielectric grease is also very useful in keeping a tight seal on connections in marine engine applications and even on land vehicles. All in all, the electrical components will have three layers of protection, keeping out corrosive elements from reaching the pins. It will have the plastic, the gasket, and the dielectric grease as the layers. Moisture cannot get into the rubber seals, and the viscous paste of dielectric grease coating the connections.

What’s the Difference Between Dielectric Grease and Lubricating Grease?

The most apparent difference between the two compounds is that dielectric grease has a much higher melting point than simple lubricating grease. As such grease will immediately lose its sealing and insulating properties once the engine starts to run and gets hot. AN engine bay is not a friendly place for lubricating grease that’s not designed to withstand high operating temperatures. In terms of where they are used, the regular lubricating grease is mostly used on components that have more or less stable temperatures. Another difference is that some standard grease compositions give them a certain amount of conductivity, unlike the silicone-based dielectric grease that stops the flow of electricity and insulates the components instead. DIelectric grease also offers resistance and does not quickly melt in water, ethanol, and mineral oil.

Frequently Asked Questions (FAQs):

Is Vaseline Dielectric Grease?

Vaseline is mainly a personal lubricant, among other things, and is petroleum jelly. On the other hand, Dielectric grease is a silicone-based grease and is specifically engineered for high-temperature vehicle areas such as the engine bay and sometimes within the engine itself. We need to emphasize never using Vaseline on any part of your car as it will not work as intended and could be downright dangerous. Additionally, Vaseline can conduct electricity, as opposed to dielectric grease being non-conductive.

Is Silicone Grease The Same As Dielectric Grease?

While they do share similarities, silicone grease just happened to be a lubricant with both water and fireproofing characteristics. Silicone grease is still marketed as a lubricant, while dielectric grease is intended to use specifically for electrical connections and components. In addition, there is no rating for the melting point of silicone grease, as this depends on the ratio of silicone oil and the thickener used, which means it varies per product. Dielectric grease is manufactured with exact specifications to withstand high-energy and high-temperature situations before losing its viscosity.

Does Dielectric Grease Improve a Connection?

Being non-conductive is critical in improving a connection, especially in high voltage applications like spark plugs. Without a coating of dielectric grease, there is a chance of moisture seeping into the plugs or current leaking into the engine block itself. This compound helps maintain a good connection by properly isolating parts that should not touch each other and preventing corrosion.

Can Dielectric Grease Cause a Short?

This has never happened in the history of dielectric grease application, as dielectric grease is non-conductive. It can, however, do the opposite and prevent a shortage. Shortage can also be caused by arcing electricity and corroded terminals. The application of dielectric grease prevents these from happening.

Can I Use Dielectric Grease On O-Rings?

O-rings can easily deteriorate by being dried up and brittle if left without protection. Dielectric grease is perfect for making sure that o-rings maintain the same suppleness that makes them effective. The lubricating action also ensures that abrasion is non-existent because of its waterproofing properties. O rings can also suffer when chemicals constantly contact them, and dielectric grease helps with this as it cannot be melted with ethanol, a major component of gasoline.

Can Dielectric Grease Be Used On Circuit Breaker?

When appropriately applied, dielectric grease can increase the efficiency of circuit breakers. Using the compound with care and proper knowledge is paramount because not all breaker parts should be coated. Some circuit breaker features need a constant and steady connection for them to work correctly, and an incorrect application may disrupt this connection. Having said this, dielectric grease can be applied to virtually any electrical setup to gain fire and waterproofing properties and protect the parts from corroding elements.


From here, the answer to the question is dielectric grease necessary is clear; it is an indispensable tool in making sure engines work as they should. The takeaway is that first, it should be applied correctly, and second, just like any other tool at the correct timing. Just a few things to note, though, before we let you go, dielectric grease is an insulator and not a conductive compound. This grease has a very high melting point and is more expensive than standard grease, so use it only as intended. We hope that with this article, you can more or less understand how a dielectric grease is applied and how it benefits and adds longevity to your vehicle engine. Use the grease only on exposed parts of the circuit where it is in danger of being corroded. As a parting word, also recognize that sometimes you need a certified mechanic, mainly for the right tools and safety reasons-and there is definitely nothing wrong when asking for help when it is required.