Radiator Hose BMW E81 E87 E90 E91 E92 N52 N52N Engine Feed Top Pipe Petrol

Radiator Hose BMW E81 E87 E90 E91 E92 N52 N52N Engine Feed Top Pipe Petrol is a cooling system component designed for 1 and 3 series models (E81, E87, E90, E91, E92) with a petrol engine. Thanks to its factory geometry and fitment for the front engine bay area, it ensures stable coolant flow and proper integration with other system components.

Specifications and technical data

• SKU: 7531579-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 17127531579
• Substitutable numbers: 17127531579, 7531579
• Location on the vehicle: Front
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and compatibility

The hose is designed as the upper radiator feed pipe for N52 and N52N petrol engines, installed in the front of BMW E81, E87, E90, E91, and E92 series bodies. The construction matches the manufacturer's original design, which facilitates installation in place of the factory part and allows for maintaining proper coolant circulation throughout the system.

The item belongs to the Lines, hoses, and pipes group, responsible for transporting the working medium within the cooling system. Using a dedicated hose for a specific engine type minimizes the risk of leaks, stress, and collisions with other components in the engine bay.

Construction and function in the cooling system

The upper radiator hose plays a key role in discharging heated fluid from the engine to the radiator, where it is cooled. The properly selected shape and internal diameter of the hose ensure:

• stable coolant flow under typical N52/N52N engine loads,
• proper positioning in the front of the engine bay,
• reduction of vibrations and stresses resulting from engine operation and temperature changes.

Thanks to its fitment for the specific petrol powertrain configuration, the hose works with engine and radiator connectors without the need for modifications, which promotes trouble-free service replacement.

Application in service practice

Replacing the upper radiator hose is recommended when there are visible signs of wear, cracks, deformations, or after detecting cooling system leaks. Using a hose dedicated to the N52/N52N petrol engine allows you to:

• maintain proper pressure in the cooling system,
• reduce the risk of engine overheating,
• ensure correct cooperation with other lines, hoses, and pipes in the front zone of the vehicle.

The part is suitable for both standard maintenance replacement and broader work within the engine bay, where restoring factory flow and system tightness is required.

Product characteristics and condition

The hose comes from the BMW range, which means it maintains original geometry, mounting points, and compatibility with factory brackets and clamps. The used nature of the part allows for an economical restoration of cooling system efficiency while maintaining compliance with the manufacturer's design.

Selecting the right element is facilitated by the manufacturer's markings and assignment to a specific fuel type – in this case, petrol units – which is important when distinguishing between hoses used in different engine variants.

System expansion – related elements

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

When planning broader service work, it is also worth expanding your knowledge on selecting used components – the article describing practical aspects of purchasing parts from the secondary market may be helpful, available here: Used car parts – a way for style and savings.