Mercedes W164 W251 Engine Oil Sump Pan 3.0 CDI OM642 A6420100528

Mercedes W164 W251 Engine Oil Sump Pan 3.0 CDI OM642 is an original lubrication system component designed for the OM642 series diesel engines used in the M-Class W164 and R-Class W251 models. This used, factory-spec oil sump ensures proper collection and drainage of engine oil, which translates into stable engine operation and safe lubrication conditions. Choosing an original component from the Oil sumps category allows you to maintain the engine construction in accordance with the manufacturer's design.

Specifications and technical data

• SKU: A6420100528
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420100528
• Substitutable numbers: A6420100528, A 642 010 05 28
• Part type: Oil Sump
• Category: Oil Sumps

Purpose and technical function

The oil sump in the OM642 engine is responsible for storing oil, stabilizing its level, and properly supplying the oil pump during engine operation. In the case of Mercedes W164 and W251 models, this is of particular importance due to the torque characteristics of the 3.0 CDI engine and the typical operational loads of these vehicles. The original oil sump provides:

• a properly shaped working space for the oil at various body tilt angles,
• correct routing of drainage channels and contaminant discharge zones,
• precise fitment to the OM642 engine block and factory mounting points.

Benefits of using an original oil sump

Using a factory component in the 3.0 CDI lubrication system reduces the risk of leaks and problems with maintaining correct oil pressure. The sump design has been engineered for the specific operating conditions of the OM642 unit, which is significant during long-term operation and under load. Key advantages include:

• factory fitment to the engine – no need for modifications or adaptations,
• preservation of the original lubrication system geometry,
• consistency with factory solutions regarding oil drainage and ventilation.

Condition and installation aspects

The offered oil sump is a used component, which allows for economical repair while maintaining the original manufacturer's specifications. Before installation, standard preparatory steps are recommended, such as thorough cleaning of the mating surfaces, inspection of threads, and the use of new seals in accordance with service recommendations. In installation practice, it is worth paying attention to:

• even tightening of bolts according to the service procedure,
• leak testing after the first engine start,
• checking the oil level after a short test drive.

Application in the OM642 lubrication system

The 3.0 CDI OM642 engine used in Mercedes W164 and W251 models requires a stable lubrication system, especially during highway driving, towing trailers, or operation under full load. The oil sump dedicated to this engine supports the maintenance of the correct oil level and its circulation, which affects the durability of the bearings, turbocharger, and other cooperating components. Replacing a damaged or leaking sump with an original component is a recommended solution in situations such as:

• mechanical damage to the body (impact, local corrosion),
• problems with maintaining a seal at the junction with the engine block,
• post-accident repairs in the front part of the vehicle.

System expansion – Mercedes Oil Sumps

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 sumps, covers, or mounting elements, check out the available parts in the Mercedes Oil Sumps category. To better understand when it pays to reach for original used components instead of refurbished ones, it is worth reading the cost and durability analysis in the article: Manual transmission failures – why an original used part is sometimes a more sensible choice than regeneration.