Most of the servicing on a diesel engine is similar to that on a petrol engine.
Fitting a new oil filter and changing the engine oil is exactly the same, as is setting the valve clearances.
Replacing the air filter can differ from a petrol engine depending on the design of filter fitted.
The main difference lies in servicing the fuel system, particularly the fuel filter.
In many ways a diesel engine is less complicated than a petrol engine, with greater reliability ...