Oil Cooler Pipe BMW F20 F21 F22 M135i M235i N55 Gearbox Hose Line 7626316

Oil Cooler Pipe BMW F20 F21 F22 M135i M235i N55 Gearbox Hose Line is an original component from the Oil coolers and pipes group, designed for automatic transmission systems in BMW F-series petrol vehicles. It ensures stable transmission oil flow between the gearbox and the cooling system, which translates into safe drivetrain operation and predictable vehicle performance. This solution is dedicated to the M135i and M235i versions with the N55 engine, designed to meet the specific thermal requirements of these units.

Specifications and technical data

• SKU: 7626316
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7626316
• Substitutable numbers: 7626316, 17227626316
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Oil Coolers & Lines

Purpose and function in the drivetrain

The gearbox oil pipe in this BMW model is responsible for the controlled flow of transmission oil between the automatic gearbox and the cooling components. In vehicles with the N55 petrol engine, especially in the M135i and M235i versions, the drivetrain operates under higher thermal loads, which is why proper oil circulation is crucial for maintaining a stable operating temperature.

This component works with the oil cooling system, reducing the risk of automatic transmission overheating during dynamic driving, highway travel, or intense acceleration. As a result, the gearbox maintains predictable gear shifting characteristics, and its mechanical components are better protected against excessive wear.

Benefits of using an original oil pipe

Using a pipe dedicated to specific BMW F-series models with the N55 engine and automatic transmission ensures:

• Precise geometric fit to the factory mounting points on the body and the gearbox.
• Optimally selected diameter and internal cross-section, supporting correct oil pressure and flow.
• Compatibility with the factory oil cooling system, without the need for installation modifications.
• Consistency with BMW factory standards regarding temperature and operating pressure resistance.

For the user, this means more predictable operation of the automatic transmission, reduced risk of leaks, and easier diagnostics in the event of potential faults in the oil cooling system area.

Application in petrol vehicles with an automatic transmission

The pipe has been designed for petrol-powered vehicles where the automatic transmission works with the turbocharged N55 engine. This drivetrain configuration generates higher thermal loads than in naturally aspirated units, which is why a stable transmission oil circuit is particularly important for maintaining the gearbox's performance and durability.

In practice, a properly functioning gearbox oil pipe helps maintain:

• smooth and repeatable gear shifts across a wide temperature range,
• better protection of clutch discs and hydraulic components,
• greater system resistance to intense use typical of the M135i and M235i versions.

Integration with the oil cooling system

As an element from the Oil coolers and pipes group, this pipe helps form the oil circuit responsible for dissipating excess heat from the automatic transmission. Proper routing of the working medium to the oil cooler allows for stable transmission operating parameters, which is important for both driving comfort and component longevity.

If you want to better understand the impact of temperature on the cooling system and components responsible for heat dissipation, it is worth reading the guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings, which describes the practical aspects of operating used cooling components.

Support with selection and related components

In the case of service work on the automatic transmission in a BMW F-series, knowledge about typical faults and methods for assessing the condition of used components may also be helpful. Extended information on this topic can be found in the article Gearbox: manual, automatic or DSG – typical faults and a guide to buying a used gearbox, which discusses the practical aspects of operating and selecting transmission components.

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