Spark Plugs platinum vs iridium

[1stToyota]

That's funny because some new ignition wire sets come with the dielectric grease already pre-applied in the boot. And almost all of them throw a pack of dielectric grease into the box. And I always thought it was designed to dissipate heat, not cause a build up of heat. A little applied to the insulator saves the knuckles, and maybe the wire, when it comes time for the next tune-up.

[127.0.0.1]

Originally Posted by 1stToyota

That's funny because some new ignition wire sets come with the dielectric grease already pre-applied in the boot. And almost all of them throw a pack of dielectric grease into the box. And I always thought it was designed to dissipate heat, not cause a build up of heat. A little applied to the insulator saves the knuckles, and maybe the wire, when it comes time for the next tune-up.

ok it depends on the type of grease. there are a hundred types.

some dielectric grease makes better contact or allows closer mating of metal to metal. in a plug boot, with some types of grease, there will be a bit less contact, and if the voltage has to squeeze through less contact surface area, it could heat up more than normal. it can also cause small arcs and burns if the voltage is great and the contact small. that is what I meant.