BMW E81 E87 E90 E91 E92 Petrol Hose From Engine Radiator Top 7531579

BMW E81 E87 E90 E91 E92 Petrol Hose From Engine Radiator Top is an original cooling system component from the Hoses, pipes and tubes group, designed for installation in the front section of BMW vehicles with petrol engines. This used OEM part ensures factory-spec geometric fitment, the correct flow diameter, and compatibility with the connectors and fittings used in these models.

Specifications and technical data

• SKU: 7531579
• 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 function in the cooling system

The water hose used in BMW E8x and E9x series models is responsible for the controlled flow of coolant between components in the front section of the vehicle. A correctly selected hose section minimizes the risk of leaks, pressure loss, and engine overheating, which directly impacts the durability of the petrol engine.

Thanks to a design that adheres to factory BMW standards, the hose maintains appropriate rigidity and flexibility within typical operating temperature ranges, and its shape is tailored for routing in the engine bay without colliding with other components.

Construction and fitment for BMW

The water hose in question belongs to a group of components that must be precisely matched to the specific architecture of the BMW engine bay. This includes:

• properly formed geometry of bends and curves,
• internal diameter matched to the cooling system connectors,
• routing in the front zone of the vehicle designed for factory clamps and mounts.

Such fitment translates into stable positioning of the hose, reduced vibrations, and lower mechanical stress during engine operation, which promotes a longer service life for the component.

Operational characteristics in petrol engines

In BMW petrol units, the cooling system operates across a wide temperature range, and the water hose must maintain a seal during both cold starts and high thermal loads. Using the original geometry and material of the hose helps maintain:

• stable coolant flow in the front part of the system,
• proper operating pressure in the circuit,
• correct interaction with the radiator and other hoses.

This reduces the risk of localized overheating, decreased cooling efficiency, and failures resulting from leaks or hose kinks.

Condition, installation, and service application

The item is offered as a used part, which allows for an economical replacement of a damaged or leaking section of the cooling system while maintaining the factory character of the installation. In practice, this type of hose is most commonly used during:

• repairing coolant leaks in the front part of the vehicle,
• post-collision repairs involving the radiator area,
• preventive replacement of worn or brittle hoses.

When correctly matched to the specific body and engine version, installation involves removing old clamps, cleaning the connectors, and seating the hose in the existing mounting points.

Compatible BMW Hoses, pipes and tubes and service knowledge

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 additional coolant lines, flexible hoses, or rigid fluid pipes, check the available parts in the BMW Hoses, pipes and tubes category.

If you are simultaneously servicing the braking system and want to approach the purchase of used components consciously, a useful supplement to your knowledge would be the article Second-hand braking system: how to safely choose discs, calipers, and ABS?, where you will find a practical checklist that is also useful when assessing the condition of other used components.