Looking to get the most out of your 6.0 Powerstroke? Make sure you're running with OE quality parts like the Mahle S41940.040 Piston Ring Set.040. This set maintains a factory performance while still giving you the power and reliability you need to take on any jobs. Plus, it contains rings for a single cylinder - so you can be sure you're getting exactly what you need. For a complete set, be sure to order qty 8. Don't settle for less than the best - go with Mahle.