BMW 1 3 Series F20 F21 F30 F31 LCI B47 Diesel Transmission Oil Cooling Hose

BMW 1 3 Series F20 F21 F30 F31 LCI B47 Diesel Transmission Oil Cooling Hose is an original oil cooling system component designed for modern BMW diesel engines. Thanks to its factory geometry and precisely selected diameters, it ensures stable heat dissipation from the engine oil, which translates into safe operation and durability of the diesel engine. This is a practical solution for users who want to maintain consistency with factory specifications and avoid issues with fitting aftermarket replacements.

Specifications and technical data

• SKU: 8518749
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8518749
• Substitutable numbers: 11538518749, 8518749, EM
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the oil cooling system

The presented hose is a component of the system that transports oil between the cooler and other engine parts in BMW F-series models with F20, F21, F30, and F31 bodies after the LCI facelift. It is responsible for stable oil flow under pressure, which is crucial for maintaining the proper operating temperature of the diesel power unit.

A properly selected oil cooler hose:

• reduces the risk of oil overheating under high engine load,
• supports the maintenance of proper oil viscosity across a wide temperature range,
• reduces thermal stress on lubricated components, such as bearings or the turbocharger,
• ensures predictable behavior of the lubrication system in both city and highway driving conditions.

Compatibility with BMW diesel engines

The hose has been designed with diesel units in mind, which is why its construction accounts for the specific operating characteristics of diesel engines – higher torque, frequent long-term loads, and increased requirements for oil cooling. As a result, it serves as a cohesive element of the lubrication and cooling system in modern BMW designs.

Selecting the right hose for a specific engine version is important not only for installation but also for operational safety. If you have any doubts regarding the diagnostics of a diesel unit, it is worth checking out the educational material on common diesel injector faults and their consequences, which helps to better understand the connections between the fuel supply, lubrication, and cooling systems.

Design characteristics and installation

As an element from the Lines, hoses, and pipes group, the oil cooler hose has been developed to maintain factory routing in the engine bay and provide appropriate resistance to temperature and operating pressure. The shape, length, and connection diameters are adapted to the architecture of BMW F20, F21, F30, and F31 LCI units, which facilitates installation without the need for modifications.

When replacing, it is worth paying attention to:

• the cleanliness of connection ports and seals,
• the absence of kinks or twists in the hose after installation,
• proper positioning relative to other components to avoid chafing,
• checking for leaks after the first engine start.

Part condition and service application

The offered hose is a used part, which makes it a reasonable choice for service repairs when the priority is to maintain original specifications while optimizing costs. Such components are particularly useful for:

• fixing oil leaks around the cooler or hoses,
• repairs following mechanical damage to the front of the vehicle,
• preventive replacement of rubber and flexible elements in older vehicles.

Using an original hose reduces the risk of fitment issues that can occur with imprecise aftermarket replacements and facilitates subsequent diagnostics of any potential leaks.

Support with selection and further system upgrades

If you are planning comprehensive maintenance of the oil cooling system or are looking for other elements from this group, it is worth browsing other products in the Lines, hoses, and pipes category to select a consistent set of components. This makes it easier to maintain a uniform standard of parts in the vehicle and promotes predictable operation.

Additionally, we encourage you to read our guide materials, such as the practical guide to the operation and diagnostics of diesel engine systems, which help to better plan service work and understand the impact of the oil cooling system's condition on the engine's lifespan.