BMW G20 G21 M340dX XD5T Complete Engine B57D30B 340HP with 21k miles, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

BMW G20 G21 M340dX XD5T Complete Engine B57D30B 340HP with 21k miles, WARRANTY is a complete powertrain from the BMW six-cylinder engine family, designed for installation in modern 3 Series models. A used engine from this series is a solution for drivers who expect high operational refinement, powerful acceleration, and seamless integration with the vehicle's advanced electronics. Thanks to its factory configuration, this unit serves as a foundation for professional repair or replacement in premium-class vehicles.

Specifications and technical data

• SKU: 5A3CD08-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5A3CD08
• Substitutable numbers: 5A3CD08, 11005A3CD08
• Fuel type: Petrol
• Number of cylinders: 6
• Category: Engines
• Engine code: B57D30B
• Mileage: 21 000

Technical characteristics of the powertrain

The B57D30B engine belongs to the modern generation of BMW inline six-cylinder units, designed for dynamic driving and stable operation under a wide range of loads. The cylinder configuration promotes vibration balance, which translates into smooth powertrain operation and acoustic comfort inside the vehicle.

The unit has been developed to work with advanced engine management systems typical of the new generation of BMW 3 Series. Properly selected combustion parameters and modern block architecture allow for efficient power utilization while maintaining predictable torque characteristics.

Application in BMW G20 / G21 M340dX XD5T

The presented complete engine is intended for BMW G20 and G21 models in the M340dX XD5T version, where it acts as the central element of the powertrain. The unit's construction has been adapted to work with all-wheel drive and a sport-tuned suspension, which allows for the utilization of the full 340 HP power potential in daily use and during dynamic driving.

An engine from this series is a popular choice for professional post-accident repairs, engine replacements after failure, and modernization projects where maintaining the manufacturer's original specification is crucial. As a result, it provides a consistent service solution for workshops specializing in the BMW brand.

Benefits of choosing a complete BMW engine

Choosing a complete engine from the B57 family for the BMW G20/G21 M340dX XD5T allows for reduced vehicle downtime and simplifies the installation process. The unit is configured as a whole, which facilitates matching it to the existing vehicle installation and minimizes the risk of component incompatibility.

The main advantages of such a solution include:

• maintaining the original engine performance characteristics intended for the M340dX XD5T version,
• the ability to restore the vehicle's factory performance,
• easier diagnostics and control configuration compared to units with different specifications,
• consistency with the drivetrain and driver assistance systems.

Additionally, the six-cylinder design promotes even loading of mechanical components, which, with proper maintenance, can translate into stable operation over a long period of use.

Condition, mileage, and operational potential

The engine comes from the Engines category and is offered as a used item, which allows for significant repair cost savings compared to brand-new units. The declared mileage is low for this class of component, which increases its potential for further operation when following appropriate assembly and service procedures.

Before installation, standard preparatory steps are recommended, such as checking accessories, replacing consumables, and verifying the tightness of cooperating systems. This approach allows for maximizing the durability reserve of the unit and reducing the risk of unplanned vehicle downtime after replacement.

Fitment, diagnostics, and service knowledge

When selecting a powertrain for a specific BMW 3 Series vehicle, it is crucial to verify the compatibility of the engine code and accessory configuration with both the donor and recipient vehicles. Proper matching of control parameters, fuel type, and fuel system architecture has a direct impact on the correct operation of the entire powertrain.

If you are interested in a broader context of BMW engine durability and want to better understand how to avoid costly failures, it is worth checking out our guide: Troublesome BMW E90 engines – a practical guide to problematic units. Knowledge from such materials helps in consciously planning service and operation even in newer models.

If you are planning a comprehensive repair or modernization of the engine area in your BMW and need other components from the same group, such as blocks, cylinder heads, or complete powertrains, check out the available parts in the BMW Engines category.