1997 Mercedes-Benz M120 6.0L V12 Powertrain Engine, Transmission & ECUs (45k Miles)

For sale is a Mercedes-Benz M120 6.0L naturally aspirated V12 powertrain, complete with engine, transmission, and ECUs, sourced from a low-mileage 1995 SL600 (R129). With only 45,000 original miles and excellent compression across all cylinders, this is one of the cleanest, most desirable M120 powerplants available today.

The M120 V12 is one of Mercedes-Benz’s most iconic engines — a hand-assembled, all-aluminum 6.0-liter powerhouse with smooth, effortless power delivery. Known for its bulletproof reliability and incredible tuning potential, it has powered everything from the luxurious S600 and SL600 to rare AMG and Brabus supercars, as well as inspiring the legendary Pagani Zonda.

Powertrain Package Includes

• Mercedes-Benz M120 6.0L V12 Engine (naturally aspirated)

• Automatic Transmission (matching low mileage)

• Original Engine Control Units (ECUs) for proper integration

• Complete Wiring Harness for easier installation (if included – confirm contents)

• All components tested with excellent compression results

Key Features & Highlights

• Genuine Mercedes-Benz M120 6.0L V12 – legendary pre-merger engine.

• Low mileage – only 45,000 miles.

• Excellent compression – strong, healthy motor ready for installation.

• Includes transmission and ECUs – a full swap-ready powertrain.

• Ideal for restoration, engine swaps, or AMG/Brabus builds.

• Fits 1990s Mercedes S-Class (W140), SL-Class (R129), and other compatible models.

Why Enthusiasts Want the M120 V12

Search demand is high for:

• Mercedes M120 engine for sale

• SL600 M120 V12 swap kit

• W140 S600 engine and transmission

• AMG/Brabus M120 7.3 builds

• Pagani Zonda Mercedes V12 engine

The M120 is not just any Mercedes engine — it represents peak 1990s Mercedes engineering, with smoothness, durability, and tuning potential that still impresses today. Performance tuners, collectors, and Pagani enthusiasts alike regard it as one of the greatest naturally aspirated V12s ever made.

Perfect For

• Mercedes restorers seeking an original low-mileage M120.

• Engine swap projects (W124, R129, W140, or custom builds).

• Collectors looking for an investment-grade Mercedes powertrain.

• Performance tuners aiming for AMG/Brabus or Pagani-style projects.

Finding a complete Mercedes M120 V12 engine and transmission package with only 45k miles is nearly impossible today. This powertrain is ready for installation, restoration, or custom builds, with excellent compression and all necessary electronics included.

 Secure this 1997 Mercedes-Benz M120 6.0L V12 Powertrain (Engine + Transmission + ECUs, 45k Miles) today and own a piece of Mercedes performance history.