Oil Pan Mercedes S-Class W221 OM642 Diesel Engine Oil Sump Pan A6420100628

Oil Pan Mercedes S-Class W221 OM642 Diesel Engine Oil Sump Pan is a precisely engineered lubrication system component, dedicated to the OM642 series diesel engines in the W221 generation S-Class model. This used, original oil pan ensures stable operating conditions for the diesel engine, supporting its durability as well as the safe drainage and storage of engine oil.

Specifications and technical data

• SKU: A6420100628
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420100628
• Substitutable numbers: A6420100628, A 642 010 06 28, KZ
• Fuel type: Diesel
• Category: Oil Sumps

Purpose and function in the lubrication system

The oil pan in a diesel engine is responsible for collecting oil, ensuring its smooth return from the upper parts of the unit, and providing a stable supply to the oil pump. In the case of the OM642 design in the Mercedes W221, this is of particular importance due to the high thermal and mechanical loads typical of modern diesel engines.

A properly selected oil pan helps to reduce oil foaming, maintain the correct lubrication level at various rotational speeds, and supports proper cooling of moving parts. Using the correct component translates into:

• stable oil pressure across the entire engine operating range,
• reduced risk of seizing of mating components,
• more predictable operating conditions for the powertrain under load.

Compatibility with the OM642 unit and Diesel fuel

The presented oil pan has been designed with the specifics of the OM642 engine in mind, which is Mercedes' six-cylinder diesel unit. The lubrication system design in this engine requires the appropriate shape of the sump, correct routing of oil return channels, and compatibility with the auxiliary equipment characteristic of Diesel-powered versions.

As a result, the component maintains the correct geometry relative to the engine block, ensures compatibility with the factory mounting system, and works with the manufacturer's original solutions for oil drainage and filtration. This is important both during standard operation and after high mileage, when the lubrication system must remain as stable as possible.

Performance characteristics and installation

As an item from the Oil pans category, this oil pan for the Mercedes W221 has been prepared for the service replacement of a damaged or leaking sump. The used component allows for an economical repair while maintaining the original design of the lubrication system.

In practice, this means:

• retaining factory fitment to the engine block and auxiliary equipment,
• the ability to use standard seals intended for this unit,
• no need for modifications to the lubrication system when the part is correctly selected.

Before installation, a standard service procedure is recommended: thorough cleaning of the mating surfaces, checking for flatness, and the use of an appropriate gasket or sealant in accordance with the vehicle manufacturer's recommendations. This approach helps to maintain system integrity and reduce the risk of oil leaks in the long term.

Why it is worth using an original Mercedes oil pan

Using an original component in a diesel engine's lubrication system has a direct impact on operational safety. Factory sump geometry ensures the correct position of the oil level relative to the pump pickup, which is crucial during dynamic driving, engine braking, or prolonged operation under load.

By choosing this oil pan, you gain:

• compliance with the design of the OM642 unit in the Mercedes W221,
• a solution tailored to the operating characteristics of a diesel engine,
• the ability to restore proper lubrication system operation after damage or corrosion of the previous sump.

This is a sensible choice for service repairs when the priority is to maintain engine performance parameters close to factory specifications and to limit the risk of problems resulting from ill-fitting aftermarket replacements.

Additional information and materials

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 additional sumps, mounting elements, or covers related to the lubrication system, check the available parts in the Mercedes oil pans category.

When selecting used components for service projects or modifications, it is also worth paying attention to common pitfalls associated with the secondary market. Practical tips on avoiding the most common mistakes when purchasing used components and planning modifications can be found in the article Buying used car parts – the most common mistakes when choosing tuning parts.