1985-1987 Mercedes-Benz S-class SEL (V126 facelift ) 560 SEL V8 CAT (242 Hp) Automatic

The Mercedes-Benz S-Class SEL 560 SEL, produced from September 1985 to September 1987, represents the pinnacle of luxury and performance within the W126 generation. This long-wheelbase (SEL) variant, equipped with the 5.6-liter V8 engine and a catalytic converter (CAT), was positioned as the flagship model, offering a more refined and powerful experience than its smaller-engined siblings. The W126 S-Class, introduced in 1979, established many of the safety and technological features that would become hallmarks of the S-Class line, and the facelifted models of 1985 further refined the design and improved performance. The 560 SEL catered to buyers seeking the ultimate in German engineering and opulent comfort.

Technical Specifications

INTRODUCTION

The 560 SEL, produced between 1985 and 1987, was the ultimate expression of the W126 S-Class. It represented a significant upgrade over the earlier models, benefitting from the 1985 facelift which included revised styling, improved aerodynamics, and enhanced engine management. The SEL designation indicated the long-wheelbase version, adding approximately 10 inches to the standard S-Class wheelbase, providing significantly more rear passenger legroom. This model was aimed at discerning buyers who prioritized luxury, performance, and a smooth, refined driving experience. It was a direct competitor to the BMW 750iL and other top-tier luxury sedans of the era.

Powertrain & Engine Architecture

The heart of the 560 SEL is the M117 E 56 engine, a 5.6-liter (5547 cc) naturally aspirated V8. This engine, a descendant of the earlier M117 series, featured a cast-iron block and aluminum cylinder heads. The engine code 117.968 signifies the specific iteration used in the facelifted 560 SEL. It employed Bosch K-Jetronic fuel injection, a mechanical system known for its reliability and precise fuel delivery. The single overhead camshaft (SOHC) design operated two valves per cylinder. The catalytic converter, denoted by the “CAT” in the model name, was a crucial addition for meeting increasingly stringent emissions regulations.

The 560 SEL was exclusively offered with a four-speed automatic transmission (722.305). This transmission was designed to provide smooth and seamless gear changes, complementing the engine’s torque characteristics. While not as technologically advanced as some later automatic transmissions, it was known for its durability and reliability. The transmission’s gear ratios were optimized for both comfortable cruising and responsive acceleration.

Driving Characteristics

The 560 SEL offered a driving experience that prioritized comfort and effortless power. The 242 horsepower and 390 lb-ft of torque provided brisk acceleration, with 0-60 mph times consistently around 7.2 to 7.6 seconds. The long wheelbase and sophisticated suspension – double wishbones at the front and a threaded twist beam at the rear – delivered a remarkably smooth and stable ride, even on imperfect road surfaces. Compared to the 380SE or 420SE, the 560 SEL offered a noticeable increase in performance, particularly in mid-range acceleration. The automatic transmission, while smooth, didn’t offer the same level of driver engagement as a manual gearbox, but it aligned perfectly with the car’s luxury-focused character.

Equipment & Trim Levels

The 560 SEL came standard with a comprehensive list of luxury features. Leather upholstery was standard, along with power-adjustable front seats with memory function. Climate control, power windows, power locks, and a premium sound system were also included. The interior trim was typically finished in wood veneer, adding to the opulent ambiance. Optional extras included a sunroof, heated seats, and a rear seat entertainment system. The SEL models also featured upgraded interior lighting and additional sound insulation compared to the standard wheelbase S-Class.

Chassis & Braking

The 560 SEL featured a robust chassis designed to handle the engine’s power and provide a comfortable ride. The front suspension utilized double wishbones, while the rear employed a threaded twist beam. Braking duties were handled by ventilated discs at the front and solid discs at the rear. Anti-lock braking system (ABS) was standard, enhancing safety and control during hard braking. The steering system was a cone worm with recirculation balls, providing a weighted and precise feel. The 560 SEL rode on 7J x 15 inch wheels, typically fitted with 215/65 R15 tires.

Market Reception & Comparison

The 560 SEL was widely praised by automotive critics for its luxurious interior, smooth ride, and powerful engine. It was considered a benchmark in the luxury sedan segment. However, its fuel economy was a common criticism, reflecting the realities of a large-displacement V8 engine in the 1980s. Compared to the 380SE and 420SE, the 560 SEL commanded a significant price premium, reflecting its higher performance and more extensive features. The 560 SEL also offered a more refined experience than the diesel-powered 300SDL, which prioritized fuel efficiency over outright performance.

Legacy

The W126 S-Class, and particularly the 560 SEL, is highly regarded by enthusiasts today. The M117 engine is known for its durability and relatively straightforward maintenance, although parts can be expensive. Well-maintained examples of the 560 SEL are increasingly collectible, attracting buyers who appreciate its classic styling, luxurious features, and robust engineering. While fuel economy remains a concern, the 560 SEL continues to offer a unique and rewarding driving experience, representing a golden age of German automotive engineering. The car’s build quality and timeless design ensure its continued relevance in the classic car market.