Thanks Kiki1, - I am aware that oil leakage into the clutch compartment will cause slip, however it was not the case the first time at 15000 miles, and the failure according to Citroen U.K. was stated as the clutch being subject to wear????? after 15000 miles of careful driving?
Now after a similar mileage the new replacement clutch is slipping in the same manner as before - when cliumbing an incline, or proceeding to overtake in 4th or 5th gear and approaching 2000 rpm - I do not and have never driven it in excess of 3000 rpm.
It never slips from moving off from start or in the lower gears,or below 2000 rpm which would eliminate oil leakage, but only seems to be when in a situation of maximum Torque.
As I know it will slip under this condition andI drive such that I avoid this peak.
Strange, but there are other C5 owners that are experiencing the same conditions - Try putting the Title details into the google search engine!
I am still pursuing this problem with my dealer/Citroen U.K.
Thanks for your interest
Les H.