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

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

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

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

BMW G20 G21 M340dX XD5T Bare Engine B57D30B 340HP with 21k miles, WARRANTY is a used, factory-spec engine block from the BMW engine family, designed for installation in the sports variants of the 3 Series. This solution is for users who are looking for a high-performance, six-cylinder engine with great potential and want to maintain full compatibility with the vehicle's design. The bare engine block serves as a solid foundation for further assembly with accessories that meet the requirements of a specific vehicle configuration.

Specifications and technical data

• SKU: 5A3CD08
• 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 engine block

The presented engine block belongs to the Engines category and represents a modern BMW design from the B57 family. The use of six cylinders in an inline configuration ensures high refinement, smooth power delivery, and the flexibility characteristic of this brand. The unit was designed with dynamic driving in mind, typical of the M340dX version, while maintaining reasonable fuel efficiency.

A bare engine block means that you receive the base engine component, prepared for the transfer or installation of accessories according to the requirements of a specific vehicle. This solution is particularly beneficial for professional repairs, where the ability to use existing components and full control over the unit's configuration are essential.

Purpose and application in the BMW 3 Series

The B57D30B engine code is used in the sports variants of the G20/G21 generation BMW 3 Series, including the M340dX versions and related drivetrain configurations. The design of this unit was developed to combine high power with everyday driving comfort, making it an attractive base for both repairs and upgrade projects within this platform.

In practice, this means that the engine block will perform well wherever it is required to maintain the original engine operating characteristics, compatibility with factory electronics, and the drivetrain. The six-cylinder architecture promotes smooth torque delivery, which is particularly noticeable during dynamic acceleration and highway driving.

Benefits of choosing a used engine block

Choosing a used engine block from the B57 family is a solution that allows you to significantly reduce costs compared to purchasing a complete, new unit, while maintaining a high level of technical compliance. This type of component is often chosen by workshops specializing in the BMW brand because it allows for:

• maintaining the original engine specification in the vehicle,
• flexible adjustment of accessories to the specific configuration of the car,
• control over the scope of repair and upgrade work,
• optimization of repair costs while maintaining the factory design base.

An additional advantage is the possibility of using existing, functional accessory components, which allows for precise adjustment of the final configuration to the user's expectations and the specifics of a given BMW vehicle.

Condition, mileage, and operational potential

The offered engine block is a used item, which in practice means that it has already undergone a certain stage of operation, but still serves as a valuable base for further use after proper installation and configuration. The declared mileage of the unit is relatively low for this class of engine, which translates into favorable potential for further operation with proper maintenance.

Before installation, standard inspection procedures by the workshop are recommended, such as verifying tightness, checking the condition of cooperating elements, and preparing the unit for operation with the existing lubrication and cooling system. This allows you to fully utilize the design capabilities of the six-cylinder BMW engine and minimize the risk of unplanned vehicle downtime.

BMW Engines – additional information and project development

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

When planning larger investments in the powertrain, it is also worth learning about the typical weak points of selected engine series of this brand. Practical tips regarding problematic units and potential repair costs can be found in the article: Troublesome BMW E90 engines: check what can ruin your budget!

If you are interested in a broader context of the differences between standard components and solutions from the M and M Performance lines, the following material may also be helpful: BMW M Performance: how do BMW M components differ from standard ones?