Mercedes W221 S 320 350 CDI Bare Engine 642930 642.930 with 119k miles, 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 W221 S 320 350 CDI Bare Engine 642930 642.930 with 119k miles, WARRANTY is an original V6 powertrain unit designed for S-Class diesel models. Thanks to its proven design and modern injection technology, it ensures stable operation, high driving refinement, and an adequate torque reserve. This is an ideal choice for users looking for a factory-fitted engine for advanced Mercedes luxury sedans.

Specifications and technical data

• SKU: A6420107502
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420107502
• Substitutable numbers: A6420107502, A 642 010 75 02, A6420108097, A 642 010 80 97
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Engine code: 642930
• Mileage: 59 000

Technical characteristics of the unit

The presented engine belongs to the Engines category and represents a modern V6 diesel design. The applied structural solutions promote smooth operation, vibration reduction, and efficient use of torque across the entire rev range. The unit has been designed for high-end vehicles, where smooth acceleration, flexibility, and acoustic comfort are paramount.

The cylinder configuration and the diesel fuel supply system allow for a favorable compromise between dynamics and fuel consumption. The engine is adapted to work with automatic transmissions used in the Mercedes S-Class, which translates into harmonious gear shifts and predictable throttle response.

Purpose and compatibility

The engine was developed for the Mercedes S-Class W221 generation models in 320 CDI and 350 CDI versions. This means full compatibility with the factory engine bay architecture, cooling system, electrical installation, and control systems. Using a unit with the correct engine code facilitates integration with the vehicle's electronics, including modules responsible for powertrain management and safety systems.

By maintaining the manufacturer's original specifications, it is possible to restore the vehicle's factory performance parameters without the need for structural modifications. This solution is particularly beneficial for professional repairs, where compliance with service documentation and predictable vehicle behavior after replacing the powertrain are essential.

Condition, mileage, and practical application

The offered engine is a used component, which allows for an economical powertrain restoration in premium class cars. The declared mileage of the unit is relatively low for this class of construction, which favors further operation with proper maintenance. This type of engine will work well both as a base for comprehensive regeneration and as a replacement for units with severe mechanical damage.

In practice, the installation of such a unit is often chosen by workshops specializing in the Mercedes brand, as it allows for shorter repair times compared to a full rebuild of a damaged engine. Maintaining the original architecture also facilitates subsequent computer diagnostics and service maintenance based on standard manufacturer procedures.

Benefits of choosing an original Mercedes engine

Choosing an original powertrain unit for a Mercedes S-Class translates into a number of practical benefits:

• factory fitment to the vehicle's mechanical and electrical installation,
• preservation of the operating characteristics intended by the manufacturer,
• easier integration with control systems and diagnostics,
• possibility of using existing service infrastructure.

Additionally, using an engine from the same design family helps maintain consistency in performance parameters, such as refinement, flexibility, and power delivery characteristics, which is particularly important in luxury sedans. This is a solution that helps maintain the vehicle's utility value and reduces the risk of problems resulting from incompatible modifications.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as blocks, cylinder heads, or complete powertrain units, check the available parts in the Mercedes Engines category.

To better understand how choosing the right powertrain unit affects operating costs and failure risk, it is worth reading a practical guide on problematic engines in popular models – check out the article BMW E90 problematic engines: check what can ruin your budget!, which shows how important an informed decision is when choosing a used engine.