With engine oil filter change, the 4.6 L V8 takes :  In the 1998 Ford Mustang (5 quarts)  In the 1998 Ford Expedition (6 quarts)  In the 1998 Ford F-150 (6 quarts). 3 people found this useful.Edit.ccording to the 2002 Ford Mustang Owner Guide :    With engine oil filter change :    The 3.8 liter V6 engine takes :    (5.0 U.S. quarts of 5W-20) . 6 people found this useful.