I just purchased a 2017 q50 2.0 from an Audi dealership where the precious owner drove it only 6,500 miles in 3 years. Looking at the carfax, it shows she drove the car 5,200 miles in a span of 2.5 years without changing her oil, which i’m assuming was synthetic. Should I be worried?

Can anyone suggest at how many miles I should do my first oil change? At how many miles did you do your first oil change?