I would like to second leitztech's comments. You shouldn't reset the FSS as it will effect the overall maintainance schedule. Even if you don't reset it, it will increment slightly as a result of changing the oil.
I changed the oil in my ML to Mobil 1 after the first 400 miles and will replace the oil and filter at 4K mile intervals. If you're not going to keep the car past 100K miles or so, you can go with the FSS schedule and skip using Mobil 1....
As Larry says: Change oil hot and change oil often