Mercedes-Benz M103 2.6L Inline-6 Petrol Engine

Description

For sale is a used Mercedes-Benz M103 2.6L inline-6 petrol engine, a well-known and reliable powerplant used in several classic Mercedes models. This engine was removed from a donor vehicle and inspected prior to listing. It remains in good used condition, showing only normal wear consistent with age and proper maintenance. The engine is supplied as a long block and is suitable for direct replacement, restoration projects, or rebuild preparation.
The M103 2.6L engine is appreciated for its smooth operation, strong mid-range torque, and durable construction. It offers refined performance while maintaining the traditional engineering standards associated with Mercedes-Benz straight-six engines. This unit is ideal for owners looking to restore factory driving characteristics or preserve originality in a classic Mercedes vehicle.

Performance & Reliability

The M103 engine features a single overhead camshaft, 12-valve cylinder head, cast-iron block, and aluminum cylinder head, combined with Bosch KE-Jetronic fuel injection for consistent fuel delivery. Prior to removal, the engine ran normally with no abnormal noise or visible smoke. During inspection, the following checks were carried out:
Engine rotates freely
Compression remains even across cylinders
No visible cracks in block or head
Oil galleries and mounting points intact
The M103 is recognized for its long service life when properly maintained. Its simple mechanical design allows for straightforward servicing and parts availability. This engine integrates directly with factory cooling, exhaust, and transmission systems when installed in its original applications.
This unit is suitable for stock restorations, daily driver replacements, or classic Mercedes rebuild projects. It can also serve as a strong foundation for preventative maintenance or mild performance refresh.

Fitment

Fits in:
Mercedes-Benz W124 260E
Mercedes-Benz W201 190E 2.6
Mercedes-Benz W126 260SE
Other models originally equipped with the M103 2.6L engine
This is a direct-fit engine for the above applications when installed with correct accessories and wiring. No modification is required when replacing an original M103 2.6L engine. Buyers should confirm engine code and vehicle compatibility before purchase.

Warranty & Installation

This engine includes a 6-month limited mechanical warranty, covering internal engine components under normal operating conditions. External accessories, sensors, gaskets, and wear items are not covered due to prior use.
Professional installation is strongly recommended. During installation, it is advised to:
Replace engine oil, coolant, and filters
Inspect timing components and seals
Check fuel injection and ignition connections
Perform initial test run before regular operation
Proper installation and service help ensure reliable operation and long-term performance.

If you are searching for a genuine Mercedes-Benz M103 2.6L inline-6 petrol engine, this used unit offers dependable performance, correct fitment, and strong value for classic Mercedes ownership. It is an excellent solution for replacing a worn engine while maintaining original factory specifications. With proven engineering and solid condition, this engine is ready to return your vehicle to smooth and reliable operation.