Standard Copper Core or iridium

[RickSkye]

Unless someone comes up with evidence to the contrary, its good old copper for me.

[kiriakost]

I am the evidence .

The fuel economy comes from the part , that the iridium improves the burning , less gasoline pass as unused from the cylinder .

The horse power , does not improve much .... and they last about 20.000 Km

I had to replace the standard NGK every year .

With the NGK Iridium , I had made 6000Km in two years , and still goes strong.