The Mercedes-Benz W123, produced from July 1975 to July 1981, represents a pivotal generation in the lineage of the Mercedes-Benz E-Class. Positioned as a mid-size executive car, the W123 succeeded the W114 and W115 models, establishing a new benchmark for safety, build quality, and refinement in its segment. The 280 model, equipped with a 2.8-liter inline-six engine producing 156 horsepower, was a premium offering within the W123 range, appealing to buyers seeking a blend of performance and luxury. The W123 is highly regarded for its robust engineering and remains a popular classic car among enthusiasts today.
The Mercedes-Benz W123 280: A Legacy of Engineering
The W123 was a significant departure from its predecessors, incorporating advancements in crumple zone technology and overall structural integrity. This focus on safety was groundbreaking for the era and contributed to the W123’s reputation as a remarkably durable vehicle. The 280 variant, distinguished by its larger engine, offered a more spirited driving experience compared to the four-cylinder models. While not a sports car, the 280 provided ample power for comfortable highway cruising and confident overtaking. The W123 was sold extensively throughout Europe and also found a niche market in North America, where its reputation for reliability resonated with buyers.
Engine & Performance
The heart of the W123 280 is the M 110 V 28 / 110.923 2.8-liter inline-six engine. This naturally aspirated engine delivers 156 horsepower at 5500 rpm and 223 Nm (164.48 lb.-ft.) of torque at 4000 rpm. The engine features a single overhead camshaft (SOHC) valvetrain with two valves per cylinder and utilizes a carburetor fuel injection system. While not the most technologically advanced system by modern standards, the carburetor proved reliable and contributed to the engine’s smooth operation. The engine’s power-to-weight ratio of 9.3 kg/Hp (107.2 Hp/tonne) and torque-to-weight ratio of 6.5 kg/Nm (153.3 Nm/tonne) provided respectable performance for the time. Acceleration from 0 to 100 km/h (0-62 mph) takes 10.6 seconds, while 0 to 60 mph is achieved in approximately 10.1 seconds. The W123 280 boasts a top speed of 190 km/h (118.06 mph). Fuel economy is rated at 18.5 l/100 km (12.7 US mpg) in urban conditions and 10.2 l/100 km (23.1 US mpg) on the open road.
Design & Features
The W123 is characterized by its elegant, understated design. Available exclusively as a four-door sedan, the W123 prioritizes practicality and passenger comfort. Its clean lines and relatively compact dimensions contribute to its timeless appeal. The interior is well-appointed, featuring comfortable seating for five passengers and a functional dashboard layout. Safety features, while limited by the standards of the 1970s, were advanced for the time and included crumple zones, a reinforced passenger cell, and disc brakes on all four wheels. Hydraulic power steering was standard, enhancing driving ease. The W123 280 typically featured higher-quality interior trim and additional comfort features compared to the base models. The vehicle’s robust construction and durable materials contribute to its longevity, making it a popular choice for restoration projects.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | W123 |
| Generation | W123 |
| Type (Engine) | 280 (156 Hp) |
| Start of production | July, 1975 |
| End of production | July, 1981 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 18.5 l/100 km (12.7 US mpg) |
| Fuel consumption (extra urban) | 10.2 l/100 km (23.1 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 10.6 sec |
| Acceleration 0 – 62 mph | 10.6 sec |
| Acceleration 0 – 60 mph | 10.1 sec |
| Maximum speed | 190 km/h (118.06 mph) |
| Weight-to-power ratio | 9.3 kg/Hp |
| Weight-to-torque ratio | 6.5 kg/Nm |
| Power | 156 Hp @ 5500 rpm |
| Torque | 223 Nm @ 4000 rpm (164.48 lb.-ft. @ 4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 110 V 28 / 110.923 |
| Engine displacement | 2746 cm3 (167.57 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 78.8 mm (3.1 in.) |
| Compression ratio | 8.7:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated |
| Valvetrain | DOHC |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Coolant capacity | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1455 kg (3207.73 lbs.) |
| Max. weight | 1975 kg (4354.13 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4725 mm (186.02 in.) |
| Width | 1786 mm (70.31 in.) |
| Height | 1438 mm (56.61 in.) |
| Wheelbase | 2795 mm (110.04 in.) |
| Front track | 1488 mm (58.58 in.) |
| Rear track | 1446 mm (56.93 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 4 gears, manual transmission |
| Front suspension | Double wishbone |
| Rear suspension | Trailing arm |
| Front brakes | Disc |
| Rear brakes | Disc |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic |
| Tires size | 195/70 R14 |
| Wheel rims size | 6J x 14 |
The Mercedes-Benz W123 280 remains a highly sought-after classic, celebrated for its engineering excellence, durability, and timeless design. Its impact on the automotive industry is undeniable, setting a new standard for mid-size luxury cars and influencing subsequent generations of Mercedes-Benz vehicles.
