Iridium or Ruthenium plug to replace a copper plug in performance LS

[nthach]

I'd pay close attention to the ground and center tip materials for each specific model. There are "Laser Platinum" plugs that have a nickel ground tip and a claimed lifespan of only 40k miles compared to 90k miles for proper double platinum tips. Very confusing when they are specified for the same application and the "superior" double platinum plug costs less...

Eg:
Laser Platinum w/ nickel ground, 40k mile life: https://www.ngk.com/product.aspx?zpid=30699

Laser Platinum w/ platinum center and ground, 90k mile life: https://www.ngk.com/ngk-5987-plzfr6a-11s-laser-platinum-spark-plug

Yep, the Denso plugs on almost all the Toyota 2GR-FSE/FXS/FKS, as well as the smaller variant in the Lexus IS250(4GR-FSE IIRC) and 1UR-FSE/2UR-GSE/2UR-FSE only have Pt on the center ground strap and not the side straps. 60K life. It’s done so if the main strap is carbon fouled, a spark can still happen.

 

[BrendanC]

Denso twin tip plugs in both my truck and the accord.