| 12 version of the engine | 123 | | Typ | 518 | 518i | 520 | 520i | 520i |
| Engine | benzynowy | benzynowy | benzynowy | benzynowy | benzynowy |
| Type of injection | gaźnik | pośredni MPI | gaźnik | pośredni MPI | pośredni MPI |
| Engine Code | M10B18 | M10B18 | M10B20 | M10B20 | M10B20 |
| Years of mounting | 1974-1981 | 1979-1981 | 1972-1977 | 1972-1975 | 1975-1977 |
| Cylinders/valves | R4/8 | R4/8 | R4/8 | R4/8 | R4/8 |
| Displacement [cm³] | 1766 | 1766 | 1990 | 1990 | 1990 |
| Power [kW/PS/RPM] | 66/90/5800 | 75/102/5800 | 85/115/5800 | 96/130/5800 | 92/125/5700 |
| Torque [Nm/RPM] | 140/3500 | 135/4500 | 162/3700 | 178/4500 | 172/4350 |
| Timing gear | łańcuch | łańcuch | łańcuch | łańcuch | łańcuch |
| Particle filter | - | - | - | - | - |
| Gearbox | manualna 4,5b | manualna 4b | man. 4,5b/aut. 3b | man. 4,5b/aut. 3b | man. 4,5b/aut. 3b |
| Drivetrain | tylny | tylny | tylny | tylny | tylny |
| Brakes, front/rear | tarcz./tarcz. | tarcz./tarcz. | tarcz./tarcz. | tarcz./tarcz. | tarcz./tarcz. |
| Front suspension | kol. MacPhersona | kol. MacPhersona | kol. MacPhersona | kol. MacPhersona | kol. MacPhersona |
| Rear suspension | wielowahaczowe | wielowahaczowe | wielowahaczowe | wielowahaczowe | wielowahaczowe |
| Curb weight [kg] | 1240 | 1350 | 1240/1260 | 1250/1260 | 1260/1270 |
| Body dimensions [mm] | 4620/1690/1425 | 4620/1690/1425 | 4620/1690/1425 | 4620/1690/1425 | 4620/1690/1425 |
| Luggage capacity [l] | 440 | 440 | 440 | 440 | 440 |
| Acceleration 0-100km/h (0-62mph) [s] | 14,8 | 14,2 | 12,3/13,8 | 11,1/12,7 | 11,3/12,9 |
| Top speed [km/h] | 160 | 167 | 176/171 | 183/175 | 181/173 |
| Fuel cons. (city/h-way/comb.) [l/100km] | 12,6/7,2/9,8 | 12,6/7,2/9,8 | - / - /9,3 | - / - /10,1 | - / - /10,5 |
| Fuel tank capacity [l] | 70 | 70 | 70 | 70 | 70 |
| Ratio kg/PS | 13.78 | 13.24 | 10.78/10.96 | 9.62/9.69 | 10.08/10.16 |