🚛 Let me show y’all what the DEF system looks like on a truck. This system is part of the emissions equipment and it uses Diesel Exhaust Fluid (DEF) to reduce emissions. If something in this system fails, the truck can derate or even shut down completely until it’s fixed. 💀 That’s why truck owners need to understand what these parts look like and where they are before something goes wrong on the road. A lot of people buy trucks and have no idea what they’re even looking at under the hood. #tru