I found a very thorough answer to this on Edmunds.com, check the 'related links' below. This is what it says:
Electric-/hydraulic convertible top pertains to a closed hydraulic system. As a rule, a filling is only required after opening hydraulic circuit (e.g. after replacing parts).
Remove CD player if installed.
Remove screws of left luggage compartment trim and remove trim.
To fill, convertible top must be opened, actual oil level can only be determined when in an opened state.
Remove oil filler plug.
Oil for convertible top hydraulics: G002 000.
Top off hydraulic oil only until oil level is between "Min" and "Max" marking.
Use a fill container for filling hydraulic oil.
Fill container must only be used exclusively for this purpose in order to prevent hydraulic oil impurities by other oils.
Screw oil filler plug tightly (5 Nm ).
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