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Factory iridium plugs life span

This is a discussion on Factory iridium plugs life span within the General Help forums, part of the LSx Technical Help Section category; Hi all, I know the factory iridium plugs are supposed to have a lifespan of 100k miles, but how long ...

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    Senior Member Whamhammer's Avatar
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    Factory iridium plugs life span

    Hi all,

    I know the factory iridium plugs are supposed to have a lifespan of 100k miles, but how long are they at thier best efficiency? I've had mine in my car since September 2009 and driven about 50k on them. With the age if them, I am not opposed to changing them, but I dont want to waste money, time, and effort if it wont help.

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    Spaz is My Mentor SMWS6TA's Avatar
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    It really depends on several factors: Gas type, driving habits, duration of drives.

    For me I start checking them around 70,000.

    On my DD they needed to be change around then, on my sons car his needed them around 90,000 miles.


    On the bird...never use them. I'm running a NGK TR6 now, the TR5's were too hot.
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    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, Monster Stg 4 Clutch, QT SFI BH, MWC DSL, UMI: SFC, PHB, LCA's, LCA Relocation Brackets & TA, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

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    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    It really depends on several factors: Gas type, driving habits, duration of drives.

    For me I start checking them around 70,000.

    On my DD they needed to be change around then, on my sons car his needed them around 90,000 miles.


    On the bird...never use them. I'm running a NGK TR6 now, the TR5's were too hot.
    I use Shell/Mobil/Sunoco premium for a 35 mile trip up and down 95 to Baltimore during rush hour,and occasionally do an Italian Tune-up. About an hours each way. I guess I should pull #1 now

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    I ran our Suburban spark plugs just north of 80,000 miles and they still looked to be in great shape.

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