Mercedes W166 OM642 Diesel Engine Oil Sump Pan Automatic A6420145302

Mercedes W166 OM642 Diesel Engine Oil Sump Pan Automatic is an original lubrication system component designed for OM642 diesel engines paired with an automatic transmission. This used, fully functional oil sump ensures proper collection and return of engine oil, which translates into stable lubrication pressure and safe operation of the power unit. Choosing an original Mercedes part guarantees precise structural fitment and compliance with the manufacturer's factory requirements.

Specifications and technical data

• SKU: A6420145302
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420145302
• Substitutable numbers: A6420145302, A 642 014 53 02, A6420142300, A 642 014 23 00
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Oil Sumps

Purpose and role in the lubrication system

The oil sump in the OM642 engine is responsible for storing operating oil, its intake by the pump, and draining impurities to the filter. In the version dedicated to the automatic transmission, the body geometry is matched to the transmission housing, which minimizes the risk of collision with other components and facilitates installation in the engine bay.

A properly selected oil sump reduces oil foaming, stabilizes its level during acceleration and braking, and supports maintaining the appropriate operating temperature. This is particularly important in modern diesel engines, where the lubrication system operates under high thermal and mechanical loads.

Benefits of using an original Mercedes oil sump

Using an original oil sump in a Mercedes W166 with an OM642 engine and automatic transmission provides a number of practical benefits:

• factory fitment to the engine block and automatic transmission housing,
• preservation of the oil system capacity designed by the manufacturer,
• correct routing of drain channels and accessory mounting points,
• reduced risk of leaks compared to replacements with imprecise dimensions.

Thanks to this, it is possible to maintain stable operating conditions for the diesel engine, which has a direct impact on the durability of the bearings, turbocharger, and other components lubricated by oil.

Selection for the OM642 Diesel engine and automatic transmission

The presented oil sump has been designed specifically for OM642 diesel units paired with an automatic transmission. This means that the shape of the body, the arrangement of mounting holes, and the attachment points are optimized for this powertrain configuration.

When selecting the part, it is worth paying attention to:

• compatibility with the fuel type (Diesel),
• intended use for automatic transmission,
• original origin from the Mercedes group.

Such an approach limits the risk of installation problems, collisions with the subframe or exhaust, and leaks at the interface with the engine block.

Condition, installation, and service recommendations

The oil sump is a used original component, which in practice means the preservation of factory geometry and mounting points. Before installation, it is recommended to thoroughly clean the mating surfaces, check the threads of the mounting bolts, and use a new gasket or an appropriate sealant in accordance with the manufacturer's recommendations.

During replacement, it is also worth:

• checking the condition of the oil pickup and seals,
• assessing any potential signs of previous leaks,
• performing an oil and filter change to fully utilize the potential of the newly installed sump.

Service performed in this way allows for restoring safe engine lubrication conditions and reducing the risk of costly failures in the future.

Expanding engine area support in your Mercedes

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, drain plugs, or mounting elements, check the available parts in the Mercedes oil sumps category.

To better plan service work on systems cooperating with the engine, it is also worth familiarizing yourself with the topic of accessory diagnostics – you will find practical tips in the article Air conditioning compressor – symptoms of failure, causes, and safe replacement, which helps to assess the condition of key components and consciously choose used parts.