How long do NGK irridiums last?

[Mark300zx]

I think my set are coming up to 20k now, and I read varying reports on google!

 

[BoostHard]

What Iridium plugs do you have?

Iridium IX 40-50k according to their website,
Laser Iridium plugs are 80-100k,

 

[Mark300zx]

Ngk bkr7e ix

 

[BoostHard]

so 40-50k then if they are the IX series although I guess that depends how healthy the engine is on a whole.

 

[Mark300zx]

Thanks