Hi,
Check when the timinig belt was last changed if you have no record then this must be changed now.
Citroen Diesels engines seem to perform at there best when the Engine Oil and filter is renewed every 5k miles.
Theres still lots to talk about when a car gets to 60k if you havn't already buy yourself an Haynes manual and run through the service intervels in the front of the book any thing that hasn't been done,then thats your start.
Hope this helps any other advice then keep on a posting.
Life feels good just as you complete No4 Glow Plug on a ZX-TD