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|The Following User Says Thank You to PhatRoyale For This Useful Post:|
Denso I series Iridium Power (the 0.4mm style ones) have a much shorter change interval.
What change interval you use will depend on what type of plugs you have.
Toyota recommends 120k miles for all stock iridium plugs (SK16R11 for the 1ZZ-FE). If you are using SK16R11, I don't see any need to change them early.
If you are using Denso IK16's or IK20's or similar, then change them at Denso's 30k mile recommendation.
What type of iridium plugs are you running Mithridates?
2011 Lexus IS350 6MT F-Sport with LSD
1986 Toyota Corolla GT-S Supercharged with TRD Stuff
1993 Toyota Previa 5MT Studded Ice Race Van
|The Following User Says Thank You to Jeff Lange For This Useful Post:|
Best not to guess - just pull the plugs and read the end. On my car - 90K-100K was all I was able to get before significant wear on the plugs started to affect performance.
2002 Toyota Corolla S
2003 Toyota Matrix XRS (RIP)
2009 Toyota Matrix XRS
2009 Toyota RAV4 Limited AWD
2016 Toyota RAV4 XLE AWD
|The Following User Says Thank You to fishexpo101 For This Useful Post:|
As cheap as spark plugs are and as easy it is to do, is it really worth it to wait for 100K?
Beyond that, in normal compression, NA motors I never use iridium plugs. I haven't noticed a difference and they're a waste of money, especially when I keep up maintenance as I do. They have a place and are useful, just not in average motor applications.