Overview
BMW cooling systems require stable coolant volume control.
For this reason, this expansion tank supports thermal balance in BMW X6 models.
The design manages coolant expansion during temperature changes.
As a result, engine cooling remains consistent during daily and extended operation.
Vehicle Compatibility and Applications
BMW applies this expansion tank on X6 vehicles built on the E71 and E72 platforms.
These models entered production between 2008 and 2014.
Moreover, BMW paired this tank with six-cylinder and eight-cylinder engines.
Engine displacements typically range from 3.0L to 4.4L.
In addition, the cooling layout matches other BMW large SUV platforms of the same era.
Material and Structural Design
The design uses high-grade heat-resistant plastic.
Therefore, the housing maintains shape under continuous thermal exposure.
The exterior surface resists coolant contact and engine bay contamination.
At the same time, uniform wall thickness improves pressure stability.
This structure supports long-term dimensional accuracy.
Cooling Stability and System Protection
Coolant expansion creates pressure changes inside the system.
For this reason, the tank stabilizes internal coolant volume.
As a result, hoses and connectors experience lower stress.
Moreover, clear external level markings support fast visual inspection.
This feature improves service efficiency during routine checks.
OE Reference Integration
BMW assigns OE number 16127236941 to this expansion tank.
In addition, BMW also uses reference 17137640514 for compatible systems.
These OE numbers confirm application across multiple X6 engine variants.
However, technicians should always verify vehicle configuration before installation.
Maintenance and Replacement Guidance
Cooling system components age under heat exposure.
Therefore, technicians inspect expansion tanks during scheduled service.
Cracks, discoloration, or deformation indicate replacement needs.
As a result, timely replacement reduces overheating risk.
BMW service schedules provide the recommended inspection intervals.
Installation and Fitment Notes
This expansion tank fits original BMW mounting locations.
Moreover, the design follows factory hose routing.
No modification to surrounding components is required.
Consequently, installation remains straightforward for professional technicians.
