1971-1972 Mercedes-Benz W108 SEL 280 SEL 4.5 V8 (198 Hp) Automatic

The Mercedes-Benz W108 SEL 280 SEL 4.5 V8 (198 Hp) Automatic stands as a quintessential embodiment of luxury, sophistication, and robust engineering from the early 1970s. Produced between May 1971 and November 1972, this particular variant of the W108/W109 series represented the pinnacle of Stuttgart’s executive sedan offerings, specifically tailored for markets demanding greater power and refinement, notably the United States. As a long-wheelbase (SEL) model, it prioritized rear passenger comfort and an imposing road presence, cementing its status as a flagship vehicle of its era. This generation of Mercedes-Benz sedans bridged the gap between the more ornate “fintail” models and the more angular, modern designs that would follow, establishing a timeless aesthetic that continues to be admired by classic car enthusiasts and collectors worldwide. Its mechanical integrity, combined with a commitment to driver and passenger comfort, solidified the W108’s reputation as a benchmark for luxury automobiles, a legacy that the 280 SEL 4.5 V8 proudly upheld through its brief but impactful production run.

The Mercedes-Benz W108 SEL: A Legacy of Luxury and Engineering

The W108/W109 series, introduced in 1965, evolved from the W111/W112 “fintail” sedans, shedding the distinctive tailfins for a more understated, elegant design. The “SEL” designation, meaning “Sonderklasse Einspritzmotor Lang” (Special Class, Fuel-Injected Engine, Long Wheelbase), indicated its position at the top of the Mercedes-Benz sedan hierarchy. The 280 SEL 4.5 V8 variant, in particular, was developed largely for the North American market, where buyers appreciated the smooth, effortless power of a large displacement V8 engine. This model represented a significant step for Mercedes-Benz in adapting its offerings to specific regional demands, blending traditional German engineering prowess with the performance expectations of a crucial export market. Its relatively short production window underscores its specialized nature, making it a distinctive and sought-after model among the broader W108 family.

Engine and Performance: The Heart of the 280 SEL 4.5 V8

At the core of the Mercedes-Benz W108 SEL 280 SEL 4.5 V8’s appeal was its formidable M 117 E 45 engine. This naturally aspirated, front-longitudinal V8 powerhouse boasted a displacement of 4520 cubic centimeters (275.83 cubic inches). With a cylinder bore of 92 mm (3.62 in.) and a piston stroke of 84.99 mm (3.35 in.), and a compression ratio of 8:1, this engine was engineered for smooth, reliable power delivery rather than outright high-revving performance. The multi-port manifold injection system, advanced for its time, ensured precise fuel delivery and efficiency, contributing to the engine’s refined character. This robust V8 generated a healthy 198 horsepower at 4500 rpm, translating to a power-per-liter rating of 43.8 Hp/l. More importantly for a luxury cruiser, it produced a substantial 264.05 lb.-ft. (358 Nm) of torque at a relatively low 3000 rpm, providing excellent low-end grunt and effortless acceleration.

Power was channeled to the rear wheels via a 3-speed automatic transmission, a common and highly regarded setup for luxury vehicles of this era, prioritizing seamless gear changes and a relaxed driving experience. This powertrain enabled the 280 SEL 4.5 V8 to accelerate from 0 to 60 mph in a respectable 9.6 seconds (0-100 km/h in 10.1 seconds) and achieve a top speed of 124.27 mph (200 km/h). While these figures might seem modest by today’s standards, they were highly competitive for a luxury sedan weighing 3758.88 lbs (1705 kg) in the early 1970s. The weight-to-power ratio of 8.6 kg/Hp (116.1 Hp/tonne) and a weight-to-torque ratio of 4.8 kg/Nm (210 Nm/tonne) underscore the engine’s ability to move the substantial sedan with authority. Fuel economy, rated at 15.7 US mpg (15 l/100 km) combined, was typical for a large V8 of its day, consuming gasoline from an 82-liter (21.66 US gallon) fuel tank, offering a decent cruising range.

Design and Features: Timeless Elegance and Advanced Engineering

The Mercedes-Benz W108 SEL 280 SEL 4.5 V8 embodied a design philosophy of understated elegance and functional beauty. Its sedan body type, with four doors and seating for five, was characterized by clean lines, a stately grille, and large glass areas that provided excellent visibility. Measuring 196.85 inches (5000 mm) in length, 71.26 inches (1810 mm) in width, and 56.69 inches (1440 mm) in height, the W108 possessed a commanding presence. The long wheelbase of 112.2 inches (2850 mm) was a hallmark of the SEL models, directly contributing to superior ride quality and generous legroom for rear passengers, a key selling point for a luxury chauffeur-driven or executive vehicle.

Beyond its aesthetic appeal, the W108 featured advanced engineering for its time that contributed significantly to its legendary ride comfort and handling. The front suspension utilized a double wishbone setup, providing precise wheel control and stability. The rear suspension was particularly notable, incorporating a hydro-pneumatic element combined with trailing arms. This sophisticated system allowed for self-leveling capabilities, maintaining a consistent ride height regardless of load, a feature usually found in more exotic or specialized vehicles. Braking performance was handled by disc brakes at both the front and rear, providing confident stopping power for a vehicle of its size and speed. Steering was managed by a cone worm with recirculation balls system, augmented by hydraulic power steering, ensuring ease of maneuverability at low speeds and stable control at higher velocities. The vehicle rode on 6J x 14-inch wheel rims, shod with tires appropriate for its luxury touring mission. These combined features solidified the W108’s reputation for being exceptionally comfortable, stable, and surprisingly agile for a large sedan, making it a pleasure to drive or be driven in over long distances.

Technical Specifications: Mercedes-Benz W108 SEL 280 SEL 4.5 V8 (198 Hp) Automatic