Mercedes W251 R320 R350 CDI 4 Matic Complete Engine 642950 642.950 99k, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

Mercedes W251 R320 R350 CDI 4 Matic Complete Engine 642950 642.950 99k, WARRANTY is a complete powertrain unit from the V6 diesel family, designed for R-Class models with 4Matic all-wheel drive. This is a solution for users expecting a proven diesel design that maintains the factory operating characteristics and compatibility with the vehicle's original systems. Thanks to the completeness of the accessories, the engine serves as a practical base for a professional replacement in a specialized workshop.

Specifications and technical data

• SKU: A6420108597-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420108597
• Substitutable numbers: A6420108597, A 642 010 85 97
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Engine code: 642950
• Mileage: 59 000

Technical characteristics of the unit

The presented engine belongs to the Engines category and represents a modern diesel construction developed by Mercedes for premium class vehicles. The six-cylinder configuration ensures smooth operation, good balance, and an adequate torque reserve, which is particularly important in heavier models such as the Mercedes W251 in R320 and R350 CDI 4Matic versions.

The engine code points to the V6 CDI family of units, widely used in the Mercedes range, which facilitates the selection of service parts and integration with the vehicle's factory electronics. The use of diesel fuel allows for favorable fuel consumption while maintaining appropriate dynamics, as well as seamless cooperation with the automatic transmissions used in these models.

Purpose and compatibility

The engine was designed for use in the Mercedes R-Class W251 generation, in R320 and R350 CDI versions with 4Matic drive. This means that its geometry, mounting points, and accessory layout are adapted to the engine bay and drivetrain of these specific models. In practice, this translates into:

• maintaining the factory mounting system and engine mounts,
• proper cooperation with the 4Matic drive,
• the possibility of integration with the original engine control unit and the vehicle's electrical installation.

Thanks to this, the unit provides a solid base for replacing a damaged engine in the vehicle without the need for structural modifications.

Benefits of choosing a complete used engine

Purchasing a complete, used engine from the V6 CDI family is a solution that allows for significant cost savings compared to rebuilding or purchasing a new unit. In the case of this construction, the following are particularly important:

• component consistency – the accessories come from a single unit, which minimizes the risk of fitment issues,
• original origin – the factory Mercedes specification is preserved,
• the ability to assess the condition based on mileage history and workshop inspection.

A used engine with a preserved, moderate mileage is often chosen by workshops specializing in the Mercedes brand as a reasonable compromise between cost and durability. Additionally, utilizing an existing powertrain unit aligns with an approach that reduces resource consumption and the amount of workshop waste.

Professional installation and selection based on technical data

To fully utilize the potential of this unit, installation in a specialized service center is recommended, which will verify the compatibility of the engine code, accessory configuration, and ECU software with the specific vehicle. Proper selection based on technical data and vehicle identifiers helps avoid problems with starting, errors in onboard systems, or improper operation of the 4Matic drive.

If you want to better understand how to safely choose used powertrain units and what selection procedures based on identification numbers are used by professionals, check out the expert guide Why it is worth buying used transmissions and engines – facts instead of myths, which discusses, among other things, the practical aspects of purchasing used engines.

Expanding the scope of work within the drivetrain

Replacing the powertrain unit is a good time to comprehensively address the condition of the entire engine system in the vehicle. If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as manifolds, accessory parts, or additional mounting components, check the available parts in the Mercedes Engines category.