I think it is 60,000
But play safe contact Citroen or a local Citroen dealer/agent
www.Citroen.co.uk
click owner services
click on contact down bottom of next page that shows.
Good job I read your question as I have a Peugeot haven't checked my book it now at 31,000 The 60,000 rule seems to be the norm but it pays to check.
Bob, March 2009