Here is a brief list of
change/replace issues for C5 petrol models, in km.
There are all kinds of check this and that things which are not included here
20k km
Engine oil and oil filter
40k km (or 2 years)
Coolant
Brake fluid
Pollen filter
60k km (or 4 years)
Air filter
Spark plugs
80k km (or 6 years)
Drive belt (and water pump)
My comments: I'd change oil & filter every 10k and pollen filter max. every 20k
