Hi,
I have information about the #4 I was very close to purchase it from an Audi dealer in a part exchange with my RC300h Fsport 2017 the fund to change,they asked me was 12.5k.
but when I looked at the service book the first service was surprisingly done in a Audi dealership with 3 months late of service date and the second service was due 4 or 5 months the Audi dealership did say the rear disc was worn out 90% so I pull out from the deal and now another dealership bought it and sell it 3.5k expensive.