| 9 version of the engine | 12 | | Typ | 318i | 320 | 320 | 320i | 323i |
| Engine | benzynowy | benzynowy | benzynowy | benzynowy | benzynowy |
| Type of injection | pośredni MPI | gaźnik | gaźnik | pośredni MPI | pośredni MPI |
| Engine Code | M10B18 | M10B20 | M20B20 | M10B20 | M20B23 |
| Years of mounting | 1979-1982 | 1975-1977 | 1977-1982 | 1975-1982 | 1978-1982 |
| Cylinders/valves | R4/8 | R4/8 | R4/8 | R4/8 | R6/12 |
| Displacement [cm³] | 1766 | 1990 | 1990 | 1990 | 2316 |
| Power [kW/PS/RPM] | 77/105/5800 | 80/109/5800 | 90/122/6000 | 92/125/5800 | 105/143/5800 |
| Torque [Nm/RPM] | 145/4000 | 157/3700 | 160/4000 | 172/4300 | 190/4500 |
| Timing gear | łańcuch | łańcuch | pasek | łańcuch | pasek |
| Particle filter | - | - | - | - | - |
| Gearbox | man. 4,5b/aut. 3b | man. 4,5b/aut. 3b | 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] | 1030/1040 | 1030/1050 | 1090/1125 | 1050/1070 | 1135/1155 |
| Body dimensions [mm] | 4355/1610/1380 | 4355/1610/1380 | 4355/1610/1380 | 4355/1610/1380 | 4355/1610/1380 |
| Luggage capacity [l] | 400 | 400 | 400 | 400 | 400 |
| Acceleration 0-100km/h (0-62mph) [s] | 11,5/13,2 | 11,2/ - | 10,7/13,0 | 9,9/ - | 9,5/11,8 |
| Top speed [km/h] | 171/166 | 170/165 | 181/176 | 182/176 | 190/185 |
| Fuel cons. (city/h-way/comb.) [l/100km] | 10,4/7,1/8,9 | - / - /10,0 | 12,0/7,5/9,9 | - / - /10,6 | 12,5/8,1/10,6 |
| Fuel tank capacity [l] | 58 | 58 | 58 | 58 | 58 |
| Ratio kg/PS | 9.81/9.9 | 9.45/9.63 | 8.93/9.22 | 8.4/8.56 | 7.94/8.08 |