Produced between 1979 to 1991, the Mercedes-Benz W126 was an S-class This production total has made it the most popular Mercedes-Benz S-Class to this day Powering the 1986 Mercedes-Benz 420 SEL was an overhead-cam eight-cylinder engine with light alloy block and heads. It displaced 256 cubic-inches and offered just over 200 horsepower and nearly 230 ft-lbs of torque Power seats, windows Heated seats Sunroof Plenty of power in the full size sedan