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When to replace spark plugs 2000 Corolla

My 2000 Corolla has 60k miles and I was wondering when I should replace the spark plugs. The manual doesn't indicate when it should be done but it says I should use Iridium Denso SK16R11 or NGK IFR5A11. Thanks for the help, WV

Reply to
Wayne
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The iridium plugs last for atleast 100k - 120k miles.

Toyota MDT in MO

Reply to
Comboverfish

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