How much oil in a 1997 suburban?

Approximately 5 quarts, including the capacity of the oil filter, is required for the 350 ci motor. If the motor is the 454 ci unit, then an 6 quarts will suffice. The best way to determine the proper level is to start with the numbers shown here, fill the motor, allow it to run for several minutes, then re-check the level on the dipstick. Depending on how much oil was drained previously and the capacity of the replacement filter, another 1/4 to 1/2 a quart may be necessary.