I change the oil in my car about once a year and I use the cheapest stuff that I can find. Years ago, auto manufacturers came out and said changing oil every 3,000-5,000 miles is a waste of money and not necessary.
I change mine about every few months. I do not go by the mileage because it varies. I do not have a certain type I use, I just use the cheap stuff I find at my local grocery store, lol.