BMW E81 E87 E90 E91 E92 LCI Steering Fluid Tank Bottle Reservoir 6851218

BMW E81 E87 E90 E91 E92 LCI Steering Fluid Tank Bottle Reservoir is an original BMW steering system component designed for 1 Series and 3 Series E-generation models. This used reservoir allows for an economical yet professional repair of the power steering system, maintaining factory fitment and performance parameters. It is a practical solution for workshops and users who expect a proven part at a reasonable price.

Specifications and technical data

• SKU: 6851218-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6851218
• Substitutable numbers: 32416768094, 6768094, 32416851218, 6851218
• Part type: Power Steering Pump
• Category: Power Steering Pumps

Purpose and function in the power steering system

The presented reservoir is responsible for storing fluid in the power steering system, ensuring a stable level and proper venting. In BMW E81, E87, E90, E91, and E92 LCI vehicles, it is a component structurally matched to the hydraulic system, which translates into proper fluid circulation and correct operation of the power steering pump.

By using an original component, compatibility with factory hoses, mounts, and the operating characteristics of the entire system is maintained. A properly selected reservoir helps reduce the risk of air locks, uneven steering assistance, or excessive pump wear.

Benefits of using an original BMW reservoir

Using an original power steering fluid reservoir in BMW E81–E92 LCI models offers a number of practical advantages:

• factory fitment to the steering system of the specific model,
• maintenance of the manufacturer-specified reservoir operating capacity,
• proper hose routing and stable mounting in the engine bay,
• reduced risk of leaks resulting from non-fitting aftermarket replacements,
• easier diagnostics and servicing of the power steering system in the future.

For workshops and users, this means more predictable installation and a lower risk of operational problems after replacement. Choosing an original element from the Power steering pumps and accessories category also facilitates easier part identification in service documentation later on.

Condition, origin, and service application

The offered reservoir comes from a dismantled BMW vehicle and is a used item, which allows for a significant reduction in repair costs while maintaining the original design. This type of part is suitable both for standard replacement of a worn or damaged reservoir and for comprehensive power steering system maintenance, including fluid replacement and inspection of hoses and the pump.

Thanks to the preservation of the factory shape and mounting points, installation proceeds in a manner similar to the manufacturer's procedure, without the need for modifications or the use of additional adapters. This is particularly important for vehicles used intensively, where repeatability and predictability of repairs are essential.

Selection by part numbers and technical support

The element features BMW manufacturer markings, which facilitates its identification and selection according to the specific engine version and vehicle year. In workshop practice, this allows for quick verification of part compatibility with a given car, as well as comparison with service documentation or online catalogs. If necessary, interchangeable numbers can be used to confirm compatibility within the same power steering system family.

For users seeking broader knowledge about the selection of hydraulic and fuel components, an article describing the principles of identifying parts by OEM and VIN numbers may be useful – you can find it here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. Although it mainly concerns the fuel system, it covers universal issues related to diagnostics and component selection based on manufacturer documentation.

Expanding power steering repairs in BMW

If you are planning a comprehensive repair or upgrade of the steering system area in your BMW and need other elements from the same group, such as pressure hoses, return lines, or complete pumps, check the available parts in the BMW Power steering pumps category.

This approach allows you to refresh key power steering components in a single service stage, which reduces the risk of subsequent leaks, pump noise, or a drop in steering efficiency under heavy loads. A well-chosen, original power steering fluid reservoir is an important element in this process, influencing the stability of the entire system.