The M119 departed from its predecessor in several fundamental ways. The cylinder head was a new four-valve aluminium unit with dual overhead camshafts, replacing the two-valve layout of the M117. The engine block used asbestos-free gaskets and featured improved oil flow. Connecting rods were forged steel, enabling piston cooling via sprayed oil, while the pistons themselves were iron-coated cast aluminium. An improved vibration damper system reduced NVH, and the aluminium oil pan incorporated bolted-on baffles to prevent oil foaming under cornering loads.
The intake camshaft timing was adjusted hydro-mechanically across three operating bands: retarded below 2,000 rpm for idle quality and cylinder scavenging, advanced between 2,000 and 4,700 rpm for increased torque, and retarded again above 4,700 rpm to improve volumetric efficiency at high engine speeds. This variable intake timing system was an early example of what would become standard practice across the automotive industry.
The 4.2 litre version (M119.975, displacing 4,196 cc) produced 275 hp at 5,700 rpm and 400 Newton-metres of torque at 3,900 rpm. Early applications in the W140 400SE and 400SEL produced slightly higher outputs, and a rare Japanese-market 400E 4.2 AMG variant achieved 312 PS. Road car applications included the W124 400E, W210 E 420, W140 400SE/400SEL/S 420, and the C140 420 SEC coupe.
The 5.0 litre version (4,973 cc) was the most widely deployed and motorsport-significant variant. In standard road trim it produced 326 PS at 5,700 rpm and 480 Newton-metres of torque at 3,900 rpm. The AMG-tuned E50 version (M119.985) pushed output to 347 PS at 5,550 rpm. Road applications spanned the W124 500E, W140 500SE and 500SEL, C140 500SEC, and R129 500SL. The 5.0 litre M119 also replaced the M120 V12 in the CLK-GTR race car for the successor CLK-LM, which subsequently won every race it entered in the FIA GT series — an outcome that led to the GT1 class being cancelled.
The 6.0 litre AMG variant produced between 375 hp and 415 PS depending on state of tune, with torque of approximately 580 Newton-metres. Applications included the E 60 AMG (W124 and W210), SL 60 AMG (R129), and various Japanese-market limited-edition AMG models produced between October 1993 and September 1999.
The M119's most celebrated racing chapter involved the 5.0 litre unit in turbocharged form. Installed in the Sauber C9 sports prototype, the twin-turbocharged M119 won the 1989 24 Hours of Le Mans outright. This was a landmark result for Mercedes-Benz, marking the marque's return to Le Mans victory after decades of absence. The biturbo M119 was subsequently used in the Mercedes-Benz C11, another Group C sports prototype, continuing to compete at the front of World Sportscar Championship events before being replaced by the purpose-built M291 engine in 1991.
The combination of the biturbo M119 with the Sauber C9's aerodynamic package proved formidable, producing competitive power outputs while the parent road unit's engineering rigour contributed to the mechanical reliability required for endurance racing distances.
The M119 remained in production across road cars until 1999, when it was superseded by the three-valve M113. During its decade in production, the engine served at both ends of the Mercedes-Benz lineup — from the 500E sports saloon developed in collaboration with Porsche, to the 500SL roadster and S-Class flagships. Its Le Mans victory in the Sauber C9 gave the engine an enduring place in motorsport history alongside its significance as a technically advanced road-car unit of the late 1980s and 1990s.