Sorry didn't motice the 6 speed auto bit...Ooops - check fluid level - again mileage / service history. Is it the same hot or cold - the engine / transmission - not the atmosphere. Sounds like luxury to have 6 speed auto but maybe 1 1/2 times the probles of a four speed ?
As far as I am aware there's no workpoo manual available for this model ?? - If it's anything like that for the Mk IV then you are not missing much.
Transfer the question to the GV 5 forum and see what happens