M110
Inline-6- 110.9232.7 L · 2,746 cc
156 PS
115 kW · 154 hp at 5,500 rpm
223 N·m
164 lb·ft at 4,000 rpm
- 110.9842.7 L · 2,746 cc
185 PS
136 kW · 182 hp at 5,800 rpm
240 N·m
177 lb·ft at 4,500 rpm
Mercedes-Benz Executive Sedan · W123
The diesel that defined a generation.

From taxi-spec 200 D and 240 D diesels to fuel-injected 230 E and 280 E petrol models, the W123 covered every need with the same over-engineered chassis, independent suspension, and interior fit and finish that made deferred replacement a way of life. Estate S123 and coupé C123 variants extended the architecture without compromising the standard.
Between 1975 and 1985, 2,397,219 were built.

11 model designations across 1975–1985 — engines, chassis codes and production figures for the W123.
| Model | Model years | Chassis | Engine | Transmission | Total |
|---|---|---|---|---|---|
| 200 D | 1975–1985 | 123.120 | 615.940 | 722.116 | 378,138 |
| 220 D | 1975–1979 | 123.126 | 615.941 | 722.116 | 56,736 |
| 240 D | 1975–1985 | 123.123 | 616.912 | 722.117 | 454,780 |
| 300 D | 1975–1985 | 123.130 | 617.912 | 722.118 | 331,999 |
| 300 D Turbodiesel | 1981–1985 | 123.133 | 617.952 | 75,261 | |
| 200 | 1976–1980 | 123.020 | 115.938 | 722.115 | 158,772 |
| 200 | 1980–1985 | 123.220 | 102.920 | 722.121 | 217,315 |
| 230 | 1975–1980 | 123.023 | 115.954 | 722.119 | 196,185 |
| 230 E | 1979–1985 | 123.223 | 102.980 | 722.122 | 245,588 |
| 280 | 1975–1981 | 123.030 | 110.923 | 722.111 | 33,206 |
| 280 E | 1975–1985 | 123.033 | 110.984 | 722.112 | 126,375 |
* The published production figure covers every series of that model; the source does not break it down further.


The M110 as fitted to the W123.
156 PS
115 kW · 154 hp at 5,500 rpm
223 N·m
164 lb·ft at 4,000 rpm
185 PS
136 kW · 182 hp at 5,800 rpm
240 N·m
177 lb·ft at 4,500 rpm