BMW 1 3 Series E81 E87 E90 Oil Carrier Steering Rack With Radiator Return Line

The BMW 1 and 3 Series E81, E87, E90 Steering Gear Oil Cooler Line with Return to Radiator is an original steering system component designed for BMW models with hydraulic power steering. This used OEM part ensures a factory fit, maintaining the correct geometry and oil flow within the system. It's a solution for users seeking a proven steering system component rather than unknown aftermarket alternatives.

Specifications and technical data

• SKU: 6851218
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6851218
• Substitutable numbers: 6851218, 32416851218, 32416768094, 6768094, 51459807427, 9807427
• Category: Other Interior Parts & Accessories

Purpose and Function in the Steering System

The oil cooler line with a return to the radiator is responsible for the stable circulation of oil in the power steering system between the steering gear and the oil cooler. A correctly selected component helps maintain proper operating pressure, reduce oil overheating, and preserve the precision of the steering rack's operation under typical road conditions.

In BMW 1 Series E81/E87 and 3 Series E90 models, the use of a dedicated oil line integrated with the return hose minimizes the risk of leaks, simplifies hose routing in the engine bay, and supports uniform cooling of the power steering oil.

Construction and Advantages of the Original BMW Component

The original BMW steering gear oil line has been designed for the specific body geometry of the 1 and 3 Series, ensuring that it:

• Provides proper routing of the return line to the oil cooler,
• Maintains adequate mounting stiffness within the steering gear assembly,
• Reduces vibrations and stresses in the hydraulic lines,
• Facilitates servicing and potential system bleeding.

Thanks to its factory design, compatibility with original brackets and mounting points in the BMW E81, E87, and E90 body is maintained, leading to predictable installation and no need for modifications.

Condition, Fitment, and Service Application

This part is a used component from a dismantled vehicle, offered for an economical repair of the power steering system while retaining an OEM part. It's a practical solution in situations such as:

• Mechanical damage to the line or return hose (e.g., after a collision or underbody impact),
• Corrosion or material fatigue leading to oil leaks,
• The need to restore the original configuration after previous modifications.

Before installation, a standard check of its tightness, condition of the connectors and mountings, as well as an oil change in the power steering system according to the BMW service procedure, are recommended to fully utilize the potential of the factory component.

Benefits of Choosing the Original Steering Gear Oil Line

Choosing the original steering gear oil line with a return to the radiator for BMW 1 and 3 Series E81/E87/E90 offers primarily:

• Certain fitment for the specific body generation and steering gear,
• Preservation of the power steering system's factory operating characteristics,
• Reduced risk of leaks resulting from incorrect hose geometry,
• Consistency with other BMW hydraulic system components.

For workshops and individual users, this translates to shorter installation times, predictable repair outcomes, and easier diagnosis of potential future faults.

Other Parts in the Category and Technical Materials

If you are looking for other parts in the Other BMW category for servicing or upgrading your steering and hydraulic system, check out our offer for other parts in the Other BMW category, where you will find a wide selection of original parts from dismantled vehicles.

To compare technical solutions used in sports models of other brands, including engine, brake, and chassis designs, it is worth reading the blog article Audi RS vs. Other Models – What Lies Under the Hood and Chassis?, which illustrates how manufacturers design key vehicle systems for performance and durability.

If you are interested in a broader use of dismantled components in car modernization projects, the guide Best Used Parts for Tuning Your Car, describing a practical approach to selecting used mechanical parts, may also be helpful.