Does anyone know if the NGK Ruthenium HX fits a 2015 xkr? LKR7BHX #94705 (heat range 7 and recommended for supercharged engines)

same specs as OE recommended NKG ILKAR7C10.

 

Just out of curiosity what the real world advantage of using Ruthenium plugs compared to the stock Iridium plugs?

 

NGK Ruthenium HX spark plugs offer superior performance and longevity compared to Iridium plugs, especially in modern, high-demand engines, due to their advanced material properties and specialized tip designs. While Iridium plugs provide a great balance of cost and performance for a broad range of vehicles, the premium price of Ruthenium plugs is justified for supercharged engines, direct injection systems, and high-compression performance cars where their greater heat and erosion resistance leads to more complete fuel burn, quicker throttle response, smoother running and longer service life.

 

Not trying to be critical, but without solid facts and data, it sounds more like marketing spin than something proven.

 

The recommended service interval by Jaguar for standard Iridium plugs is 10 years or 100k miles

seems pretty good to me.
when I changed mine after 10 years and 50k the originals were near on perfect with no obvious deterioration

I would imagine that most XK owners just pootle around a lot of the time and give it a blast when we can

 

i’m sure that it is general consensus that NGK is the number one spark plug brand in the world and I doubt that they would lie about something like that because that would be false advertising. I’m sure that they have testing that has been done when that spark plug was developed, including conductivity of the metal, etc.

 

:-) I'm sure.

But to answer your question: https://www.ngk.com/finding-and-comp...specifications