Until 1994, Mercedes-Benz used an alphanumeric system for categorizing 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"indicates the vehicle is equipped with a diesel engine.
"E"(for "Einspritzung") indicates the vehicle's engine is equipped with petrol fuel injection.
"G"indicates the “Geländewagen” off-road vehicle.
"K"was used in the 1930s, indicating a supercharger ("Kompressor") equipped engine. One exception is the SSK, where K indicates "Kurz" (short-wheelbase).
"L"indicates "Leicht" (lightweight) for sporting models, and "Lang" (long-wheelbase) for sedan models.
"R"indicates "Rennen" (racing), used for racing cars (for example, the 300SLR).
"S"Sonderklasse "Special class" for flagship models.
"T"indicates "Touring" and an estate (or station wagon) body style.
Some models carry further designations indicating special features:
"4MATIC" indicates the vehicle is equipped with all-wheel-drive.
"BlueTEC" indicates a diesel engine with selective catalytic reduction exhaust after treatment.
BlueEFFICIENCY" indicates special fuel economy features (direct injection, start-stop system, aerodynamic modifications, etc.)
"CGI" (Charged Gasoline Injection) indicates direct gasoline injection.
"CDI" (Common-rail Direct Injection) indicates a common-rail diesel engine.
"Hybrid" indicates a gasoline- or diesel-electric hybrid.
"NGT" indicates a natural gas-fueled engine.
"Kompressor" indicates a supercharged engine.