BMW G20 G21 320e 330e G30 LCI 520e 530e B48X Bare Engine B48B20A 7k, 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 320e 330e G30 LCI 520e 530e B48X Bare Engine B48B20A 7k, WARRANTY is a used, complete bare engine block from the modern BMW gasoline unit family, designed for 3 and 5 Series plug-in hybrid models. With a design based on the B48X series four-cylinder gasoline engine, it provides a solid foundation for professional repair or powertrain conversion. This is a solution for users expecting consistency with factory BMW architecture and precise fitment for dedicated models.

Specifications and technical data

• SKU: 5A078D7
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5A078D7
• Substitutable numbers: 5A078D7, 11005A078D7, 5A078D5, 11005A078D5
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Engine code: B48B20B
• Mileage: 7 000

Technical characteristics of the B48X engine block

The presented bare engine block belongs to the family of modern BMW B48X gasoline units used in hybrid variants of the 3 Series G20/G21 and 5 Series G30 LCI. The four-cylinder design ensures a compact build, favorable weight distribution, and high refinement, which is particularly important in premium class vehicles. The engine code B48B20B denotes a unit from the BMW modular engine family, designed to work with the electrical system in 320e, 330e, 520e, and 530e versions.

The bare engine block is intended for further assembly with accessories compatible with the specific vehicle configuration. This form allows for the transfer of existing accessories from a damaged unit or the use of individually selected components, while maintaining full compatibility with factory electronics and control systems.

Application in BMW G20, G21, and G30 LCI models

The B48X family engine was developed for modern BMW 3 and 5 Series platforms, particularly for plug-in hybrid versions. As a result, the engine block is structurally prepared to work with:

• the high-voltage system used in 320e, 330e, 520e, and 530e variants,
• integrated combustion-electric drive control,
• modern automatic transmissions used in G20/G21 and G30 LCI platforms.

Such compatibility allows for the maintenance of factory operating parameters, correct communication with control modules, and full integration with safety and comfort systems. For workshops specializing in the BMW brand, this means the ability to perform repairs in a manner consistent with manufacturer standards, maintaining the integrity of the entire powertrain.

Benefits of using a bare engine block

Choosing a bare engine block from the B48X family for BMW G20, G21, and G30 LCI models offers a range of practical service and operational benefits:

• Configuration flexibility – the ability to use existing accessories or install components selected for a specific vehicle specification.
• Consistency with factory design – the block comes from the same engine family as the units originally installed in the 320e, 330e, 520e, and 530e.
• Reduced interference with the electrical installation – preservation of the original control system and vehicle wiring harnesses.
• Possibility of professional accessory refurbishment based on a verified block and cylinder head.

Additionally, using a unit from the B48X family in BMW hybrid models allows for maintaining proper operating parameters of the energy recovery system, start-stop systems, and driving modes that combine combustion and electric power.

Condition, mileage, and serviceability

The engine is offered as a used bare block, meaning it serves as a base for further assembly and configuration according to the requirements of a specific vehicle. The low mileage of the unit translates into limited wear of base components such as the block, cylinder head, or crankshaft assembly, which is important when planning long-term operation after repair. This type of block is particularly useful in situations where there has been serious mechanical damage to the engine in the vehicle, and repairing the existing unit is uneconomical or technically difficult.

For workshops specializing in the BMW brand, a used B48X family block is a cost-effective solution that allows for restoring vehicle functionality while maintaining a high level of compliance with factory design standards.

Technical recommendations and additional materials

When planning an engine replacement in modern BMW models, it is worth considering experiences from previous generations. For a comparison of typical operational issues and repair costs in older models, an article discussing critical units in the E90 series may be helpful – you can find it here: Faulty BMW E90 engines – a practical guide to problematic units. It helps to better understand how proper engine selection and maintenance affect the user's budget in the long term.

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 complete power units, check the available parts in the BMW Engines category.