If you search here, this has been discussed a few times. You will find opinions stretching from using cheap (read probably most dealer) oils to the best oils one can buy for either the maximum interval or changed at half or even one third intervals.
All are correct.
Which you decide to go with depends a little on your driving conditions and a lot on how long you want to keep the engine in best nick. If you are likely to write the car off or sell it before you do a lot of miles then you may elect to do the least to maintain the warranty - maximum intervals and dealer oil. Easy.
On the other end of the scale is someone like me. I keep my cars for a long time (15+ years maybe) so I use good oil and I also decided to do intermediate changes as well. I'm a capable mechanic (not that it requires any skill at all) and I do my own half-interval oils changes.
I take my oil of choice to the dealer for the major services and he discounts me his charge for oil. The difference between his normal charge for oil and my top-shelf oil I buy myself is surprisingly little.
Form your own a maintenance strategy based on all the information you get but as I've said before: you won't get into trouble for changing the oil too often.
