BMW G11 G12 G20 G21 G30 G31 G32 B57 Water Coolant Pipe Hose 8573382

BMW G11 G12 G20 G21 G30 G31 G32 B57 Water Coolant Pipe Hose is an original cooling system component from the Oil coolers and hoses group, designed for BMW models with an automatic transmission. This used OEM component ensures proper coolant flow within the B57 engine, supporting stable operating temperatures for both the engine and the oil.

Specifications and technical data

• SKU: 8573382
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8573382
• Substitutable numbers: 8573382, 11538573382
• Gearbox type: Automatic
• Category: Engine Oil Coolers & Lines

Purpose and function of the coolant hose in the cooling system

The presented water hose operates within the cooling system of the B57 diesel engine, used in the BMW G11, G12, G20, G21, G30, G31, and G32 series. Its task is to direct the flow of coolant between components interacting with the oil cooler and the engine block, in order to maintain stable thermal conditions during city driving, highway driving, and under higher loads.

Thanks to its factory geometry and properly selected inner diameter, the hose ensures correct medium flow, reduces the risk of localized overheating, and supports even heat dissipation from the engine. This is particularly important in modern BMW engines, where the cooling system works in conjunction with advanced control electronics and an automatic transmission.

Compatibility with automatic transmission

The component has been designed for vehicles equipped with an automatic transmission, where the cooling system must handle both the engine and the components that work with it. Proper coolant routing influences the stability of engine oil temperature and, indirectly, the operating conditions of the automatic transmission.

Proper fitment of the hose to factory mounting points facilitates installation and allows for maintaining the original routing of the cooling system. This minimizes the risk of collision with other engine bay components and unwanted stresses that could shorten the hose's service life.

Advantages of using an original BMW hose

Using an original BMW water hose within the Oil coolers and hoses system allows for maintaining factory flow and sealing parameters. In practice, this means:

• a secure fit for the B57 engine and G11, G12, G20, G21, G30, G31, G32 series bodies,
• preservation of the original coolant routing path,
• reduction of the risk of leaks resulting from incorrect shape or length of a replacement part,
• consistency with other cooling system and oil cooler components.

The used OEM component is a sensible choice for users who want to maintain proper cooling system operation at controlled service costs, without sacrificing factory technical specifications.

Condition, verification, and service application

The hose comes from disassembly and is offered as a used part, which allows for economical repair or replacement of a damaged section of the cooling system. This type of component is particularly useful in cases of:

• mechanical damage to hoses (cracks, abrasions, deformations),
• cooling system leaks in the area of the oil cooler,
• preventive maintenance in vehicles operated under higher thermal loads.

Thanks to its original design, the hose can be used as a direct replacement for the factory component, without the need to modify other cooling system parts.

Technical support and additional materials

To better understand the impact of a functional water hose and oil cooler on engine durability, it is worth checking out the guide on cooling system diagnostics and service: Engine cooling system – overheating, repair, and used radiators. The article discusses, among other things, the consequences of overheating and the importance of proper coolant flow in modern designs.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as oil lines, water pipes, or additional cooling system sections, check out the available parts in the BMW oil coolers and hoses category.