u/xampl9

This was asked in the Lexus sub:

https://www.reddit.com/r/Lexus/s/41mTaeRnzr

Lexus apparently recommends 60k or 6 years. The owner is nowhere near the mileage but is over the age.

I don’t understand why age matters on a plug. If it’s not being driven, the electrodes aren’t being worn down.

Is there a cement or glue between the ceramic and metal that dries out?