If you really want to do yourself a favor, you'll be sure that you engine is fully broken-in before switching to full synthetic oil.
I wanted to know when the rings had completely seated in my new V8 4Runner. So, at just under 200 miles (that's right, two hundred miles) I did a leak down test and it passed. The engine was broken in. I changed the oil to synthetic, but I drove my break in schedule until two thousand miles, just to be sure. After all, it's my vehicle. I wanted that original oil and any assembly stuff and particles out. Today's motors are built so well that driving easy for 2k miles, like I did, varing the speed and never driving at constand speeds on the freeway, gradually speeding up to 70mph and gradually slowing down and doing it all over again, may not be necessary. I did it, and would do it again, and it made me feel better for doing it.
And here's a thought about that first oil change. If you do a uoa and find anything other than standard oil, your finding assembly lube. Here's another thought. You have been told things like change your oil every 5k miles or six months. When your engine is manufacturered, there might a delay of a few days, weeks or months until it gets installed in your car. Then there might be a delay of some months until the your car gets shipped, trucked and delivered to the dealership. Again there might be a delay until you buy the car. And the driving your car gets, waiting for you, short run, never warmed up and maybe driven by a salesperson or shopper in a way you never would, that is, foot to the floor on a dead cold engine, then as soon as it starts to warm up, park it, waiting for the next test drive. This could be called severe service. And this could be happening to a vehicle that is older than 6 months. Your car could, technically be overdue for an oil change the day you drive it home. If you count your car's age from the delivery date you might want to reconsider. I do software for fleet maintenance and for the year 2004, seventeen percent of the new fleet purchases where vehicles with a build date that indicated they were over a year old on the first day of service. Tracking the engine back would age the vehicle a little more.
Engines don't have break-in oil. At least change the oil, using conventional oil, as soon as you drive home. If you are going to use synthetic, wait about 2k miles. If you trade vehicles every couple of years, forget the whole thing.