Mercedes-Benz 2003 C-Class Coupe Operator's Manual page 323

Anticorrosion/antifreeze quantity
Model Approx. freeze protection
– 35°F (– 37°C)
C 230 Kompressor 4.2 US qt (4.0 l)
C 320 4.8 US qt (4.5 l)
– 49°F (– 45°C)
4.7 US qt (4.4 l)
5.3 US qt (5.0 l)
Technical data
Fuels, coolants, lubricants etc.
323