One of the most innovative features of the W126 was its integrated plastic bumpers, a first for Mercedes, blending seamlessly with the body while improving crash protection. It also introduced flush-mounted glass to reduce wind noise, a feature that became a hallmark of modern luxury cars. Inside, the ergonomically designed cabin featured high-quality wood trim, orthopedically designed seats, and advanced climate control, reinforcing Mercedes' reputation for driver and passenger comfort.

Another pioneering feature was anti-lock brakes (ABS) and a driver's airbag, making it one of the safest sedans of its time. The self-leveling rear suspension ensured a smooth ride regardless of load, while the hydraulic power steering system provided effortless control. The 560 SEL’s timeless, well-proportioned design, combined with its legendary build quality, has made it one of the most respected and collectible Mercedes-Benz sedans ever produced.