so you see that nissan 'recommend' that they're changed but you ask if its 'recommended'
i assume you take your car for servicing at the recommended intervals but you wouldn't ask if its worth replacing the oil as theres nothing wrong with the existing oil and you won't see any gains from having the oil and filters done, so why would you question changing the plugs at the correct interval
as for every 100000 miles not sure where you got that from :smile: