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How Long Do Iridium Plugs Last?

September 30, 2012

A traditional IX iridium plug such as NGK ZFR6FIX-11 has an iridium center electrode, however the ground electrode is a traditional nickel construction.  Therefore, the ground electrode will wear out first. NGK gives them a life expectancy of 40-50k miles.  But they have to temper their projections as driving conditions and motor modifications differ.  Typically we have found you can expect 60,000 to 80,000 miles on an unaltered motor.



NGK Laser Iridium plugs have iridium center and a platinum ground electrodes. If installed in a regular engine, they would likely last longer than most people keep their car (barring any motor problems that can cause premature plug death).  All Laser Iridium plugs are an OEM design, made for a specific engine.  Some feature a special resistor or electrode design, depending on the OE requirements.  In their OE application, NGK's Laser Iridium plugs typically last 80-100k miles.


l. overbes

Feb. 9, 2017
My car is a 2007 Pontiac Gr Prix and it has about 90000 miles and it seems to run great I don't expect to change the plugs for a least another 15000 miles

Carl Fenski

Dec. 8, 2016
238000 miles on a Pontiac Vibe (Toyota Matrix) with original plugs. Just starting to notice a drop in MPG. Replacing with another set of NGK


Apr. 30, 2016
2009 Nissan Titan I Bought new at Dealer , now is 243K Original miles ,Genuine Spark Plugs GNK PART NO 22401-ZEO1B Original Spark Plugs still work but is time to Replace, Good Brand.NGK DILFR5A11.

Andrew Fabian

Feb. 12, 2015
We were running upto 20 lpg vehicles and finding standard plugs and some more special ones were lasting 5 to 10 thousand miles and suffering misfires, my search ended with iridium plugs and as yet had no misfires , also I decided to change a set on a jeep Cherokee because of electrode wear after 138 thousand miles, this is the first set I've changed, as you can imagine I am soo impressed 😄 NB this has been at least a ten year excersise 😄


Jan. 3, 2015
Best plugs you can get. However, don't take the mileage frequencies for granted. I just had one of the laser iridium plugs fall apart (ground, node, and some of the ceramic casing) and go flying into my 3rd cylinder chamber causing a misfire and a lot of worry @70k miles on them. Be safe and not sorry and replace them every 50k miles if you drive a vehicle meant for performance, even if it is OEM and not tuned.
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