Review on High Performance OEM Replacement Platinum Spark Plug (Pack of 8) by Paul Llena

As a hesitant buyer, I purchased these ignition parts for my car, hoping to improve its performance, but unfortunately, the Motorcraft SP509 Spark Plug Pack didn't meet my expectations. As a result of my tests, I determined that the spark plugs failed to deliver the necessary combustion for my engine, leading to decreased power and fuel efficiency. The only pro was the easy installation process, but that hardly compensates for the overall lackluster performance. Stay away from these spark plugs if you want to keep your car running smoothly.