Water Hose BMW F10 F11 F13 535d 640d N57Z Coolant Cooling Pipe Line 8517079

The BMW F10 F11 F13 535d 640d N57Z Water Hose Pipe is an original cooling system component designed for precise coolant flow in N57Z engines. With factory-fitment for BMW 5 and 6 Series models, it ensures stable thermal operation of the powertrain and reduces the risk of leaks. A used OEM component is a sensible choice for drivers seeking a proven solution at an attractive price.

Specifications and technical data

• SKU: 8517079
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8517079
• Substitutable numbers: 8517079, 17128517079
• Category: Coolant Hoses

Function in the BMW N57Z Engine Cooling System

The water hose, part of the Cooling System Hoses and Pipes category, is responsible for the controlled flow of coolant between key engine and accessory components. In a properly configured cooling system:

• it maintains the stable operating temperature of the N57Z diesel engine,
• it limits localized overheating of aluminum and plastic components,
• it supports efficient heat dissipation under heavy engine load,
• it minimizes the risk of pressure drops in the cooling circuit.

Thanks to its construction adhering to factory BMW standards, the hose maintains the correct routing geometry within the engine bay, facilitating installation and servicing.

Compatibility with BMW F10, F11, F13 535d and 640d

The offered water hose is designed for use in modern BMW diesel engines found in the 5 Series (F10, F11) and 6 Series (F13) in the 535d and 640d versions with the N57Z engine. Using an original BMW solution allows for:

• maintaining factory hose routing in the engine bay,
• ensuring compatibility with stock cooling system spigots and connectors,
• reducing stress caused by engine vibrations,
• minimizing the risk of collision with other accessory components.

This is particularly important in the powerful 535d and 640d versions, where the cooling system operates under higher thermal load.

Benefits of Using an Original BMW Hose

Using an original BMW water hose instead of a worn-out or aftermarket replacement offers tangible operational benefits:

• Factory Fitment – compliance with the geometry and spigot diameters of the N57Z engine.
• Cooling System Stability – reduced risk of micro-leaks and pressure drops.
• Hassle-Free Installation – the hose is designed for direct replacement in dedicated BMW models.
• Engine Thermal Safety – proper coolant flow under heavy loads and high ambient temperatures.

A used OEM part is a good solution for users who want to restore the cooling system's functionality while maintaining the original manufacturer's design.

Condition and Service Application

The water hose comes from the BMW offering and is classified as a used part, allowing for economical repair while maintaining original specifications. It is suitable for both standard replacement of worn hoses and for larger servicing tasks related to the cooling system in N57Z engines.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as additional water pipes, flexible return hoses, or radiator fluid supply pipes, check the available parts in the BMW Cooling System Hoses and Pipes category.

Technical Support and Cooling System Operation

When selecting a water hose for your BMW F10, F11, or F13, it's worth paying attention to the overall condition of the cooling system – radiator, fans, expansion tank, and other hoses. High summer temperatures particularly stress this area, so regular checks and replacement of worn parts directly impact engine longevity.

To better understand how thermal conditions affect the entire cooling system and when it's worth considering the installation of used components, read the guide Summer Heat vs. Cooling System: Used Radiators and Fans Guarantee Savings, which will help you plan informed service maintenance for your BMW.