Review on Motorcraft - High Performance Spark Plug (SP550) by Mike Weaver

I replaced the spark plugs in my 2018 Ford Fusion EcoBoost 2.0L Turbo with these. FoMoCo's previous part number was SP-537. Regardless of what Revain Garage may tell you, these SP-550s are what you need. Ford has changed the part designation. At 40,000 the car started to respond slowly and backfire when I hit the gas pedal to overtake (or just accelerate!). I even have the horribly blinking engine icon telling you raw fuel is being dumped into the exhaust system and catalytic converter. and that's a bad situation! Ford recommends changing every 100,000 miles, but from now on I'll spend $25 and change them every 20,000-30,000 because the 2.0-liter EcoBoost kicks the crap out of the plugs even down to 100,000 (see photo) at Use of high quality fuels. They were relatively easy to install. It took longer to remove the intake duct than anything else. If you go to YouTube and watch a few videos and are generally mechanically inclined, you'll be fine. If your car has 100,000 or more, replace the coil packs while you're there. This is even easier as you still have to remove them to swap the plugs.