Best Dielectric Grease for Coil Pack (2026)

A coil pack that misfires on a damp morning usually points at the boot, not the coil. Moisture creeps into the connection, the spark finds a shorter path, and the engine stumbles until the boot dries out. A thin film of dielectric grease seals that connection, and this guide compares the best dielectric grease for coil pack jobs by size, temperature range, applicator and pack.

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Picks for the garage

#	Product	Shop Score	Buy
1	AGS Silicone Dielectric Grease for Electrical	9.5/10	Buy on Amazon
2	BTAS Electrical Dialectical Grease for Spark	9.5/10	Buy on Amazon
3	AGS Dielectric Silicone Grease, 4 oz Tube	9.4/10	Buy on Amazon
4	BUFFZIT Dielectric Grease for Electrical	9.3/10	Buy on Amazon
5	Permatex 22058-6PK Dielectric Tune-Up Grease	9.3/10	Buy on Amazon

1

AGS Silicone Dielectric Grease for Electrical

AGS·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

An 8 oz brush-top can of silicone dielectric grease rated -40 F to 400 F, safe on rubber and plastic, with a brush in the cap.

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Pros

• 8 oz brush-top can with a brush in the cap
• Rated -40 F to 400 F for ignition systems
• Safe on rubber, plastic, metal, ceramic and glass
• Made in the USA by AGS since 1931

Cons

• No warranty term is stated
• 0.5 lb can is the heaviest single container here
• Brush in the cap only, no squeeze tube in this listing
• No shelf life is stated

2

BTAS Electrical Dialectical Grease for Spark

BTAS·9.5/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

2 tubes of 1 oz each, PTFE-enhanced silicone dielectric grease rated -40 F to 428 F, food grade.

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Pros

• Rated -40 F to 428 F, the widest range here
• 2 tubes of 1 oz each in the pack
• PTFE-enhanced silicone formula, food grade
• Compatible with metal, rubber, plastic and O-rings

Cons

• No warranty term is stated
• Only 1 oz in each tube
• No applicator is stated
• Title spells the product 'Dialectical' while the bullets say dielectric

3

AGS Dielectric Silicone Grease, 4 oz Tube

AGS·9.4/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 4 oz tube of silicone dielectric grease for spark plug boots and coil connections, meeting OEM specifications.

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Pros

• 4 oz tube for spark plug boots and coil connections
• Meets OEM specifications
• Also sold in a 1.25 oz tube
• For sensors, ECM plugs, bulb sockets and battery terminals

Cons

• Spec table lists 10.0 in dimensions that do not match a 4 oz tube
• No temperature range is stated
• No warranty term is stated
• Tube only, no brush-top version in this listing

4

BUFFZIT Dielectric Grease for Electrical

BUFFZIT·9.3/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 20g tube of red waterproof dielectric grease with a brush applicator for spark plugs and battery terminals.

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Pros

• Brush applicator included
• Listed as waterproof and non-conductive
• For spark plugs and battery terminals
• 0.0625 lb, the lightest here

Cons

• No temperature range is stated
• No use instructions in the listing
• No warranty term is stated
• Only 20g in the pack

5

Permatex 22058-6PK Dielectric Tune-Up Grease

Permatex·9.3/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A pack of 6 tubes of 3 oz dielectric tune-up grease.

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Pros

• Pack of 6 tubes of 3 oz each
• Dielectric tune-up grease format
• 6 tubes cover repeated coil pack jobs
• 3 oz tube size stores easily on a shelf

Cons

• Bullets state only the brand name
• No temperature range is stated
• No applicator is stated
• No warranty term is stated

Compared on paper

We copy each listing’s rated specs exactly as the manufacturer gives them; as of 1 November 2026.

How the points were given

Each grease is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. No pick here states an electrical listing, so no safety points are scored, and no pick states a warranty term, so no warranty points are scored either. The rest of the score comes from what each listing states about size, temperature range, applicator and pack.

The displayed number is the weighted point total scaled linearly between 9.2 and 9.8. Earning more points is the only way up.

What the listings tell you

We read 5 dielectric grease listings. The AGS listings give the fullest picture, with temperature ranges, uses and applicator details, while the BUFFZIT and Permatex listings state little beyond size and pack. No pick states a warranty term or an electrical listing, and the AGS 4 oz tube is the only pick with a stated OEM specification.

Buying guide: the best dielectric grease for coil pack

Brush top or tube

The AGS 8 oz can has a brush in the cap, and the BUFFZIT tube has a brush applicator. The AGS 4 oz pick is a squeeze tube. The BTAS and Permatex listings state no applicator, so check the listing before the job if the applicator matters to you.

Temperature range

The BTAS grease is rated -40 F to 428 F, the widest range here, and the AGS 8 oz grease is rated -40 F to 400 F. The AGS 4 oz tube, the BUFFZIT tube and the Permatex pack state no temperature range, so their listings give no figure to compare against.

How much grease goes on a coil pack boot

The AGS listing says to brush on a thin film or coat the inside of the boot, then reconnect. It states no amount, so follow the thin-film instruction rather than filling the boot.

Where else the grease goes

The AGS listings cover spark plug boots, ignition coils, sensors, ECM plugs, bulb sockets, battery terminals and trailer and marine connectors. The BTAS listing adds O-rings and gaskets. The best dielectric grease for battery terminals guide covers the battery-terminal picks in more depth.

What the listings do not state

Several picks state no temperature range, and none states a warranty term. The BUFFZIT listing has no bullets at all, and the Permatex bullets state only the brand name. Where a listing is silent, this guide writes “Not stated” rather than guessing.

Garage Fit Check

• Check the applicator: the AGS 8 oz can has a brush in the cap, the BUFFZIT tube has a brush applicator, and the AGS 4 oz pick is a squeeze tube.
• Check the temperature rating: the AGS grease is rated -40 F to 400 F and the BTAS grease -40 F to 428 F, while the other picks state no range.
• Plan shelf space: the AGS 8 oz can measures 2.62 in by 2.62 in by 3.75 in, and the Permatex pick is a pack of 6 tubes of 3 oz each.
• Check the pack count: the BTAS pick comes as 2 pieces of 1 oz each.

FAQ: garage tools

How do you use dielectric grease on a coil pack?

Make sure the terminals, boots and connectors are clean and dry, brush on a thin film or coat the inside of the boot, then reconnect. That is the use the AGS listing states for ignition coils, modules, sensors, solenoids, bulb sockets and battery posts.

What is dielectric grease made of?

The greases here are silicone based, and the BTAS grease is PTFE enhanced. The AGS grease is safe on rubber, plastic, metal, ceramic and glass, and the BTAS grease is listed as compatible with metal, rubber and plastic.

Do you need dielectric grease for spark plugs?

The listings say to apply it inside spark plug boots and on ignition coil and module connections, where it seals out moisture and helps prevent voltage leakage, flashover and misfires. Whether a given plug boot needs it depends on the boot and the coil, so check what the listing states for the job at hand.

How much dielectric grease goes on a coil pack?

The AGS listing states a thin film, brushed on or coated inside the boot, and states no amount. Use the thin-film instruction rather than filling the boot.

Can dielectric grease go on battery terminals?

Yes. The AGS and BTAS listings list battery terminals among the uses, along with bulb sockets and trailer connectors. The battery terminal protector vs dielectric grease guide compares the two approaches.

Related: the best dielectric grease for battery terminals, the battery terminal protector vs dielectric grease, the best anti seize for spark plugs, the best battery terminal connectors and the best spark plug gap tool.