The M120 6.0L V12 is revered as Mercedes' most ambitious engine of the era, described as the only quad-cam four-valve-per-cylinder V12 the company built, with linear power and near-bulletproof durability once maintained. US output was 402 bhp for 1992, dropping to 389 bhp for 1993 and later. …
The M120 V12 (600SEL/S600) as a high-water-mark engine
Mercedes-Benz S-Class (W140) · mechanical