The Motorcraft SP 523 Spark Plug is an essential automotive accessory that I have recently added to my collection. As my tests showed, this spark plug is highly efficient and produces a smooth ignition resulting in superior engine performance. The design is sleek, and the installation was straightforward, making it ideal for DIY enthusiasts. However, the only drawback was the slightly higher price range .Overall, I highly recommend this spark plug for anyone looking for a reliable and efficient See full review