Spark Plugs

Has anybody installed E3 plugs in their engines? I did and I immediately saw a small positive difference plus gas mileage improved a little bit. My car is a '14 GT.

Found similar results with new Motorcraft plugs...
What part# E3's did you use?

I did but car was uncontrollable after install, couldn't get car to hook. Switched back to ngk to tame the yote down.

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I put E3's in my daily beater Toyota Echo about 6 years ago. One plug failed a few years ago and replaced it in hopes that it's just a fluke. Just a couple years later now, I have 2 failed. That's more than 50% failure rate under very easy conditions. I won't be putting them in the coyote.