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.
Caleb Morgan (verified owner) –
I’m extremely satisfied with the power and efficiency of this engine.
Gabriel Bailey (verified owner) –
My car now feels much more powerful with this engine installed.
Jonathan Phillips (verified owner) –
My vehicle now drives smoother than ever with this engine installed.
Christopher Harris (verified owner) –
The engine quality exceeded my expectations. It runs perfectly.
Jack Richardson (verified owner) –
The engine quality is outstanding. Everything fits perfectly and the performance has been excellent so far.
Luke Cox (verified owner) –
Excellent craftsmanship and performance. This engine exceeded my expectations.
Henry Rivera (verified owner) –
Great engine with solid build quality. Installation was straightforward and it performs flawlessly on the road.
Joshua Lewis (verified owner) –
Excellent power output and smooth operation from this engine.
Benjamin Parker (verified owner) –
The engine starts instantly and runs very quietly. I’m impressed with how reliable it feels.
Gabriel Bailey (verified owner) –
The engine quality is outstanding. Everything fits perfectly and the performance has been excellent so far.