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| Mercedes-Benz M123 | |
|---|---|
 M123.920 engine | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 1976–1984 |
| Layout | |
| Configuration | Naturally aspirated Straight-6 |
| Displacement | 2.5 L (2,525 cc) |
| Cylinder bore | 86 mm (3.39 in) |
| Piston stroke | 72.45 mm (2.85 in) |
| Valvetrain | SOHC |
| Combustion | |
| Fuel system | Solex 4A1 carburetor |
| Fuel type | Petrol |
| Cooling system | Water cooled |
| Output | |
| Power output | 95–104 kW (129–141 PS; 127–139 hp) |
| Torque output | 196–200 N⋅m (145–148 lb⋅ft) |
| Chronology | |
| Predecessor | M180 |
| Successor | M103 |
The M123 engine family was a straight-6 automobile engine from Mercedes-Benz, used from 1976 to 1984 in the W123 series models 250 and 250 T. It replaced the 6-cylinder engines M180 in the 230 and M130 in the 250 (2.8 liter) versions from the W114 series.
The M123 was succeeded by the M103, introduced in 1984 with the W124 series.