How to maintain the engine of a Ford Transit Custom?

My Ford Transit Custom's engine is starting to sound a little rough and I'm worried it might be in need of maintenance. What steps should I take to keep the engine running smoothly?

Regularly check and change the oil, as well as all other fluids such as coolant and brake fluid. This will ensure that your engine is properly lubricated and running at its best.

In addition to regular fluid changes, make sure to replace any worn out belts and hoses. These can cause serious damage if they break while driving.