Mercedes-Benz M120 engine

The Mercedes-Benz M120 engine is a naturally aspirated high-performance automobile piston V12 engine family used in the 1990s and 2000s in Mercedes' flagship models. The engine was a response to BMW's M70 V12 engine, introduced in 1987. While the 5-litre BMW unit developed 300 PS, Mercedes-Benz upped the ante considerably by creating a 6-litre, 300 kW engine.

The M120 family was built in Stuttgart, Germany. It has an aluminium engine block lined with silicon/aluminium. The aluminium DOHC cylinder heads are 4 valves per cylinder designs. It uses sequential fuel injection (SFI) and features forged steel connecting rods.

The M120 was eventually replaced by the smaller (5.8 litres), lesser-powered, short-lived, SOHC, three valves per cylinder M137 V12 engine. Mercedes ceased production of the M120 because of new emission rules.

E60
This engine developed 394-408 PS and 420–428 lbft of torque for the 6.0 L version. In 1992 only, the M120 engine was offered in North America in 402 hp format and from 1991-92 408 PS in Europe. All other years (1993–1999) have the 394 PS version.

Applications:
 * 1991–1998 600 SE / 600 SEL / S 600 (W140)
 * 1992–1999 600 SEC / S 600 Coupé / CL 600 (C140)
 * 1992–2001 600 SL / SL 600 (R129)
 * 2004 Chrysler ME-412
 * 2014–2022 Hongqi L5
 * 1993 (1995?) Isdera Commendatore 112i
 * 2005 Laraki Borac
 * 2003 Laraki Fulgura
 * 2000 Lotec Sirius (with twin-turbo version of M120 engine)
 * 1996–1999 Mega Monte Carlo
 * 1992–2000 Mega Track

E70 AMG
A 7.1 L (7,055 cc) version was also used in the SL 70 AMG, S 70 AMG and CL 70 AMG, and produced 496 PS (365 kW). Another 7.1 L (7,055 cc) version with 510 PS (380 kW; 500 hp) was used for SL 72 AMG, S 72 AMG and CL 72 AMG cars.

E73 AMG
There was also a 7.3 L version producing 525 PS developed by AMG which was also used in the SL 73 AMG, S 73 AMG and CL 73 AMG. The 7.3 L M120 engine was also featured in the AMG-built, S 73 T Kombi, a custom-built W140 S-Class wagon for the Sultan of Brunei. Eighteen units were produced, ten of which went to the Sultan.

M297
In 1997, the FIA GT Championship race car Mercedes-Benz CLK GTR was fitted with the M297 engine, derived from the M120. The 25 road cars, required by the FIA rules and delivered in 1999, had their engine enlarged to 6.9 L.

Pagani Zonda
The Pagani Zonda has used three different capacities of Mercedes-AMG tuned versions of the M120 engine, starting with the untuned 6.0 L for the original Zonda C12 to a 7.0 L version for the C12-S and Zonda GR, then to the 7.3 L for the Zonda S 7.3/Zonda Roadster, and back to the 6.0 L for the Zonda R and the Zonda Revolución. The bore and stroke of the 7.3 L version is 91.5x92.4 mm.

Applications: