Service is also a highlight of the 2003 Ford Super Duty. The oil filter is on top of the engine next to the fuel filter and with the new automatic transmission filter below the engine, you don’t have to go deep for much of maintenance on the truck. The all-new air filter is still disposable, but it’s much larger to accommodate the increased air needs of this more powerful diesel and increased air volume turbo. The air filter is made of a composite material and is permanently attached to the plastic casing. So you don’t have to take a filter out of the air box, you replace the whole air box.