I wish to have my DSG fluid change. The dealer has said that its a later version box - 7 speeddry clutch - sealed for life, as apposed to a wey clutch. My personal opinion is sealed for life = later in life gear box rebuild. My local VW independent also said "its sealed fro life sir". Question should I have it changed or not;and, can it be changed. is it tru that this DSG fitted on the mark 7 only hold 1.7 litres of fluid?