Engine 651940 Mercedes W639 Vito Viano Complete Engine OM651 651.940 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 651940 Mercedes W639 Vito Viano Complete Engine OM651 is a factory-spec, four-cylinder diesel engine designed for the demanding requirements of the Vito model. This unit belongs to the modern OM651 family, highly regarded for its efficient combustion, smooth operation, and robust construction. It is an ideal choice for users seeking a proven solution for professional use in a Mercedes commercial vehicle.

Specifications and technical data

• SKU: A6510108204-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510108204
• Substitutable numbers: A6510108204, A 651 010 82 04, A6510105202, A 651 010 52 02, A6510106002, A 651 010 60 02
• Fuel type: Diesel
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Technical characteristics of the OM651 unit

The engine from the OM651 family used in the Mercedes Vito W639 is a modern diesel design based on four cylinders in an inline configuration. The use of Diesel fuel provides a favorable compromise between dynamics and fuel consumption, which is particularly important in delivery and fleet vehicles. The unit was developed with long-term operation, stable performance under load, and excellent compatibility with both manual and automatic transmissions used in the Vito in mind.

The OM651 family is widely documented in Mercedes service manuals and is known in the industry as a design optimized for exhaust emissions and component durability. As a result, the engine performs well both in city traffic and on the highway, at constant speeds and under higher loads.

Purpose and application in the Mercedes Vito W639

Engines from this series are dedicated to commercial models where parameter repeatability, predictable behavior under load, and the capability for intensive operation are essential. In the Mercedes Vito W639, the OM651 651.940 unit is responsible for:

• efficient torque delivery across the entire rev range,
• stable operation during frequent starts and short trips,
• maintaining economical fuel consumption while preserving adequate dynamics.

The engine fits well with the needs of transport, service, and craft companies, where the vehicle is a work tool and the reliability of the powertrain has a direct impact on business continuity.

Condition, mileage, and benefits of installation

The offered unit comes from the secondary market, which allows for the optimization of repair costs compared to purchasing a brand-new engine. The declared mileage is relatively low for a commercial vehicle application, which translates into potential for further operation provided that proper service maintenance is followed. For workshops and end-users, this means the ability to restore full vehicle functionality within a reasonable budget.

Replacing the powertrain with a proven OM651 engine in a Vito W639 is a solution that can be beneficial in the event of a serious failure of the existing motor, mechanical damage to the block or cylinder head, or when a general overhaul is not cost-effective. A properly selected engine helps reduce vehicle downtime and limits the risk of additional complications during repair.

What to consider during selection and installation

Before installation, it is recommended to verify the compatibility of the unit with the specific vehicle equipment version, model year, and transmission used. It is also important to check the auxiliary equipment that will be transferred from the old engine or replaced with new parts to avoid incompatibility and additional service downtime. Professional installation in a specialized workshop allows for maintaining the operating parameters specified by the manufacturer and minimizes the risk of subsequent leaks or installation errors.

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 power units, check the available parts in the Mercedes Engines category.

Technical support and additional information

When choosing a used power unit, it is worth knowing the typical design problems of modern engines and their impact on operating costs. Comparative material regarding problematic units in other brands may be helpful – a good point of reference is an article describing critical engines in a popular mid-size model, which you can find here: Troublesome BMW E90 engines – a practical guide to problematic units. It allows for a better understanding of how proper selection and servicing of an engine affect the user's budget.

For fleet users and workshops specializing in premium vehicles, an analysis of solutions used in other sports brands can be an additional source of knowledge about engine designs and powertrains. In this context, it is worth reading the comparative material regarding sports models, available at the link: Audi RS vs other models – what is hidden under the hood and chassis.