I've run Havoline 10w30 for the last 100,000 miles and no problems at all. I used synthetic up until about I reached 90,000 miles. So I guess, I've been on nomral oil for the last 53,000 miles.
Some swear by synthetic continuously, but I've had no issues. My engine hasn't been cracked open yet and it still runs very strong. If you change your oil and oil filter regularly, like every 3,000 miles, you'll be fine. Good name brands are Havoline, Mobil1, Penzoil, Valvoline, and a few others.
I've stuck with Havoline for oil, oil filter, coolant, and tranny fluid. As long as things are clean and serviced regularly, you'll be in good shape for a long time.