By using the manufacturers servicing schedule and manufacturers recommended oil filters and parts.

Nowadays lighthouses are largely automatic and are unmanned. Though a very few remain with personnel permanently resident there is a rigorous servicing schedule for them.

You can get a cheap auto glass replacement from Safelite Auto Glass. Once on the Safelite website, you can get a quote or schedule a servicing online.

Second line servicing includes all servicing of air craft components and systems laid down in servicing instructions.

The 2.0 dCi has a chain, not a belt and it is not in the servicing schedule and shouldn't need changed. If it does it's a huge job- the engine needs to be removed to complete the job properly.