what year of diesel truck? changes in trucks every year.
i have a 2006 chevy and have walmart change the oil when my sensor tells me to. some of the older trucks don't have a sensor.
same with fuel filter; when the sensor tells me too. I can change that myself, many service places seem not to be interested in changing a filter on a diesel..oh well. and, i've never drained the filter for water, which in my chevy is somewhat of a pain.
that's the "maintenace" you typically deal with.
that's about it....truck runs and runs and runs.