Does anyone know when the automatic transmission fluid (ATF) should be changed for the tiptronic box (2.0 FSI)? I know DSG and multitronic ATF should be changed every four years / 40k miles, but there's no reference made to tiptronic in the service booklet or manual. The local Audi dealer thinks its sealed for life but aren't sure - they said they'd get back to me but not heard anything yet. Not meaning to open up an old debate about whether Audi's suggested service intervals are correct, but I can't believe ATF can be sealed for life?