OM654
Inline-4 diesel- 654.920 CLS 220 d1.9 L · 1,950 cc
194 PS
143 kW · 191 hp à 3,800 tr/min
400 N·m
295 lb·ft à 1,600 tr/min
- 654.920 CLS 300 d1.9 L · 1,950 cc
245 PS
180 kW · 242 hp à 4,200 tr/min
500 N·m
369 lb·ft à 1,600 tr/min
Mercedes-Benz CLS-Class 4-Door Coupé (C257) · CLS
Third-generation four-door coupé elegance.

Launched in 2018, the C257 CLS shared the MRA platform with the E-Class and adopted a cleaner, more sculptural body with frameless side windows and a fastback profile moderated for better rear accommodation. Turbocharged inline-six and V8 engines — including the CLS 53 AMG with EQ Boost mild-hybrid assistance — powered a car positioned as a design-led alternative to the conventional E-Class saloon. The widescreen MBUX cockpit and advanced driver-assistance systems reflected the CLS's role as a technology showcase.
Built from 2018 to 2023, the C257 CLS represented the second and final iteration of Mercedes-Benz's original four-door coupé concept — a more mature car that proved the format could evolve beyond its novelty origins.

6 model designations for 2019 — engines, chassis codes and production figures for the C257.
| Modèle | Millésimes | Châssis | Moteur | Boîte | Total |
|---|---|---|---|---|---|
| CLS 220 d | 2019– | 257.314 | 654.920 | — | |
| CLS 300 d | 2019– | 257.318 | 654.920 | — | |
| CLS 350 d 4MATIC | 2019– | 257.321 | 656.929 | — | |
| CLS 400 d 4MATIC | 2019– | 257.323 | 656.929 | — | |
| CLS 350 | 2019– | 257.350 | 264.920 | — | |
| CLS 450 4MATIC | 2019– | 257.359 | 256.930 | — |


Four- and six-cylinder diesels and petrols — the OM654, OM656, M264 and M256 — as fitted to the C257.
194 PS
143 kW · 191 hp à 3,800 tr/min
400 N·m
295 lb·ft à 1,600 tr/min
245 PS
180 kW · 242 hp à 4,200 tr/min
500 N·m
369 lb·ft à 1,600 tr/min
286 PS
210 kW · 282 hp à 4,600 tr/min
600 N·m
443 lb·ft à 1,200 tr/min
340 PS
250 kW · 335 hp à 4,400 tr/min
700 N·m
516 lb·ft à 1,200 tr/min
299 PS
220 kW · 295 hp à 5,800 tr/min
400 N·m
295 lb·ft à 3,000 tr/min
367 PS
270 kW · 362 hp à 5,500 tr/min
500 N·m
369 lb·ft à 1,600 tr/min