I changed the DSG fluid and filter in mine at 40k miles per manual. I bought a kit off Amazon from a VW dealer for around $130 or so. I did the work myself with the help of a mechanic friend (has a full garage with lift at his house) and it wasn't bad. If you take it to a dealer you'll probably pay around $350, DIY and you'll save a couple hundred. I always recommend people use the fluid from VW/Audi, but there are online sources that I trust as well for different brands (Motul, Liqui Moly, etc.) but they can cost a little more. For me, it was worth peace of mind to go with the spec fluid from VW (75w90).