oil change on 1999 Cadillac Seville STS

when should I have my oil change how often

Asked by for the 1999 Cadillac Seville STS
Change the Engine Oil and Filter between 3,000 miles ( 5,000 Km) and 7,500 miles (12,500 Km).
Engine oil with filter capacity is 7.5 quarts (7.1 L) SAE 10W-30.
Engine Oil Filter recommended by the manufacturer is AC Type PF-58.