Until 1994, Mercedes-Benz used an alphanumeric system for categorising their vehicles, consisting of a number sequence approximately equal to the engine's displacement in liters multiplied by 100, followed by an arrangement of alphabetical suffixes indicating body style and engine type.
- "C" indicates a coupe or cabriolet body style.
- "D" means the vehicle is equipped with a diesel engine.
- "E" (for "Einspritzen") means the vehicle's engine is equipped with petrol fuel injection. In most cases (the 600 limousine being the exception), if neither "E" or "D" is present, the vehicle has a petrol engine with a carburettor.
