Where do you live and how do you drive? Your owner's manual explains which schedule you should follow depending on the conditions and the type of driving you do.
The "normal" schedule is 7500 miles. The "severe" schedule is 3500 miles. I recommend you read both the normal and severe schedules in the owner's manual and then follow whichever you feel is more appropriate.
One thing's for certain, you won't do any damage to the car by changing the oil frequently. The only thing hurt is your pocketbook.
Just make sure you don't
exceed the mileage/time limits.
Another thing to consider, though, is time. I don't put many miles on my car, thus I change the oil every 3 months since I consider Texas heat and my short trips to be severe conditions. The normal schedule assumes that you put 15k on a year and change it every 6 months. If you want to follow the normal schedule, then either change it every 6 months or 7500 miles, whichever comes first. If you want to follow severe, change it every 3 months or 3500 miles, whichever comes first.
Hope this helps.
b