This oil pan is slightly deeper than original and requires approximately 6 quarts to fill. The increased oil capacity helps the engine run cooler and can extend oil change intervals. Note: On 64-65 Mustangs with power steering this deeper pan will rub the power steering center link. This can be corrected by either running the taller and stronger 66 engine mounts or by simply adding a 1/4" shim of washers to 1965 motor mounts to lift engine up.