Over here in Germany changing your oil every 3k miles in a normal A4 absolutely tanks your resale value. The only reason to do this frequent oil changes is to hide problems. Personally my car did 30 000km(~20k miles) until 91 000km and then every 15 000km(~10k miles). It's a diesel and almost all longish distance highway trips.
Pros: long intervals, good for diesel
Cons: low resale value
Vehicle:
Audi A4
Mileage: 30000 km
