BMW E81 E87 E90 E92 Expansion Tank Bottle Coolant Radiator Tank Diesel 8570079

BMW E81 E87 E90 E92 Coolant Expansion Tank is an original cooling system component from the Expansion Tanks category, designed for BMW cars with diesel engines. It ensures stable operation of the cooling system, proper fluid volume compensation, and safe pressure relief, which is crucial for the durability of the powertrain.

Specifications and technical data

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

Purpose and Role in the Cooling System

The presented expansion tank is a cooling system component dedicated to BMW models series E81, E87, E90, and E92 with diesel engines. It is responsible for compensating for changes in coolant volume, stabilizing pressure, and allowing for easy fluid level checks. A correctly chosen tank helps maintain optimal engine operating temperature, which translates to its lifespan and operational safety.

Construction and Performance Parameters

The BMW Coolant Expansion Tank is designed as a component that works with the factory cooling system, featuring appropriately shaped connection spigots and a space for the pressure cap. The construction ensures:

• adequate working capacity tailored to the cooling system in diesel engines,
• proper routing of cooling hoses and pipes,
• the ability to visually check the fluid level,
• stable operation under typical thermal loads of the powertrain.

By maintaining the factory geometry and mounting points, installation is straightforward, without the need for modifications to the system.

Compatibility and Replacement Numbers

The offered tank is a BMW part, prepared to work with diesel engines. It has an assigned OEM part number and a set of replacement numbers, which facilitates verification of compatibility with a specific engine version and vehicle year. Before purchasing, it is advisable to compare the markings with your vehicle's data or use the manufacturer's catalog to confirm full compatibility.

Condition and Benefits of Use

The item is offered as a used part, allowing for an economical repair of the cooling system while maintaining characteristics close to the original. Using an original expansion tank helps to:

• maintain correct pressure in the cooling system,
• minimize the risk of engine overheating,
• ensure proper circulation and bleeding of the coolant,
• maintain the correct arrangement of hoses and accessories in the engine bay.

For vehicles with higher mileage, replacing the expansion tank is often a preventative maintenance measure, reducing the risk of failures due to leaks or material fatigue.

Selection and Additional Information

When selecting this component, it is advisable to use the manufacturer's markings and fuel type information to avoid mistakes between engine versions. If in doubt, comparing the shape, spigot arrangement, and mounting method with the currently installed tank in your vehicle may be helpful.

If you are looking for other BMW expansion tanks, check out our dedicated category: BMW expansion tanks.

When planning major repairs to the powertrain, it is worth familiarizing yourself with practical tips regarding the used parts market – a guide will be helpful: how to buy a used engine for a car and avoid pitfalls.