BMW 3 Series E90 E91 320d M47N2 Oil Cooling Pipe Inlet And Outlet Hose 7804145

BMW 3 Series E90 E91 320d M47N2 Oil Cooling Pipe Inlet And Outlet Hose is an original lubrication system component designed for the M47N2 engine in the 3 Series E90/E91. This used hose allows for an economical yet technically sound repair of the oil cooling system, maintaining the factory-specified routing geometry and compatibility with other components. It is a practical solution for users who want to restore the proper operation of the power unit without compromising on fitment.

Specifications and technical data

• SKU: 7804145
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7804145
• Substitutable numbers: 17227804146, 7804146, 17227789597, 7789597, 17227800493, 7800493, 17227804145, 7804145, 17227789596, 7789596, 17227800492, 7800492, EM
• Category: Engine Oil Coolers & Lines

Purpose and function in the oil cooling system

The oil cooling hose in the M47N2 engine is responsible for the stable flow of oil between key elements of the lubrication and cooling system. A properly selected component:

• ensures the correct pressure and direction of the operating oil flow,
• reduces the risk of oil overheating under engine load,
• minimizes the possibility of leaks at connections thanks to its factory geometry,
• supports the maintenance of stable operating temperatures for the power unit.

By maintaining the original design, the hose works in harmony with the factory oil cooler and other system components, which translates into the cohesion of the entire lubrication system.

Technical category: Oil coolers and hoses

This item belongs to the Oil coolers and hoses group, which consists of components responsible for controlling engine oil temperature. Replacing the hose is particularly important in situations where:

• traces of corrosion or mechanical damage appear on the surface,
• oil leaks occur in the vicinity of the hose connections,
• the oil cooling system has been depressurized following a collision or service intervention.

Selecting a used, original hose from the same component group allows for maintaining factory operating parameters and reducing repair costs compared to purchasing a new part.

Benefits of using an original BMW hose

The original BMW oil cooling hose provides a number of practical advantages in daily operation:

• Factory fitment – the original length, shape, and mounting points are preserved, which facilitates installation and eliminates the need for modifications.
• Consistency with other system elements – the hose works with standard connectors, the oil cooler, and the engine block.
• Economical repair – a used OEM component allows for reduced service costs while maintaining high manufacturing quality.
• Diagnostic support – clear part identification via OEM and replacement numbers facilitates selection in service catalogs.

As a result, the hose is a sensible choice for users who expect reliable and predictable oil cooling system performance in their BMW 3 Series with an M47N2 engine.

Used condition and installation aspects

The item is offered in used condition, which allows for a favorable balance between purchase cost and adherence to the manufacturer's original specifications. Before installation, a standard service procedure is recommended, including:

• verification of the hose and connection ports for leaks,
• inspection of the surface for mechanical damage,
• replacement of seals and washers, if required by service documentation.

A properly installed hose restores correct oil circulation in the system, which has a direct impact on engine durability and the stability of its operating parameters.

Technical support and additional information

In the case of intensive operation in high temperatures, it is worth paying special attention to the condition of the entire cooling system. How seasonal thermal loads affect the operation of radiators, hoses, and fans, and how to reasonably use second-hand components, is described in the guide Summer heat vs. cooling system – used radiators and fans as a way to control service costs.

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 oil supply lines, return hoses, or additional sections connecting the cooler to the block, check the available parts in the BMW oil coolers and hoses category.