Engine 642862 Mercedes W221 S 350 BlueTEC Complete Engine 642.862 OM642 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.

Engine 642862 Mercedes W221 S 350 BlueTEC Complete Engine 642.862 OM642 WARRANTY is an original powertrain unit from the V6 family, designed for Mercedes vehicles with a BlueTEC diesel engine. This is a proposal for users who are looking for a proven, used engine with stable operating parameters and want to restore the full efficiency of the drivetrain without investing in a brand-new unit.

Specifications and technical data

• SKU: A6420103945-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420103945
• Substitutable numbers: A6420103945, A 642 010 39 45
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Mileage: 124 900

Technical characteristics of the powertrain unit

The presented engine belongs to the Engines category and represents a modern diesel construction. The six-cylinder layout ensures smooth, refined operation and good flexibility across the entire rev range, which translates into the driving comfort typical of the luxury class. The V6 architecture used facilitates compact installation in the engine bay and favorable vehicle weight distribution.

The unit has been designed for efficient use of torque at low and medium engine speeds, which is particularly important in heavier F-segment limousines. The diesel engine with BlueTEC technology is optimized for fuel economy and stable operation over long highway mileages.

Purpose and application in the Mercedes W221 S 350 BlueTEC

The engine was factory-designed to work with the drivetrains of the S-Class W221 generation in the S 350 BlueTEC version. The appropriate torque characteristics and refinement are matched to the automatic transmissions used in this model, which facilitates smooth acceleration and comfortable driving in both city and highway modes.

The unit is suitable both as a replacement element in the event of a failure of the existing engine and in the case of a comprehensive drivetrain rebuild. Thanks to maintaining consistency with factory Mercedes solutions, the installation proceeds in a predictable manner for an experienced workshop, without the need for unusual structural modifications.

Condition, mileage, and benefits of choosing a used engine

The engine is offered as used, with documented mileage recorded in the technical specification. Such a choice allows for a significant reduction in repair costs compared to purchasing a brand-new unit, while maintaining the manufacturer's original design. For many Mercedes W221 users, this is a reasonable compromise between budget and expected durability.

A used V6 diesel engine can be particularly attractive in situations where the existing unit has suffered serious mechanical damage or would require a costly rebuild. Using a complete, verified unit shortens vehicle downtime and simplifies the service process.

To better understand the advantages of purchasing a used powertrain unit, it is worth reading an expert guide discussing the facts and myths regarding such solutions – detailed information can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths.

Why choose an original Mercedes engine

The original engine from the BlueTEC family ensures consistency with factory electronics, the fuel injection system, and driver assistance systems. As a result, predictable operating characteristics are maintained, and computer diagnostics are based on parameters provided by the manufacturer. This is important both for workshops specializing in the brand and for users expecting operational stability.

Key advantages of such a unit include, among others:

• compatibility with factory systems of the Mercedes S-Class vehicle,
• consistency with original engine control unit maps,
• preservation of the operating character typical of the S 350 BlueTEC version,
• possibility of further service maintenance based on standard manufacturer procedures.

Expansion and other Mercedes Engines

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.