- Combustion principle: four-stroke petrol
- Configuration: front, longitudinal; vertical
- Engine type: M 123 V 25 / 123.920
- Number of cylinders / arrangement: 6 / in-line
- Bore x Stroke: 86.0 x 72.45 mm
- Total displacement: 2525 cc (tax classification: 2492 cc)
- Compression ratio: 8.7; from 09.1979: 9,0
- Rated output: 129 hp / 95 kW at 5500 rpm;~from 09.1979: 140 hp / 103 kW at 5500 rpm
- Rated torque: 196 Nm at 3500 rpm; from 09.1979: 200 Nm at 3500 rpm
- Number of valves / arrangement: 1 intake, 1 exhaust / overhead
- Valve operation: 1 overhead camshaft
- Camshaft drive: double roller chain
- Fuel system: 1 Solex 4 A dual compound downdraught carburettor
- Fuel tank: position / capacity: above the rear axle / 80 l
- Frame design: steel unit body
- Front-wheel suspension: double wishbone
- Rear-wheel suspension: semi-trailing arm axle (hydropneumatic level control optional)
- Front springs: coil springs, supplementary rubber suspension, torsion bar stabiliser
- Rear springs: coil springs, hydropneumatic spring struts, torsion bar stabiliser
- Shock absorber front/rear: telescopic shock absorbers
- Steering: recirculating-ball power steering
- Brake system (foot brake): hydraulic dual-circuit brake system with vacuum booster, antilock system optional from 08.1980; four-wheel disc brakes
- Parking brake (hand brake): mechanical (foot-operated), acting on rear wheels
- Wheels: sheet-steel disc wheels
- Wheel rims: 5 1/2 J x 15 H 2
- Tires: 185 HR 15 93 H
- Driven wheels: rear wheels
- Drivetrain: divided cardan shaft
- Gearing: 4-speed manual transmission
- Availibility: as standard
- Shifting: central floor gear shift lever
- Clutch: dry single-disc clutch
- Transmission type: change-speed gear
- Gear ratios: I. 3.98; II. 2.29; III. 1.45; IV. 1.0; R. 3.74
- Final drive ratio: 3.92; from 10.1981: 3.69
- Maximum speed: 185 km/h
- Acceleration 0-100 km/h: 11.3 s
- Fuel consumption: 9.7 / 11.9 / 17.1 l; from 10.1981: 9.0 / 11.4 / 14.8 l
- by Guideline: 80/1268/EEC: figures apply to 90 km/h / 120 km/h / urban cycle
- Gearing: 5-speed manual transmission
- Availibility: optional (from 10.1981)
- Shifting: central floor gear shift lever
- Clutch: dry single-disc clutch
- Transmission type: change-speed gear
- Gear ratios: I. 3.98; II. 2.29; III. 1.45; IV. 1.0; R. 3.74
- Final drive ratio: 3.69
- Maximum speed: 185 km/h
- Acceleration 0-100 km/h: 11.3 s
- Fuel consumption: 8.6 / 10.4 / 14.8 l
- by Guideline: 80/1268/EEC: figures apply to 90 km/h / 120 km/h / urban cycle
- Gearing: 4-speed automatic transmission
- Availibility: optional (until 09.1981)
- Shifting: central floor gear shift lever
- Clutch: hydraulic torque converter in automatic transmission
- Transmission type: planetary gear system
- Gear ratios: I. 3.98; II. 2.39; III. 1.46; IV. 1.0; R. 5.47
- Final drive ratio: 3.92
- Maximum speed: 180 km/h
- Acceleration 0-100 km/h: 12.2 s
- Fuel consumption: 10.1 / 12.9 / 16.0 l
- by Guideline: 80/1268/EEC: figures apply to 90 km/h / 120 km/h / urban cycle
- Gearing: 4-speed automatic transmission
- Availibility: optional (from 10.1981)
- Shifting: central floor gear shift lever
- Clutch: hydraulic torque converter in automatic transmission
- Transmission type: planetary gear system
- Gear ratios: I. 3.68; II. 2.41; III. 1.44; IV. 1.0; R. 5.14
- Final drive ratio: 3.69
- Maximum speed: 180 km/h
- Acceleration 0-100 km/h: 12.2 s
- Fuel consumption: 9.5 / 11.9 / 14.5 l
- by Guideline: 80/1268/EEC: figures apply to 90 km/h / 120 km/h / urban cycle
- Wheelbase: 3425 mm
- Front / rear track: 1477 / 1430 mm
- Length: 5355 mm
- Width: 1786 mm
- Height: 1480 mm
- Kerb weight: 1570 kg
- by Guideline: DIN 70020 (ready to drive, including fuel, spare wheel and tool kit)
- Gross weight: 2235 kg
- Units produced: 5180 saloons
- Prices: 09.1977: DM 34,798.50
01.1978: DM 35,112.00
04.1978: DM 36,332.80
12.1978: DM 37,072.00
05.1979: DM 37,268.00
01.07.1979: DM 37,600.75
16.07.1979: DM 38,273.10
09.1979: DM 38,668.60
03.1980: DM 40,182.80
08.1980: DM 40,939.90
07.1981: DM 42,262.00
09.1981: DM 42,397.60
01.1982: DM 43,561.50
07.1982: DM 45,064.40
07.1983: DM 45,463.20
08.1983: DM 46,968.00
01.1984: DM 48,051.00
09.1984: DM 49,476.00
04.1985: DM 50,901.00