What interval I should change my Irridium plugs? when used in S/C s2k?

I have NGK Irridium installed with SC and it has been almost 10,000 mile since.
Maybe time for change?
(I'm getting little worried after I seeing many failure of Denso Irridiums)

TIA

 

The whole idea with using Iridium plugs is that they should last the life of the car. The fact that we've had a rash of recent failures comes as a surprise to all of us. There is no evidence to tell you when you should change them as till now, they never needed changing.
These failures were with Denso, so if you are using NGK, unless there is evidence of failure, again, they should last the life of the car. However, if you were a gambling man, you might want to reconsider using Iridium plugs regardless of brand, but the choice is yours.
On a NA car, it's no big deal, but with a F.I. car, is it worth that gamble?

 

You don't have to gamble with the NGK copper racing plugs. You just have to change them every 3k miles.

 

I have heard this with the copper plugs over and over again. What makes the copper plugs have such a short life? I really need to stock up on them if I'm going to change them with every oil change.

 

Copper is soft but a good conductor of electricity. It doesn't stand up well to intense heat and sloughs off. It can also form other compounds during combustion that will stay on it as deposits. In NA applications, the lifespan is not nearly so bad as when used in F.I.
Platinum is much harder and can resist these events but is a lesser conductor. Iridium is also harder but has better conductivity. It tries to be a compromise between copper and platinum.

 

sorry if this is a stupid question, but which plugs will last the longest with FI? which ones don't need to be changed frequently? I'm currently running my stock plugs so should I check on them frequently?

THanks

 

I would get those out of there if I was you. The iridiums are the ones that until recently (like xviper said) you never had to change. I would still go with those if I were you. I don't know the part number off the top of my head but there is a bunch of threads about it.

 

thanks

 

It always a good idea with F.I. to check plugs every few thousand miles anyway. "Reading" plugs is one way to tell how things have been running. To leave a "lifetime" plug in a F.I. engine and never give it another thought may be sheer folly. Pulling plugs and looking at them is one of the simplest things for an owner of such a car to do. Could save you mucho dinaros. But then, you have to know what they're supposed to look like.

 

should I do a search on how to remove them and what they should look like OR will you be kind enough to post your inspiring thoughts here