I brought my truck in at 1,000 miles to do an oil change, but my selling dealership didn't want to do it because they were slammed and also told me to wait until the computer said so. I said I always do a break-in oil change, and then the service advisor said, we don't even do that on the SRT or HC engined cars, that they also only come in when the computer says to do so.
It was clear to me they didn't have time and used that as an excuse to avoid doing too many cars, even though they overcharged for their oil changes at $100!
I eventually waited until 4,500 miles, when my computer was at 45%, and did it myself. If I had a chance to do it over again, I would have done my first DIY at 1,000 miles, but I got really busy and pushed it back. That being said, I think 4,500 miles isn't bad for the first oil change, assuming it's synthetic that's in there the first place.