Ford 2003 Mustang Owner's Manual page 146

Maintenance and care
3. Set the parking brake and ensure the gearshift is
securely latched in P.
4. Open the hood. Protect yourself from engine heat.
5. Locate and carefully
remove the engine oil
indicator (dipstick).
6. Wipe the indicator clean. Insert the indicator fully,
then remove it again.
If the oil level is between the ADD and FULL
marks or between the MIN and MAX marks
(depending on application), the oil level is
acceptable. DO NOT ADD OIL.
If the oil level is
below the ADD or
MIN mark, add
enough oil to raise
the level within the
ADD-FULL or within
the MIN-MAX range.
Oil levels above the F in FULL or above the MAX
mark, may cause engine damage. Some oil must
be removed from the engine by a service
technician.
7. Put the indicator back in and ensure it is fully
seated.
146
ADD 1 QT FULL
MIN MAX