M110
Inline-6- 110.923 2.7 L · 2,746 cc
156 PS
115 kW · 154 hv / 5,500 r/min
223 N·m
164 lb·ft / 4,000 r/min
- 110.984 2.7 L · 2,746 cc
185 PS
136 kW · 182 hv / 5,800 r/min
240 N·m
177 lb·ft / 4,500 r/min
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, 2,389,140 saloons and long-wheelbase limousines were built.

11 model designations across 1975–1985 — engines, chassis codes and production figures for the W123.
| Malli | Mallivuodet | Valmistettu | Alusta | Moottori | Vaihteisto | Yhteensä |
|---|---|---|---|---|---|---|
| 200 D | 1976–1985 | 02.1976–04.1985 | 123.120 | 615.940 | 722.116 | 378,138 |
| 220 D | 1976–1979 | 02.1976–03.1979 | 123.126 | 615.941 | 722.116 | 56,736 |
| 240 D | 1976–1985 | 02.1976–11.1985 | 123.123 | 616.912 | 722.117 | 448,986 |
| 240 D LWB | 1978–1985 | 09.1977–11.1985 | 123.125 | 616.912 | 722.117 | 3,841 |
| 300 D | 1976–1985 | 02.1976–11.1985 | 123.130 | 617.912 | 722.118 | 324,718 |
| 300 D LWB | 1978–1985 | 09.1977–11.1985 | 123.132 | 617.912 | 722.118 | 4,679 |
| 300 D Turbodiesel | 1982–1985 | 08.1981–08.1985 | 123.133 | 617.952 | 75,261 | |
| 200 | 1976–1980 | 02.1976–08.1980 | 123.020 | 115.938 | 722.115 | 158,772 |
| 200 | 1980–1985 | 08.1980–11.1985 | 123.220 | 102.920 | 722.121 | 217,315 |
| 230 | 1976–1980 | 02.1976–08.1980 | 123.023 | 115.954 | 722.119 | 195,920 |
| 230 E | 1980–1985 | 07.1980–11.1985 | 123.223 | 102.980 | 722.122 | 245,588 |
| 250 | 1976–1985 | 04.1976–12.1985 | 123.026 | 123.920 | 722.113 | 114,796 |
| 250 LWB | 1978–1985 | 09.1977–12.1985 | 123.028 | 123.920 | 722.113 | 5,180 |
| 280 | 1976–1981 | 1975–1981 | 123.030 | 110.923 | 722.111 | 33,206 |
| 280 E | 1976–1985 | 1975–1985 | 123.033 | 110.984 · 110.988 | 722.112 | 126,004 |
* Julkaistu tuotantoluku kattaa kyseisen mallin kaikki sarjat; lähde ei erittele sitä tarkemmin.

The engine, safety and facelift changes that distinguish the three W123 production series.

Six engine families — the OM615 through OM617 diesels and the M102 through M115 petrols — as fitted to the W123.
156 PS
115 kW · 154 hv / 5,500 r/min
223 N·m
164 lb·ft / 4,000 r/min
185 PS
136 kW · 182 hv / 5,800 r/min
240 N·m
177 lb·ft / 4,500 r/min
55 PS
40 kW · 54 hv / 4,200 r/min
113 N·m
83 lb·ft / 2,400 r/min
60 PS
44 kW · 59 hv / 4,200 r/min
126 N·m
93 lb·ft / 2,400 r/min
65 PS
48 kW · 64 hv / 4,200 r/min
137 N·m
101 lb·ft / 2,400 r/min
80 PS
59 kW · 79 hv / 4,000 r/min
172 N·m
127 lb·ft / 2,400 r/min
121 PS
89 kW · 119 hv / 4,350 r/min
230 N·m
170 lb·ft / 2,400 r/min
94 PS
69 kW · 93 hv / 4,800 r/min
158 N·m
117 lb·ft / 3,000 r/min
109 PS
80 kW · 108 hv / 4,800 r/min
186 N·m
137 lb·ft / 3,000 r/min
109 PS
80 kW · 108 hv / 5,200 r/min
170 N·m
125 lb·ft / 3,000 r/min
136 PS
100 kW · 134 hv / 5,100 r/min
205 N·m
151 lb·ft / 3,500 r/min