Replace spark plugs every 4 years

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Originally Posted by bowlofturtle

This dealership in GA notes state spark plugs should be replaced every 4 years.

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Thoughts on this?


My thought? Follow the money.
 
I've read that Hyundai/Kia calls for short plug change intervals (45k miles on iridium) in their turbo engines because of concern that the center ceramic insulator can shatter and cause engine damage.
Electrode wear is apparently not the issue.
 
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