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

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

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

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

Mercedes W251 R320 R350 CDI 4 Matic Bare Engine 642950 642.950 99k, WARRANTY is a used, complete engine block with cylinder heads, sold without accessories, designed for R-Class models with 4Matic all-wheel drive. This solution is intended for users who expect factory compatibility, the preservation of the V6 unit's characteristics, and the possibility of professional drivetrain repair based on the original design. Thanks to the retention of the stock engine architecture, it serves as a solid base for the reinstallation of accessories and drivetrain components.

Specifications and technical data

• SKU: A6420108597
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420108597
• Substitutable numbers: A6420108597, A 642 010 85 97, A6420103502, A 642 010 35 02
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Engine code: 642950
• Mileage: 59 000

Technical characteristics of the unit

The offered bare engine belongs to the Engines category and is intended for Mercedes vehicles from the W251 R320 and R350 CDI 4Matic family. The design is based on a V6 layout, fueled by Diesel, which ensures the flexibility and high torque at low and medium RPMs characteristic of this series.

The bare engine version means it serves as a base for transferring accessories from the previous unit – a solution preferred by professional workshops that want to maintain the original configuration of accessories, wiring harnesses, and control units. This form allows for precise matching to the specific vehicle configuration without the need for installation modifications.

Purpose and application in the Mercedes W251

The Mercedes W251 R320 R350 CDI 4 Matic Bare Engine 642950 642.950 99k, WARRANTY is dedicated for use in Mercedes R-Class models with 4Matic drive, where compliance with the factory drivetrain is required. The unit maintains the correct geometry of the mounts, crankshaft system, and cylinder heads, which facilitates installation in place of a damaged engine without interfering with the body structure or subframe.

Due to the nature of the V6 diesel unit, the bare engine will perform well both in cars used for long-distance travel and in mixed conditions, where stable operation, appropriate refinement, and the ability to handle loads typical of heavier family vehicles are important. This solution is particularly beneficial in cases of major failures, such as mechanical damage to the block or crankshaft system.

Condition, mileage, and benefits of choosing a used bare engine

The unit is used, which in practice represents an attractive compromise between repair costs and maintaining the manufacturer's original specifications. The declared engine mileage is relatively low for this class of diesel units, which translates into a potentially greater durability margin with proper installation and further operation.

Choosing a used OEM bare engine allows you to:

• maintain the factory operating characteristics of the powertrain,
• reduce costs compared to purchasing a new engine,
• avoid problems with fitting replacements of uncertain specifications,
• carry out repairs in a way that is predictable for the electronics and the 4Matic drivetrain.

For users who want to better understand the differences between new and used powertrain components, the expert guide Why it is worth buying used gearboxes and engines – facts instead of myths, which describes, among other things, selection by OEM numbers and real cost proportions, will be helpful.

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 ensure the proper transfer of accessories, inspection of the lubrication and cooling systems, and verification of tightness. It is also crucial to match the engine by the unit code and data from the vehicle documentation, which minimizes the risk of incompatibility with the existing engine control unit and all-wheel drive system.

When choosing a used bare engine, it is worth being guided not only by price but also by origin and compliance with factory specifications. Additional arguments are provided by the guide on the advantages of original parts, available at the link 5 reasons why a used OEM part is a better choice than a replacement, where practical selection criteria are discussed without the need for modifications.

Expanding repairs within the drivetrain

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 additional bare engines, blocks, or complete units, check the available parts in the Mercedes Engines category.

This approach allows you to plan the entire service operation in a consistent manner – from selecting the right bare engine, through the potential replacement of other powertrain units, to optimizing costs and vehicle downtime.