Thierry
my car came with 3 dipsticks from the PO!
In order to insure that the correct one is in use, I drained the oil out of the engine and oil cooler and replaced the filter.
After filling the specified amount of 6.0 l I ran the engine for about 5 minutes, turned it off and waited for another 5 minutes then checked the dipstick.
It should be fairly below the upper level.
Sure enough, mine was incorrect but fortunately one of the 3 was correct.
Urban