BMW E60 E61 E90 E91 M57N2 Turbocharger Return Hose Pipe 7804257

BMW E60 E61 E90 E91 M57N2 Turbocharger Return Hose Pipe is an original turbocharging system component from the Lines, hoses and pipes group, designed for BMW diesel engines from the M57N2 family. It ensures controlled oil return from the turbocharger to the lubrication system, which translates into stable engine operation and reduces the risk of leaks.

Specifications and technical data

• SKU: 7804257-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7804257
• Substitutable numbers: 11427804257, 7804257, 11427794316, 7794316
• Part type: Pipe
• Category: Hoses, Lines & Pipes

Purpose and function in the turbocharging system

The turbocharger return hose in the M57N2 engine is responsible for draining lubricating oil from the turbine housing back to the engine. A correctly selected and leak-free component:

• stabilizes oil pressure within the turbocharger,
• minimizes the risk of oil entering the intake or exhaust system,
• limits the possibility of turbine bearing overheating,
• supports long-term, consistent operation of the M57N2 unit under typical road conditions and higher loads. Thanks to its factory geometry and fitment for specific BMW 5 Series E60/E61 and 3 Series E90/E91 models, the hose maintains proper routing in the engine bay and works with original mounting points.

Advantages of using an original BMW hose

Using an original turbocharger return hose in the M57N2 engine provides a number of practical operational benefits:

• Factory fitment – the component comes from the BMW line, which translates into compatibility with the lubrication system and turbocharger used in the given engine variant.
• Stable turbocharger operation – proper oil flow reduces the risk of bearing seizure and premature turbine wear.
• Leak reduction – a properly shaped hose with matched ends makes it easier to maintain system tightness.
• Hassle-free integration with the existing installation – no need for modifications, custom mounts, or changing the hose routing.

Characteristics of the used component

The offered hose is a used component, sourced from a dismantled BMW vehicle. In many cases, this type of part allows for a significant reduction in repair costs compared to purchasing a new component, while maintaining the manufacturer's original specifications. This type of hose is a particularly attractive solution when:

• fixing leaks in the turbocharger area,
• performing comprehensive turbocharging system maintenance after a turbine failure,
• carrying out repairs on high-mileage vehicles where a reasonable balance between cost and functionality is important.

Compatibility with the M57N2 engine

The hose has been designed to work with the M57N2 power unit used in the BMW 5 Series E60/E61 and 3 Series E90/E91. This means that the geometry, connection diameters, and hose routing are adapted to the factory lubrication system and turbocharger in these models. In practice, this translates into:

• easier installation in workshop conditions,
• maintaining the original hose routing in the engine bay,
• no collisions with other engine accessory components. 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, cooling system hoses, or vacuum pipes, check out the available parts in the BMW Lines, hoses and pipes category.

Support with selection and additional information

When selecting a turbocharger return hose for a specific version of a BMW with an M57N2 engine, it is crucial to verify compatibility with the engine code and vehicle year. In case of doubt, it is worth comparing the shape and type of connections with the component currently installed in the car or seeking help from a specialized workshop. If you are interested in a broader context of cost-effective repairs using dismantled parts and want to better understand how used components affect driving comfort and steering precision, read the article: Knocking in the suspension? Discover a clever way to restore factory steering precision without spending a fortune at the service center.