It's about that time to change the spark plugs. As you can by title I'm trying to decide which spark plug to use. What's the difference between the two? Which one is better or is there no real difference? Thanks in advance

 

When I was looking I was told to put in what it came with that it won't run any better or any longer. Well, unless you have engine mods.

 

The Lexus OEM plugs typically have a Platinim disc welded to the ground electrode thereby increasing service life.

Certain high performance plugs have a tapered-end ground strap, which arguably results in less spark shrouding than a square-end ground strap, but neglected to incorporate the Platinum disc...which requires more frequent spark plug changes...could be as low as 30K vs 100K for OEM.
However, NGK # DFH6B-11A Laser Iridium spark plugs feature an iridium disc welded on the center copper electrode and a platinum disc welded on the ground electrode, reducing the wear rate of both surfaces offering durability and long service life.
Correct 14mm thread size, 26.5mm reach and heat range (Denso 6 = NGK 11)

Expen$ive.

Denso apparently offers a similar # FK20HBR11...however, less expensive so perhaps readership has input.

The attached NGK images depict 2 additional ground straps...

I believe this configuration is used on later model LS460's...so the OEM is apparently OK with it.




Tri-electrode NGK