Expected lifespan on COP plugs?

[davidon]

Just trying to get an idea on this

 

[RaWarrior]

COPs have been around for a while in automobiles, and there is no scheduled replacement interval for them in the maintenance charts, whereas wires were every 100k miles or so. They seem to be pretty hardy. Ideally they last the life of the engine.

Not saying they never go bad, but not something you'd really have to worry about.