Ford 2001 Mercury Cougar Owner's Manual page 268

Capacities
Engine oil
Manual transaxle
Automatic transaxle
Power steering
Cooling system with heating
Windshield washer fluid
Fuel tank
Braking system
* Total capacity
** with automatic transaxle
Capacities and specifications
- with filter
- without
2.0 litre engine
4.25 l (4.5 qts)
3.75 l (4.0 qts)
2.6 l (2.7 qts)
NA
Fill to MAX mark
6.6 l (7.0 qts)*
Fill to top of reservoir
58.5 litres (15.4 gallons)
Fill to MAX mark
2.5 litre engine
5.5 l (5.8 qts)
5.0 l (5.3 qts)
9.6 l (10.2 qts)
9.5 l (10.0 qts)*
9.7 l (10.2 qts)**