Spark Plugs platinum vs iridium

[yaris-me]

Originally Posted by 127.0.0.1

don't put dielectric grease inside the plug wires.

the grease doesn't conduct electricity, and for a large pulse
like a plug has, it can restrict it a bit (less metal-metal contact)
and overheat the wires.

dielectric is best for low voltage...like ordinary 12v or 5v electrical connectors
elsewhere in the vehicle that may be splashed with water, snowed or slushed on...

Should people use anti-seize compound between the threads and the head?

[127.0.0.1]

Originally Posted by yaris-me

Should people use anti-seize compound between the threads and the head?

there is a lot of conductive metal in most anti seize

plus there is much more metal-metal due to the
available surface area of the threads

[Yaris Hilton]

Yes, you should use it. You don't want a stuck plug.

[Rick]

Another reason for dielectric grease inside the plug boot (besides a gas and moisture tight seal) is to prevent the plug boot from becoming more or less permanently bonded over time to the spark plug insulator. It's just another little detail that separates the craftsmen from the workmen.