Where is the oil filter located on a 1997 Cadillac SLS Northstar?

The oil filter is located at the bottom of the engine just forward of the oil pan. Look for a round cylindrical object. Unscrew it, coat the rubber gasket of the new one with oil and fill the new filter, and screw it on. Hand tight, then a skooch more. Don't muscle it on, or you won't get it off next time.