Review on Genuine SP580 Iridium Spark Plugs by Doug Hawkins

Genuine Motorcraft Spark Plugs at half the retail price. My 2014 F150 3.5 Ecoboost has done 60,000 miles with the original spark plugs and cold starts were slower and harsher. These forced induction engines place heavy demands on spark plugs and after some research they should be replaced about every 20,000 miles as a measure of good maintenance. .028 clearance when tuned to most tuning company recommendations, .030-.036 headroom to Ford factory specs. I used a wire loop spark plug tool to test all 6 before installing (0.032 +/-). My truck is detuned and I have decided to decrease the gap to 0.030 as the Ecoboost motor is known to open up spark gaps between changes. Installation wise, the Ecoboost on the F150 is one of the easiest spark plug installs I've ever done. Slowly apply a small amount of Nickel Anti-Seize to each and replace all 6 spark plug boots just to be on the safe side (Motorcraft part number WR6125). The job should take no more than 30 minutes. The truck now starts much faster, idles smoother and has excellent overall performance after a spark plug change.