Power Steering BMW E46 E81 E87 Petrol Oil Carrier Tank Hose Reservoir 6851217

Power Steering BMW E46 E81 E87 Petrol Oil Carrier Tank Hose Reservoir is an original hydraulic system component designed for BMW models with petrol engines. It ensures stable fluid storage, which translates into proper power steering pump operation and predictable steering system performance. Thanks to its factory design, the reservoir is precisely fitted to the engine bay and installation requirements of these BMW generations.

Specifications and technical data

• SKU: 6851217-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6851217
• Substitutable numbers: 32416851217, 6851217, 32416781744, 6781744, 32416754498, 6754498
• Fuel type: Petrol
• Category: Power Steering Pump Parts

Purpose and function in the power steering system

The presented power steering fluid reservoir has been designed as a component of the hydraulic system in BMW E46, E81, and E87 series cars powered by petrol engines. Its task is to maintain the correct amount of fluid, stabilize pressure, and limit the aeration of the working medium, which has a direct impact on the smoothness and precision of the steering system.

A properly selected reservoir minimizes the risk of cavitation in the power steering pump, reduces operating noise, and helps maintain the correct lubrication and cooling parameters for hydraulic components. This is particularly important in urban driving, where the power steering system works intensively during frequent maneuvers and parking.

Construction and fitment for BMW

As an element from the Power steering pump parts group, the reservoir has been constructed to work with factory hoses, mounts, and pumps used in the mentioned BMW generations. This means maintaining the original geometry of the ports, mounting points, and venting system, which facilitates installation and limits the need for any modifications.

The original origin of the component translates into consistency with the factory hydraulic system design – both in terms of fluid flow and resistance to temperature and vibrations occurring in the engine bay. As a result, the reservoir is a safe service solution when replacing worn or leaking parts.

Condition, service application, and benefits of installation

The offered reservoir is a used part, which makes it an attractive cost-effective alternative while maintaining the manufacturer's original specifications. This type of component is particularly recommended in situations where the existing reservoir shows signs of wear, such as leaks, housing cracks, damaged ports, or internal contamination affecting fluid quality.

Replacing the power steering fluid reservoir can help in:

• reducing fluid leaks around the pump and hoses,
• decreasing the risk of air entering the system,
• improving the operating culture of the power steering pump,
• maintaining stable, predictable steering resistance.

For BMW users who want to maintain consistency with the factory vehicle design, using an original reservoir is a more predictable solution than installing aftermarket parts with uncertain specifications.

Selection by numbers and OEM compatibility

The element has a dedicated OEM part number and associated interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration. Before purchasing, it is worth comparing the markings with service documentation or the removed part to ensure that the reservoir will be fully compatible with the given engine version and power steering system.

If you want to avoid mistakes when selecting used hydraulic components, use the practical expert tips described in the article No more bad purchases! How to professionally select used car parts, saving time and nerves. You will find information there on how to properly use OEM and reference numbers when choosing parts for your BMW.

Expanding the BMW power steering system

If you are planning a comprehensive repair or upgrade of the power steering area in your BMW and need other elements from the same group, such as pressure hoses, return hoses, or additional mounting elements, check the available parts in the BMW power steering pump parts category.