I have always used synthetics, after about 2000 miles I switched over to Pennzoil Platiunum. You will see an increase. You do not need to wait till 10,000 miles, you can do it immediatly, but I waited a few miles just because it made me feel better to do so. The logic is seating the rings with regular oil. But it will not take that long to seat the rings.
I have used mobil 1 in the past. But with the price of pennzoil synthetic being lower, and I have read great results from used oil annls I made the switch to pennz. to tryi it out.