I change the oil and filter every 3000 miles on the Cavalier with 206,000 miles and the Silverado that now has 4,700 mikes. The Silverado got a change at 500 miles and again at 2000 miles, It will probably get changed again in February at about 5,000 miles.
The old Toyota truck with 300,300 miles will only see about 2,500 miles, or even less, a year now so it gets changed every 6 months.
I use Mobil 1 15W-50 and Wix filters.