1993 GMC Suburban Owner's Manual - Page 276

. , ... K2613 To Check Engine Oil: Pulloutthedipstickandclean it withapapertowel or cloth,thenpushitback in allthe way.Remove it again,keepingthetip lower. When to Add Oil: If theoil is atorbelowthe ADD mark,then you'll need to add someoil.But you must use therightkind.Thispartexplainswhat kind of oil touse.Forcrankcasecapacity,see"CapacitiesandSpecifications" in theIndex. 6-1 0