When driving a semi truck cross-country and trying to meet all your delivery deadlines, you should carry some extra items with you. That way, if you have issues in the middle of nowhere and are miles from the closest town, you can sometimes take care of the problem yourself.

Modern diesel trucks are cleaner and more efficient than ever before. But that cleaner performance doesn’t just happen inside the engine — it’s largely due to the exhaust aftertreatment system working behind the scenes, including the DPF (Diesel Particulate Filter) and DEF (Diesel Exhaust Fluid) systems.