| 21 version of the engine | 12345 | | Typ | 325i | 325ix | 325i | 325ix | 324d |
| Engine | benzynowy | benzynowy | benzynowy | benzynowy | diesel |
| Type of injection | pośredni MPI | pośredni MPI | pośredni MPI | pośredni MPI | pompa wtryskowa |
| Engine Code | M20B25 | M20B25 | M20B25 | M20B25 | M21B24 |
| Years of mounting | 1983-1989 | 1986-1987 | 1986-1991 | 1986-1991 | 1985-1991 |
| Cylinders/valves | R6/12 | R6/12 | R6/12 | R6/12 | R6/12 |
| Displacement [cm³] | 2494 | 2494 | 2494 | 2494 | 2443 |
| Power [kW/PS/RPM] | 126/171/5800 | 126/171/5800 | 125/170/5800 | 125/170/5800 | 63/86/4800 |
| Torque [Nm/RPM] | 226/4000 | 226/4000 | 222/4300 | 222/4300 | 152/2500 |
| Timing gear | pasek | pasek | pasek | pasek | pasek |
| Particle filter | - | - | - | - | - |
| Gearbox | manual. 5b/aut. 4b | manual. 5b/aut. 4b | manual. 5b/aut. 4b | manual. 5b/aut. 4b | manual. 5b/aut. 4b |
| Drivetrain | tylny | 4x4 | tylny | 4x4 | tylny |
| Brakes, front/rear | tarczowe/tarczowe | tarczowe/tarczowe | tarczowe/tarczowe | tarczowe/tarczowe | tarczowe/bębnowe |
| Front suspension | kol. MacPhersona | kol. MacPhersona | kol. MacPhersona | kol. MacPhersona | kol. MacPhersona |
| Rear suspension | wielowahaczowe | wielowahaczowe | wielowahaczowe | wielowahaczowe | wielowahaczowe |
| Curb weight [kg] | 1125/1145 | 1215/1235 | 1180/1200 | 1255/1275 | 1195/1215 |
| Body dimensions [mm] | 4325/1645/1380 | 4325/1662/1400 | 4325/1645/1380 | 4325/1662/1400 | 4325/1645/1380 |
| Luggage capacity [l] | 425 | 404 | 425 | 404 | 425 |
| Acceleration 0-100km/h (0-62mph) [s] | 8,3/10,0 | 9,0/10,9 | 8,3/9,9 | 9,2/11,3 | 16,1/18,5 |
| Top speed [km/h] | 217/206 | 212/202 | 218/212 | 210/201 | 165/158 |
| Fuel cons. (city/h-way/comb.) [l/100km] | 12,2/6,4/8,9 | 12,4/7,4/9,6 | 12,9/7,2/9,7 | 13,7/8,1/10,5 | 9,6/5,3/7,3 |
| Fuel tank capacity [l] | 55 | 55 | 55 | 55 | 55 |
| Ratio kg/PS | 6.58/6.7 | 7.11/7.22 | 6.94/7.06 | 7.38/7.5 | 13.9/14.13 |