BMW E46 330i 330Ci M54 Complete Engine 306S3 M54B30 231HP 95k 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 E46 330i 330Ci M54 Complete Engine 306S3 M54B30 231HP 95k miles, WARRANTY is a verified, used powertrain unit from the M54 family, designed for the 3 Series E46 models in 330i and 330Ci versions. This is a six-cylinder, naturally aspirated petrol engine with high operating refinement, which works perfectly both as a replacement for repairs and as a base for further modifications. Thanks to the completeness of the accessories, it provides a convenient and technically consistent solution for major drivetrain work.

Specifications and technical data

• SKU: 7506890-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7506890
• Substitutable numbers: 7506890, 11007506890, 7506884, 11007506884, 11007506891, 7506891, 11007506885, 7506885
• Fuel type: Petrol
• Number of cylinders: 6
• Category: Engines
• Engine code: 306S3
• Mileage: 59 000

Technical characteristics of the M54B30 unit

The presented engine belongs to the esteemed M54 series, known for the smooth operation of the inline-six and predictable behavior under load. The petrol construction with six cylinders in an inline layout ensures a good balance between dynamics and driving comfort, which is particularly important in the 330i and 330Ci models. The engine code 306S3 allows for clear identification of the unit in service documentation and facilitates the selection of accessories and control systems.

The engine was designed as a modern, naturally aspirated petrol unit, responsive to the throttle and stable in higher RPM ranges. As a result, it fits perfectly into the sporty yet comfortable character of the BMW E46, offering the driver predictable acceleration and adequate power reserves when overtaking.

Application in BMW E46 330i and 330Ci

The offered complete engine is intended for use in BMW 330i E46 and BMW 330Ci E46 models, where it serves as the main powertrain unit. The M54B30 design is factory-matched to the drivetrain of these versions, which facilitates installation and reduces the need for modifications. The unit works well with both manual and automatic transmissions intended for this configuration.

The engine will work well as a replacement in the event of a failure of the previous unit, for post-accident repairs, or during a comprehensive vehicle restoration. Thanks to maintaining consistency with the original BMW specification, it is possible to maintain factory driving parameters and correct cooperation with the vehicle's electronics.

Condition, mileage, and benefits of purchasing a used engine

The unit comes from dismantling and is offered as a used complete engine, which allows for significant repair cost savings compared to purchasing a new replacement or rebuilding from scratch. The declared mileage is relatively low for this generation of engines, which in practice translates into the potential for long-term operation with proper service maintenance.

Purchasing a used M54B30 engine is a sensible solution for users who want to restore the full performance of their BMW E46 without overstretching their budget. An additional value is the preservation of the original inline-six operating characteristics, appreciated by many drivers for its sound and flexibility.

To better understand how to safely choose units from the secondary market, it is worth reading our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths. The article discusses selection procedures based on OEM numbers, common myths, and real cost savings.

Technical and installation aspects

The petrol engine with six cylinders in an inline layout ensures a compact, well-balanced construction, which facilitates installation work in the BMW E46 engine bay. The 306S3 code allows mechanics to quickly verify the unit's compatibility with a specific vehicle configuration, and the completeness of the engine reduces the need to search for additional accessory components.

When replacing the powertrain unit, standard service procedures are recommended, such as changing operating fluids, checking the cooling system, and verifying cooperating components (clutch, engine mounts, hoses). Such an approach increases the reliability of the entire drivetrain after installing a used engine.

BMW engines and ecology and cost-effectiveness

Choosing a used engine from dismantling is not only a financial saving but also a real contribution to reducing the carbon footprint. Reusing functional components reduces the demand for the production of new parts, which translates into lower consumption of raw materials and energy. You can find more on this topic in the article Sustainable automotive: How purchasing original used parts reduces the carbon footprint and protects the environment?, which describes in detail the impact of used components on the environment.

Related BMW Engines

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