Facts about the car:
- 16 years old VW with 280kkm/170k miles on the odometer
- I plan on driving it until it dies
- 2.0 TDI motor and a DQ 250 02E, wet-clutch, six-speed original DSG transmission
- no access to service records
- dual mass flywheel changed in 2016, unsure about transmission work
- don't know if DSG fluid was changed previously
- previous owner was organized so probably yes, but can't contact them to ask
- transmission feels fine, though sluggish at times (i.e. shifts later/at higher revs than I'd expect it to, even though I'm in D, not S), and there are no clunks, weird noises, or jolts when shifting.
The question: I want to maintain it so it lasts as long as it can. Am I fine to change DSG fluid now, or do I risk messing it up if it wasn't changed and is now worn out? I know that's a risk in traditional torque converter based automatics, but DSGs are different.
Since it has wet clutches, maybe contaminants in the fluid are providing extra friction to the worn clutches?