what is dielectric grease used for?
Aside from sealing spark plugs, dielectric grease is often used to lubricate other engine-related parts, such as rotors, distributor caps, and speedometer cables. It is also employed in many other situations where electrical connections may be exposed to moisture and dirt.
Dielectric grease is a non-conductive, silicone grease designed to seal out moisture and, therefore, prevent corrosion on electrical connectors. Being non-conductive, it does not enhance the flow of electrical current.
Enerpulse emphasizes the use of dielectric grease on the terminal end of the spark plug. This is clearly a conductive and critical part of the plug. I also add dielectric grease to the insulator between the shell and terminal to create a moisture barrier for the spark cable boot.