The 1990 Mercedes-Benz 300S belongs to the W126 generation of the S-Class produced from 1979 to 1992. It's powered by a 3.0-liter L6 engine that delivers 177 horsepower. This engine is paired with a 5-speed automatic transmission, providing a smooth and comfortable ride. The acceleration, while not particularly quick, is adequate. The 300S is equipped with standard features at that time, including a sunroof, air conditioning, power windows, and anti-lock brakes. The build quality for this model is outstanding, widely noted for its robustness and justifying the high price tag it commanded at that time.