Why was W140 so good?
The W140 S-Class Was Loaded With Technology This includes some notable features like Electronic Stability Program (ESP), Brake Assist System, Xenon HID headlights, side airbags, etc. ESP was developed by Mercedes-Benz and was later adopted by almost all other manufacturers due to its effectiveness. The W140 introduced a long list of groundbreaking innovations: Double-pane insulating glass for better noise and temperature insulation. Soft-close doors and trunk (vacuum-assisted closing). Electronic Stability Program (ESP) (introduced in 1995).