Had my 8V A3 TDI Saloon since mid October 2016 (bought new at the time) and it had its first oil change at 10,000 miles in February and now I'm up to almost 25,000 miles and the dash is counting down to another oil change (at 25,000 miles). However, when I got it serviced in February they told me that I'm good for another 20,000 miles so perhaps they re-configured the interval slightly incorrectly? What is the usual mileage for your 2nd oil change/service?