I used these during a 2014 Kia Forte 100K service interval and noticed an immediate improvement in gas mileage and throttle response. NGK says their threads use a trivalent metal that doesn't require an anti-seize compound and acts as a release agent. The OEM spark plugs in my car were NGK and came out with no problems and clean threads so I'm sure. All the plugs had the same gap and the threaded end had a protective cardboard cylinder to protect the electrodes during transport.
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