My daughter has a 2003/53 Citroen C8 with 55,000 miles. The cambelt snapped with resultant engine damage. The handbook advises cambelt change at 100,000 miles or 10 yrs. The car was inspected at the Citroen main dealer who diagnosed a leaking water pump, stating that the coolant had leaked onto the belt and caused it to deteriorate and snap. Is this, in your experience, the case? Also it is impossible to see the water pump and is not in the service list of things to check. Your comments would be much appreciated