Using this oil cap cover is a breeze. First, take off your original oil cap from your 2003 - 2018 Dodge Ram with a 5.9L or 6.7L Cummins engine. Then, simply press the original cap into the recessed cavity of the Fleece cap. That's it! It'll stay firmly in place. As for maintenance, just clean it with a mild soap and water solution from time to time to keep it looking shiny. Avoid using harsh chemicals that could damage the anodized finish or the laser - etched logo. When you're driving, there's no special care needed, but if you notice any looseness, check to make sure the original cap is still well - seated in the Fleece cap.