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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.

Comments

EJS

Feb. 25, 2014
OE Ford f-150.....209k miles original plugs!

Electrician by day mechanic by night

Nov. 1, 2013
NGK makes probably the best spark plugs in the world..they last we'll into 100k miles in a normally operated engine..the only problem with all spark plugs is the performance of the spark is reduced with age..so even though your original plugs still continue to work in your vehicle with over 100k miles, the efficiency of the engine is not the same..it's a good idea to check the spark plugs every 80-100k miles

King Forouk

Jul. 5, 2013
291,000 MILES! 06 HONDA CIVIC LX 4DR. ORIGINAL PLUGS STILL RUNS GREAT!

John Austin

Apr. 10, 2013
My 2000 GMC Sierra, 4X4 with a 4.8L enging has 356,000 km (222,500 mi) and still has the OE plugs. The truck still runs great.

Kevin Armstrong

Apr. 2, 2013
Use Iridiums in a four stroke Ultralight engine, actually a hotted up Briggs and Stratton Vanguard. They cured poor running and fire up instantly, with solid reliability-just what you need in an aircraft.
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