Mercury 2002 Cougar Owner's Manual page 173

2.0L I4 engine
2.5L V6 engine
6. Wipe the indicator clean. Insert the indicator fully, then remove it
again.
If the oil level is between the MIN and MAX marks, the oil level is
acceptable. DO NOT ADD OIL.
If the oil level is below the MIN
mark, add enough oil to raise the
level within the MIN-MAX range.
Oil levels 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.
Maintenance and Specifications
173