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I'm using NGK iridium IX in my car... I bought a 2008 aveo with 34k miles on it... its stock coppers were horrendusly roasted... the iridium IX gave a notable improvement.
Note, most of the improvement was just "new plug" and not iridium
the NGK IX is rated for 60 thousand miles, and is a low voltage plug... that means its better for cold winter starts (which I need in chicago)
Once the engine is warm... if the plug burnt to hell... it doesn't make a difference
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