I have a similar issue with my car...
I always like to change the oil (and filter) in my new cars at 1000 - 1500 miles. I use Mobile1. With my new G8 (V-6) I'm actually thinking of changing the Oil/Filter @500 miles because the car was originally delivered to the dealer a little over 1 year ago and it had 160 miles at delivery. ~100 of those miles were dealer to dealer moving but the original oil is over a year old. "They" always say (for oil change intervals) 3000 miles or 6 months which ever comes first, so I'm thinking time is more of a factor then milage in my case.