You can change the oil yourself or at any facillity you choose, the oil must be within factory spec.
Use any filter you desire, ac delco is a good choice
You can also rotate your own tires and there is a map on doing so in your manual.
be sure and only use the pink engine coolant (dextron 3) the car came with, it does not mix with the green (glychol) and can cause terrible problems if you do.
you can also get your brakes and muffler done at any shop you desire without voiding warrenty.