2018 GT Spark Plugs "Wore Out" After 900 Autocross Runs and 40k Miles

[TeeLew]

I throw plugs in the Eco about every 10k, lol. They're a little more sensitive to spark, but it makes a noticeable difference at high boost & rpm.

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[Gfswindle]

Check out the crater in the ground strap on an 86k hwy miles 19. I changed these out last weekend. Remember the oem Ford plugs have an iridium center electrode but the ground strap is not iridium and subject to wear as standard copper plugs are.