Expansion Bottle BMW E81 E82 X1 E84 E87 E90 E91 E92 Tank Radiator Diesel 7810592

Expansion Bottle BMW E81 E82 X1 E84 E87 E90 E91 E92 Tank Radiator Diesel 7810592 is an original coolant expansion tank designed for a wide range of BMW models with diesel engines. This component is responsible for maintaining a stable coolant level, which is crucial for the safe operation of the engine. Thanks to its factory design, the tank ensures proper cooperation with the radiator and the entire cooling system, without the need for modifications.

Specifications and technical data

• SKU: 8570079-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8570079
• Substitutable numbers: 17138570079, 8570079, 17137800291 17137520719 17134714830, 7800291 7520719 4714830, 17137804890 17137801214 17137810592, 7804890 7801214 7810592
• Fuel type: Diesel
• Category: Expansion & Overflow Tanks

Purpose and Compatibility

The presented expansion tank is dedicated to popular BMW 1 Series, 3 Series, and X1 models with Diesel engines. The design has been developed for the specific cooling systems of these units, which translates into proper hose routing, appropriate mounting points, and correct interaction with sensors and the pressure cap. This ensures a predictable installation process, and after installation, the system behaves according to factory specifications.

Construction and Function in the Cooling System

The expansion tank from the Expansion Tanks category acts as a buffer for the coolant, compensating for volume changes due to temperature fluctuations. The appropriately shaped housing allows for:

• maintaining a stable fluid level across the entire engine operating temperature range,
• proper bleeding of the cooling system,
• cooperation with the factory coolant level sensor (if present in the specific vehicle configuration),
• safe release of excess pressure through the cap.

An element designed in this way allows for maintaining the proper thermal parameters of the engine, which is important for both engine durability and driving comfort.

Benefits of Using an Original BMW Tank

Using an original BMW expansion tank offers a number of practical benefits compared to aftermarket replacements of unknown origin. The most important include:

• Factory Fitment – compatibility with mounting points, hose connector diameters, and engine bay geometry, which facilitates installation and eliminates the need for modifications.
• Predictable cooling system operation – maintaining pressure and coolant flow parameters according to the vehicle manufacturer's specifications.
• Consistency with other system components – radiator, hoses, thermostat, and diesel engine accessories.

Thanks to this, replacing a worn or leaking tank with an original part restores the correct operating conditions of the cooling system, which is particularly important in diesel engines, which are sensitive to overheating.

Condition, Origin, and Service Application

The offered BMW expansion tank comes from a dismantled vehicle and is a used part, making it an attractive solution for users looking for technically sound parts at a reasonable price. This type of component is ideal for both standard cooling system repairs and comprehensive service when several parts need to be replaced simultaneously. Thanks to the preservation of the original design, it is possible to quickly bleed the system after installation and easily check the fluid level during daily operation.

Technical Support and Additional Information

When upgrading or repairing the cooling system in BMW diesel vehicles, it is worth paying attention to the tank's compatibility with the specific body version and engine unit. Original manufacturer markings and available replacement numbers facilitate correct part identification and selection of the appropriate element for a given vehicle. If you are planning a broader range of work on your BMW cooling system and need other parts from this group, check the available parts in the BMW Expansion Tanks category.

If you are considering more extensive car modifications and want to combine repairs with performance improvements while staying within a reasonable budget, it is worth familiarizing yourself with practical tips on using used components – you will find them in the article Tuning with Used Parts – How to Gain Performance Without Losing a Fortune, which discusses a safe and effective approach to such modifications.