Rick's Free Auto Repair Advice

Posts Tagged: Dielectric grease

Dielectric grease on spark plugs and electrical connectors

Dielectric grease keeps water and corrosion out of electrical connections. Dielectric grease is used in automotive applications to prevent corrosion in electrical connections, lubricate rubber parts, and prevent spark plug boots from welding to the spark plug porcelain. It’s non-conductive, so when it’s applied to the inside of a spark plug boot it helps prevent “tracking” where high voltage fires down the porcelain portion of the plug to the metal shell where the voltage finds ground. What’s in dielectric grease? It’s made from a polydimethylsiloxane silicone oil base (as opposed … Read More


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