Dielectric Grease – 4 oz Brush-Top Jar

The transparent shield that keeps every connection firing strong

Flickering headlights, weak cranks, and random sensor codes often trace back to one culprit: moisture creeping into electrical contacts. A thin coat of dedicated dielectric grease creates an invisible, non-conductive barrier that locks acid fumes, salt spray, and road grime out of your wiring—no more white fuzz, no more voltage drop. Our 4 oz brush-top jar gives mechanics and DIYers a shop-sized supply of premium silicone dielectric compound that stays put from polar-vortex winters to blistering summer track days.

Why choose 4LifetimeLines™ dielectric grease over “one-grease-fits-all” pastes?

Most multipurpose greases melt at 350 °F, conduct electricity, or break down under battery acid. By design, our high-purity silicone dielectric grease:

• Insulates up to 25 kV/mm—prevents arcing across spark-plug boots and coil-on-plug boots.

• Resists -40 °F to 400 °F—won’t thin in July or harden in January.

• Repels water, salt, and most chemicals—ideal for marine, off-road, and snow-belt vehicles.

• Maintains rubber & plastic elasticity—no swelling of grommets or O-rings.

• Sensor-safe—will not poison O2 sensors or affect air-fuel readings when applied correctly.

Bottom line: one coat today can save hours of chasing phantom misfires tomorrow.

What’s inside the jar

• 4 oz (118 mL) silicone dielectric grease—enough for hundreds of connectors.

• Built-in brush applicator keeps workbenches clean and caps off tight—no misplaced lids.

Where dielectric grease makes the biggest difference

Three-step application (takes less than a minute)

1. Clean—Spray contact cleaner, then dry with compressed air.

2. Brush—Dip applicator and coat mating surfaces with a paper-thin film. A little goes a long way.

3. Assemble—Seat connector fully. Wipe excess from the exterior for a factory finish.

Need a visual? Our 90-second tutorial is embedded below or find it in the Knowledge Garage blog.

Technical specifications

Built-in internal links drive performance and SEO

Looking for rust-proof brake tubing? See our brake line kits to pair electrical reliability with hydraulic safety. Need high-heat thread protection? Grab our Industrial Anti-Seize Lubricant while you’re here. These contextual links help customers—and search engines—discover the right tooling for every service.

The 4LifetimeLines™ difference

• Made in the USA with strict batch QC.

• Lifetime satisfaction guarantee—if corrosion sneaks past the barrier, we’ll replace or refund.

• Same-day shipping on orders placed before 2 p.m. EST from our US warehouse.

Ready for worry-free connections?

Add our dielectric grease to your cart now and protect every harness, battery, and spark plug from the elements—because reliable power starts at the connection.