When you pick up your rental car from Oscar in Aarhus Ø, a member of staff will go through the vehicle with you. This includes a joint inspection of the car's condition, fuel level, and any pre-existing damage. The walkthrough is in your interest - it ensures there is no uncertainty about the vehicle's condition, either at the start or end of the rental period.
The same principles apply at return. The car is brought back to the same location, and staff will inspect the vehicle again. It is recommended to return the car with the same fuel level as at pickup, unless otherwise agreed. If you have any questions during the rental period, you can always contact Oscar directly.
Bring a valid driving licence and the payment method you provided at booking. Allow a little extra time at pickup so the inspection can take place without any rush - especially if you have a tight schedule planned afterwards.