I want to know, how can you tell when it is time to replace the new Iridium spark plugs?

I have a 2004 Dodge stratus R/T, basically a mitsubishi eclipse. I have never been exposed to these spark plugs,I want to know, how can you tell when it is time to replace the new Iridium spark plugs?Check the owner's manual for the vehicle in the maintenance section to be sure, but most iridium spark plugs have a 100,000 mile service interval. Do not confuse iridium plugs with platinum ones...platinum plugs do not resist carbon build-up as well and will need to be changed more often. As for the dual and quad tipped plugs by Bosch...these are platinum and only have a tiny amount on the ground electrodes...none on the firing electrode.



The best choice for this engine would be NGK or Denso iridium plugs...usually around $10 each from the aftermarket parts stores.I want to know, how can you tell when it is time to replace the new Iridium spark plugs?BY REPLACING ITI want to know, how can you tell when it is time to replace the new Iridium spark plugs?When your car no longer starts. Also, remove the wire from them to check for corrosion on both the wire and spark plugs. If there is a lot of corrosion on either of them, then it is time for replacement. I've found the best spark plugs to be either Bosch platinum or Autolite platinum. Some have dual spark for increased horsepower.I want to know, how can you tell when it is time to replace the new Iridium spark plugs?That is dependant on the application and condition of the engine. High revving engines, driven hard, (eg motorcycles) will wear plugs much more quickly than a large engined car which is used for cruising. Standard copper plugs usually have an estimated service life of 10,000 to 20,000 miles depending upon design and application, Denso recommend changing their Iridium Power plugs before the maximum 30,000 miles, NGK's Iridium IX may last up to 60,000 miles in a standard use car engine. Double platinum types may last 60,000 miles or more and some NGK and Denso OEM Iridium types may last up to 120,000 miles. The plugs optimum performance level is passed a long time before these intervals so we would recommend changing plugs regularly as a matter of course. An engine, ignition or carburation/injection fault or poor adjustment may cause premature wear and/or failure. Tuned engines, engines driven hard, poor quality fuel amongst other factors can all dramatically reduce service life.