Spark Plug Replacement, 2018 TRD Off Road Premium

My 2018 TRD Off Road Premium is due for 80K maintenance and the dealership recommends replacing spark plugs. Toyota manual says replace plugs at 120K.

I do mostly highway, city driving. (However, when I need off road capability I need it, hence the TRD Off Road.) No dusty dirt roads, no towing.

Any benefit to replacing plugs now--i.e. engine performance, mpg? Not cheap and not something I want to try myself.

Planning to keep this 4Runner for years to come.

Appreciate answers based on your expertise/experience, esp. any mechanics among you.

Thanks.

 

Totally fine to change them at 120k.

I just did mine at 120k and they had normal wear.

I don't see any benefit to doing them at 80k.

 

About to do my plugs at 80k with an OEM pcv valve, clean throttle body and MAF sensor. I don’t disagree that’s early but I have OCD for maintenance. Plus it’s like $70 in parts. I’ll drain and fill the coolant as well.

 

If they’re iridium plugs, then 120k miles should be no problem.

 

Save yourself $300 and do it yourself. Plenty of YouTube videos out there to guide you. Get the factory Denso Iridiums. You can do it!