Mercedes CL203 S203 W203 Petrol Engine Oil Sump Pan Top Upper Part R1120141402

Mercedes CL203 S203 W203 Petrol Engine Oil Sump Pan Top Upper Part is an original lubrication system component designed for petrol-powered engines. The upper part of the oil sump is responsible for the stable guidance of oil within the engine block, ensuring proper operating conditions for the crankshaft and piston system as well as correct lubrication across a wide range of loads.

Specifications and technical data

• SKU: A1120141402
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120141402
• Substitutable numbers: A1120141402, A 112 014 14 02, R1120141402, R 112 014 14 02
• Fuel type: Petrol
• Category: Oil Sumps

Purpose and function in a petrol engine

The presented upper oil sump part has been designed specifically for Mercedes petrol engines in the CL203, S203, and W203 body series. This component is an integral part of the lower engine block, creating a rigid, sealed base for the lubrication system. It is responsible for:

• maintaining the appropriate volume of operating oil in the lower engine area,
• stabilizing oil flow between the pump, lubrication channels, and the return to the reservoir,
• working in conjunction with the lower sump part and seals to reduce the risk of leaks.

Thanks to its precise geometry and fitment for the specific engine unit, the upper oil sump supports uniform lubrication of moving parts, which translates into smoother engine operation and reduced mechanical wear.

Construction, fitment, and mounting parameters

As an item in the Oil sumps category, this upper part has been manufactured to factory standards, maintaining appropriate rigidity and precise mating surfaces. The design provides:

• factory mounting points to the engine block,
• compatibility with the original oil pump and lower sump,
• channels and spaces that guide oil in a controlled manner.

Such a solution facilitates installation for mechanics and reduces the risk of leaks when appropriate seals and tightening torques are applied correctly. The original origin of the component helps maintain factory tolerances and compatibility with engine accessories.

Characteristics of the used component

The offered upper oil sump is a used part, which in practice means it has been removed from a vehicle and may show signs of wear typical for this type of component. At the same time, it retains full structural functionality, allowing for continued operation in the lubrication system after proper installation.

Choosing a used OEM part is often a beneficial solution for Mercedes petrol engine repairs, as it allows for the preservation of original geometry and material quality at reasonable service costs. This is particularly important for structural components that must perfectly interface with the engine block and other sub-assemblies.

Benefits of using an original oil sump

Using an upper oil sump part sourced from Mercedes provides a number of practical benefits:

• Factory fitment – no need for modifications, drilling, or adjusting mounting holes.
• Consistency with the lubrication system – maintaining the oil circulation and pump interaction intended by the manufacturer.
• Engine stability – proper oil guidance reduces the risk of the pump sucking in air during dynamic driving.
• Seamless integration with accessories – compatibility with original mounting and sealing elements.

For workshops and private users, this means faster installation, a lower risk of issues after starting the engine, and predictable engine behavior in daily operation.

Selection support and additional information

When selecting an upper oil sump for a specific petrol engine version, it is worth verifying compatibility with the engine code and vehicle model year. Part identification data, such as the OEM number or replacement numbers, are also helpful, allowing for precise confirmation of compatibility with a given Mercedes vehicle.

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 other sump variants, covers, or mounting elements, check the available parts in the Mercedes Oil sumps category.

For drivers interested in the characteristics of drivetrains used in vehicles of this brand and the impact of individual components on drivetrain durability, an article discussing various AWD solutions may be helpful – you can find it here: comparison of xDrive, 4Matic, quattro, and 4Motion drives.