What's the difference? The NGK site does not say much. The IX has a thinner tip. So I suppose it fires better under lower voltage but wears out quicker than the standard Iridium?
I believe this is exactly true. The IX is for replacing standard (easy to change plugs) with Iridium plugs. The NGK Iridium is made more for long life (60k miles).quote:
So I suppose it fires better under lower voltage but wears out quicker than the standard Iridium?