[Dyno]

I'm an older guy, so I remember when you needed to do a "tune-up" fairly frequently. Spark plugs have come a long way since then, mostly as a result of the gub'ment's mandated 100,000 mile emissions warranty. If spark plugs go bad within that mileage, the engine will likely start misfiring and setting codes. The OEM must report such emissions-related failures, and the fines are huge if it gets out of hand.

Hence, we have double-platinum spark plugs and well-tuned air/fuel ratios that allow plugs to live happily for 100,000+ miles. Thank Washington for that, not Volvo or Bosch.

Two mistakes that I've made and that you should avoid...
1. Putting never-sieze on plug threads
2. Going with an auto parts store "equivalent" replacement for the factory plugs