Just wanted to pass this along in case anyone of you buy the cheaper spark plugs online from places like ebay or amazon. There is an Australian report that says based on their testing as much as 60% of the spark plugs sold online are cheap fakes. In the video attached, the spark plugs shown are fake based on a conversation with NGK USA.
https://autoweek.com/article/diy/beware-next-bargain-spark-plugs-you-buy-online-might-be-fakes
https://autoweek.com/article/diy/beware-next-bargain-spark-plugs-you-buy-online-might-be-fakes