These have been installed for 45k miles with no sign of a problem. I will change the plugs at 50k - just because I think it is a good idea.
I will use the same kind of plugs again, if they are still out there, since the last set was so good.
Regards,
Darden
Update: Replaced my Taylor wires after 160,000 miles and they were used up. I suggest replacement at 150,000. Definitely got my money's worth out of these wires. Highly recommended. Replaced them with another set of Taylors.
Never a bad idea to change out wear items like plugs and wires. Iridium plugs generally have a life span of 100,000 miles. I changed the iridium plugs in our Suburban at 90,000 miles and they showed no visible wear.
I believe the Iridium plugs are good for 100k. Took mine out at 50k. No sign of wear.
I will replace them at 100k and put the old set back in for the other 50k they should be good for!