However, generally speaking, a 1996 Cavalier would likely use a conventional 5W-30 or 10W-30 motor oil meeting the API certification requirements specified in your owner's manual (likely something like SG, SH, SJ, or possibly SL depending on the specific engine and any service bulletins issued since the car was new).
Do not rely solely on this general information. Always consult your owner's manual for the precise and most up-to-date recommendation.