The Mercedes-Benz W126 S-Class, launched in 1979, elevated the brand’s status as a luxury and engineering powerhouse, building upon the foundation laid by the preceding W116. While the entire W126 range became synonymous with 1980s affluence, the 1989 Mercedes-benz 560 Sel stood as the ultimate expression of this luxurious and technologically advanced sedan. This model year, in particular, represents the pinnacle of the W126 generation, incorporating refinements and features that solidified its place as a true flagship vehicle.
The W126 marked a significant shift towards aerodynamic efficiency and improved fuel economy. Compared to its predecessor, it boasted a 14 percent reduction in drag and a lighter curb weight, starting around 3,600 pounds. This focus on efficiency, particularly in its six-cylinder and diesel configurations, was noteworthy for its era, especially when contrasted with larger, less economical American sedans. Safety was also paramount, with the W126 pioneering safety features. By 1989, a driver-side airbag was already a standard feature, and for this model year, Mercedes-Benz introduced the passenger-side airbag, further enhancing occupant protection. Pretensioned seat belts and traction control systems were other innovations that underscored the W126’s commitment to safety.
For the American market, the W126 S-Class evolution can be broadly divided into two phases: 1979-1985 and 1986-1991. The initial phase saw models like the 380SE/SEL and 500SEL, both equipped with V8 engines. However, the 1986 mid-cycle update brought significant changes, including a refined engine lineup and visual enhancements. This refresh introduced the 300SE/SEL (inline-six), the 420SEL, and crucially, the 1989 Mercedes-Benz 560 SEL. While coupe versions (SEC) were also available, the SEL, with its long-wheelbase, represented the ultimate in rear passenger comfort and prestige. Notably, models like the earlier 380s and even the 420s were often perceived as less potent due to emissions controls. The 300 models from 1986 onwards, however, offered performance comparable to the earlier 420s.
Diesel engines were also a popular choice within the W126 range. From 1980 to 1985, the 300SD (five-cylinder diesel) was offered in the U.S., followed by the 300SDL (six-cylinder diesel) in 1986 and 1987. Continuing the diesel legacy, the 350SD and 350SDL models appeared in 1990 and 1991.
The 1986-1991 W126 models, including the 1989 Mercedes-Benz 560 SEL, are easily identifiable by their updated aesthetics. Flush-face halogen headlamps and integrated headlight wipers gave them a more modern and streamlined appearance. Interior enhancements were equally significant. Electronic automatic climate control, an electronically adjustable steering column, and leather trim on the steering wheel and shift lever became standard or available features, depending on the model. The 1989 560 SEL took luxury a step further, including standard heated front seats and offering an exclusive two-place rear seating option. This configuration featured power-adjustable rear seats, a sophisticated burl-walnut center console dividing the rear passengers, and opulent Arametta suede-like leather upholstery, creating an unparalleled level of rear cabin luxury.
Mercedes-Benz W126 powertrains are renowned for their durability. Engines frequently surpass 200,000 miles with proper maintenance, often outlasting the transmissions. While front-end and steering components will require replacement over time, typical repairs are generally no more complex than other European vehicles of the same era. However, parts costs can be a factor in ownership expenses. Vacuum-operated power locks could present occasional issues with intermittent failures or slow operation. The climate control system, while advanced for its time, is less effective compared to modern systems and even contemporary American luxury cars, and can be complex and costly to repair.
Diesel engines in the W126 generally exhibit even greater longevity than their gasoline counterparts. However, fuel-system issues can arise in colder climates or with infrequent use. It’s worth noting that the 350SD and SDL models have faced some criticism regarding potential connecting rod and cylinder head problems in certain years. Regular engine mount replacement is crucial for later diesel models. For 1986 and 1987 300SD California-emissions models, the original particulate filter should ideally be replaced with a more modern oxidation catalyst for improved performance and emissions.
The S-Class, particularly models like the 1989 Mercedes-Benz 560 SEL, became a symbol of the U.S. gray market import phenomenon in the mid-to-late 1980s. Models like the 500SE and 500SEL, highly regarded as top-tier within the W126 range from 1985 to 1991, were not officially sold by Mercedes-Benz USA. This limited availability, coupled with restricted feature and trim options offered through official channels, drove dealerships and individuals to import approximately 22,000 vehicles through gray market channels, circumventing the “official” U.S. sales network to meet consumer demand for these highly desirable luxury sedans. The 1989 Mercedes-Benz 560 SEL stands as a testament to this era, representing peak German engineering, luxurious appointments, and enduring style that continues to captivate classic car enthusiasts today.
